method for controlling a rolling or sailing mode of a vehicle publication number DE102009028242 (A1)
Release date: 2011-02-10
Inventor: SAUTER INGO [DE]; Wuerthner MAIK [DE]; STAUDINGER JOACHIM [DE]; Kemler JOHANNES [DE] + (SAUTER, INGO; Wuerthner, Maik; STAUDINGER, JOACHIM; Kemler, JOHN)
Applicant: GEAR FRIEDRICHSHAFEN [ DE] + (ZF FRIEDRICHSHAFEN AG)
Classification:
International: B60W10/02; B60W10/10; B60W30/18; B60W40/10; F16D48/06
European:
Application number: 20,090,805 DE200910028242
Priority number (s): DE200910028242 20,090,805
The EPA is not responsible for the accuracy of data originating from other authorities than the EPO, and thus in particular not liable for their Completeness, timeliness or fitness for a particular purpose. Information, please refer to the respective patent authorities.
this text translated description of DE 102009028242 (A1)
[0001] The present invention relates to a method for controlling a rolling or sailing mode of a vehicle, for a powertrain with a drive motor, an automatic or automated gearboxes and controllable switching means interruption of the power circuit in the power train, according to the preamble of claim 1
[0002] The energy and cost savings and to reduce the environmental impact vehicles may, in appropriate situations in a roll-or sailing mode temporarily moved its propulsion. In particular, can be operated in a reduced consumption and emissions during idling of a motor vehicle in the roll mode of the internal combustion engine while the vehicle is rolling with an open driveline. If the combustion engine in such a situation driving off in order to increase the savings even more, the vehicle is moving in a so-called sailing mode. These functions are already known. can
[0003] The power circuit interruption, depending on the existing drive train components and gear type, by a circuit of the transmission in neutral and / or by opening a clutch, as soon as a rolling or sailing is possible. It has been shown that the known methods for the detection of suitable situations for the rolling or sailing mode, either due to a more unfiltered account of topography of the route and / or insufficient consideration of the current driving condition, interpret the driving situation is not always accurate or relatively complex and error prone, often unnecessary or undesirable for the driver's discretion and, if counterproductive neutral circuits or power interruptions can result in the final drive train.
[0004] DE 10 2007 001 936 A1 is a method for controlling a clutch of an automatic transmission of a motor vehicle, continuously at the detection of a mountain and a neutral idle control will be evaluated and tested. The process is carried out in order to neutral conditions of the combustion engine, for example when holding at signals or stop-and-go operation, in a neutral position of the gear to save fuel. In addition, should be prevented in a neutral circuit of the gearbox rear wheels of the vehicle on a slope because of too little braking pressure to hold the vehicle.
[0005] For such a neutral idle control, that is a situation controlled neutral circuit, certain entry conditions must be met, including an evaluation of a mountain detection flag and a mountain counter. A mountain-detection flag is set at an appropriate assessment based on the mountain or a mountain detection counter to be increased. This is the case when the transmission is in a forward gear, a transmission output speed is greater than a predetermined output speed limit, a throttle position of the engine is smaller than a predetermined throttle position limit, indicating a braking state that the vehicle brake is applied and the transmission temperature within an acceptable range is.
[0006] A rear roll-free neutral idle circuit can occur if, at a transmission output speed, which is smaller than the predetermined output speed limit, the current count less than a predetermined counter limit is or, for a count above this count limit if the brake pressure exceeds a pre-calculated braking pressure limit or if the brake pressure is not available and the count is greater than the count threshold, if a minor detection flag is set.
[0007] The known method used continuously recorded transmission, engine and brake data of the vehicle which, after a review of a counter reliable signals for expedient neutral circuits of the vehicle. A disadvantage of this is that the use of the procedure rather a stationary or nearly stationary vehicle limited, and therefore not readily transferable to the driving or the operation of the driver accelerator for rolling or sailing on planes or in the gap is. In particular, the triggering of a neutral circuit at such a ride in one is not prevented by the driver rather unfavorable driving conditions.
[0008] DE 102 21 701 A1 is a method for controlling a clutch of a motor vehicle with an automatic transmission is known. The clutch is opened, thereby interrupting the power circuit in the drive train when the engine is running and a minimum speed, an accelerator pedal or brake pedal or are not operated in their effect appropriate control variables. After opening the clutch is switched, the transmission in neutral, so that the vehicle is located in a rolling mode. After pressing the accelerator or the brake pedal or by changing their corresponding effect sizes, the coupling is closed and thus ended the roll mode. Before the closing of the first clutch, a speed of synchronization is the driving engine and a drive shaft of the transmission to stop the roll mode as convenient and fast. Furthermore, it is provided not to open the clutch and thus enable the roll mode when a need is identified by an expected vehicle deceleration. This can, in a quick throttle or when selecting a sports program to be the case.
[0009] A disadvantage of this is that not every time the vehicle is neither down nor drives the gas or brake pedal is pressed, a sailboard or roll mode is useful. In particular, remain in the process of forward-looking topography, traffic-vehicle or situational parameters considered rather inadequate. The speed sync when exiting the roll mode is especially designed for automatic transmissions. In addition, a combined sailing and rolling operation is not an operation of a cruise control or brake control system provided.
[0010] DE 10 2004 017 115 A1 is a method for automatic vehicle speed control- or cruise control and distance control for a vehicle with an automatic or automated transmissions are known in which can vary the speed in a selected set speed. It follows in each case on an acceleration phase, a coasting, in which the power circuit can be interrupted in the drive train in order to save fuel. In the sequence of acceleration and coasting to a navigation device obtained by means of topographic data, data from a monitoring device of the immediate area around the vehicle and / or vehicle parameters into account. The acceleration phases over a addition to an internal combustion engine using existing electric motor are supported.
[0011] The known method uses a sail or roll mode, the speed control within a speed control system in which a driver-specified desired speed is maintained or within an ACC (Adaptive Cruise Control) or ADR (Automatic Distance Regulation) - system, monitored by the sensors on the vehicle's environment is to adjust the distance to the preceding vehicle by automatically closing the throttle or braking means of a brake control system, is suitable. A disadvantage of this is that an independently controllable sail or roll mode is not provided. In particular, the neutral circuits and engine shutdown at the standards for cruise control or coupled with the brake control system. The possibilities of sailing or roll mode are thus limited.
[0012] WO 2003/037672 A1 is a stepped manual transmission, particularly for heavy commercial vehicles, announced that in recognition of a fuel-efficient car in neutral state, is thus connected in a rolling mode. A fuel-efficient driving condition is detected or the neutral position is then switched when a target speed is set and reduce the driving speed without roll mode would. This is especially accepted if neither gas nor brake pedal is pressed, or equivalent quantities change. For security reasons, an additional braking device available which can be requested during the rolling operation. In addition, the current gear is taken into account. A disadvantage of this is that a preliminary assessment of the roll mode is not likely intended, and unfavorable neutral circuits may be triggered.
[0013] Against this background, the invention aims to provide a process that allows for a vehicle with an automatic or automated transmissions a fuel-efficient and low-emission driving with an efficient, comfortable and reliable sailing or roll function.
[0014] The solution of this problem arises from the characteristics of the main claim, while advantageous embodiments and developments of the invention, the claims are removable.
[0015] The invention is based on the knowledge suppressed that in a vehicle with an automatic or automated transmission unnecessary neutral circuits when using a rolling or sailing function in driving or suitable conditions to activate these functions can be reliably detected when incidents or are driving state changes continuously registered and evaluated in a counter and, if highly variable slope signals are evaluated gewichtetet in a counter, and a current count is then used to release or blocking of the neutral circuits for the rolling or sailing mode is.
[0016] Accordingly, the invention is based on a method to control a rolling or sailing mode of a vehicle with a drive train with a drive motor, an automatic or automated gearboxes and controllable switching means for interrupting the power circuit in the drive train. To achieve the object, the invention provides that a power circuit interruption is released when the count of a rolling or sailing mode counter a predetermined first threshold value falls below or assumes the value zero, with the rolling or sailing mode counter the presence of at least incremented one in an event table stored event, that is incremented and decremented otherwise, So is counted down, or stopped.
[0017] A roll mode is driving a vehicle with an open drive line, ie a non-driven forward or Schwungnutzfahrt understood when the drive motor. In a sailing mode of operating a vehicle with an open driveline is understood when the drive motor.
[0018] The method according to the invention, the driving condition of the vehicle and the vehicle affecting topography in the way interpreted correctly, that unnecessary neutral circuits, ie neutral circuits without saving effect or without activation of the rolling or sailing mode undesirable for the driver or possibly security Situations can be avoided reliably.
[0019] The control measures may be advantageous over a transmission control unit that outputs the appropriate commands to initiate, conduct or completion of a rolling or sailing operation. Such a control device for this purpose with all sensors and necessity as far as necessity and with other control devices, such as the engine control unit, connected to receive the data and control commands the material forward. Principle be required for vehicles with a speed control system and / or a brake control system does not change the software on the controllers for these systems, which is cost impact.
[0020] Accordingly, in the process, a counter installed, which is incremented on relevant events in each case by a certain amount and is decremented when no such event exists. The increments, so then the individual Hochzählbeträge can be defined differently for different events. It is possible that is incremented once during an acting over time event, the counter when entering the event, or that the meter continuously from the recording of the event timing of a clock of a control unit, preferably the transmission control unit, as long as is incremented as the event is active. Here, the count is preferably limited to a predetermined maximum value.
[0021] The decrement is advantageous in the timing of the clock by a unit value per cycle. When the count has fallen below the decrementing a pre-determined threshold or reach zero, a power circuit interruption in the drive train, such as a shared neutral circuit in the transmission of the vehicle. The power circuit interruption in the drive train can also be done by opening a clutch, but it is irrelevant whether these are arranged separately from the transmission or part of the transmission.
[0022] Where the count however, when incrementing a second predetermined threshold value or the count is greater than the value zero, then a neutral circuit is not released.
[0023] By this counting method, a weighted continuous assessment of the current driving state is achieved, which represents the transmission control unit, a decision criterion for an effective and reliable use of the rolling or sailing function.
[0024] events, which increase the count to the operation of the accelerator pedal operated a neutral circuit of the transmission or an opening of the clutch in to suppress unfavorable situation for the driver are in a Event table stored. For example, the meter when you press the accelerator pedal, depending on the accelerator pedal angle and / or the deflection speed of the throttle or operating the brake pedal, brake pedal, depending on the angle and / or the deflection speed of the brake pedal can be incremented. Furthermore, the counter at an activated motor brake and / or increments for an activated additional braking device such as a hydrodynamic Intarder. In these situations, a neutral shift the driver's wish for a stronger and sustained acceleration or deceleration would be counter to earlier. Accordingly, in a currently detected acceleration or deceleration of the Vehicle, in which a predetermined threshold is exceeded, the circuit is not a neutral sense. Therefore, in this case, the count is increased. can
[0025] Furthermore, the count will be increased if a previously active cruise control or brake control system is switched off. The shutdown of such a device indicates that a traffic situation has changed such that an instantaneous activation of a rolling or sailing mode seems rather less useful. Perhaps that is there is a braking operation or a positive vehicle acceleration imminent.
[0026] In addition to steering movements exceeded a predetermined steering angle as Event parameters can be provided. Where an existing sensor has a relatively strong and / or frequent steering using fixed, the vehicle is likely to be either in city traffic or on a curved path, so that at very short roll would-or sailing phases alternating with braking and acceleration phases in quick succession which also does not make sense.
[0027] The operation of a direction indicator can be used as an additional event parameters, as is expected in this case, a turn or lane change, a rolling operation or sailing operation of the vehicle rather not make sense.
[0028] The operation of a hazard warning system or Hupanlage displays a safety car situation, such as the approach to a traffic jam or a vehicle breakdown or other emergency situation in which at least should be no automatic neutral circuit. Therefore, the counter is incremented in this case expediently.
[0029] The above event parameters represent only a selection of criteria that can be taken into account in the counter function and are stored in the event table. The expert will be able to complete the event table and modify further.
[0030] The sail or roll mode can be activated in principle, if the current road gradient a unpowered or a forward drive Schwungnutzfahrt possible.
[0031] As calculated to or via a conventional sensors in the driving covered slope signals in practice, however, noisy and / or may be masked by unwanted vibrations, is advantageously provided also that the feasibility of a power circuit interruption of the drive train while driving through a analysis of the road topography based on a continuously calculated and / or measured slope degree is assessed, a counter within a given elevation level window, which is defined by a first threshold for a mountain Directions and a second threshold for a downhill is dependent on the current elevation level variable is incremented or decremented, and is placed outside this elevation level window to an initial value.
[0032] Thus, two thresholds are set that represent a boundary slope, one value for slopes, the other value for slope. Within this boundary slopes can run the counter. Below or above the threshold, the count is initialized to a starting value.
[0033] In the counter will depend on the current slope of decrement or increment values different signals are read, which increase or decrease the count, so that the counter in a for the roll- and sailing mode pre-determined preferred maximum incline level quickly runs out. In order for this degree slope deviating strong signal fluctuations in a delay or suspension of a neutral circuit, as a result, irregularities and inaccuracies in the pitch signal, the recognition of the preferred disparities affect less.
[0034] In the transition from a slope into a steep gradient, which is designed for rolling or sailing mode is not more appropriate, since where appropriate, the braking effect of a coupled drive motor is required, could in the transition period in which the slope signal in the area the preferred pitch is just run the counter and cause a neutral shift. To prevent such a falsely identify a suitable for rolling or sailing mode topography sure can also be provided in addition, the gradient of the slope degree is evaluated, and that when exceeding a predetermined threshold for a positive gradient or falls below a specified limit stops for negative gradient of the counter.
[0035] The invention will be described, drawing is attached to an embodiment. This shows
[0036] 1 is a graph to the meter course in the implementation of a novel procedure for opening a roll-or sailing mode at Fahrpedal-/Bremspedalbetätigung,
[0037] 2 is a diagram with an alternative count curve for a gas pedal or brake pedal operation,
[0038] 3 is a diagram for carrying out a rolling or sailing mode when driving with a transition to a steep gradient, and
[0039] 4 is a diagram for carrying out a rolling or sailing mode when driving with a transition to a gentle slope.
[0040] The figures are curves for the invention of relevant driving situations such as in a motor vehicle such as a commercial vehicle with an automatic transmission and a transmission control Neutral occur controllable circuit for a rolling or sailing function.
[0041] An inventive method for controlling a rolling or sailing mode of such a vehicle is mainly due to the fact that a neutral circuit is released when the count of a rolling or sailing mode counter a predetermined first threshold value falls below the value or zero assumes the counter in the presence of at least one of stored in an event table events with each event assigned values is incremented, and that a neutral circuit is suppressed when the count exceeds a second threshold value or greater than zero.
[0042] Accordingly, the vehicle is on the time chart of the first one at a time t0 in a driving state where a relevant event is active. Accordingly, the count of n = 0 and a neutral shift of the transmission or opening a starting clutch is released. If the vehicle at this time in a for the rolling or sailing mode rated as suitable (negative) slope could cause a controller to the neutral circuit.
[0043] At a time t1 is a stored in an event table brake pedal MB with a specific Pedalauslenkwinkel or exceeded this Pedalauslenkwinkels. The count n is incremented once, so that it lies above the zero value. At a subsequent time t2 ends after a period of [Delta] t1, the relevant brake pedal MB, whereupon the counter clocked in time with the control unit is decremented. At a subsequent time t 3 after a period of [Delta] t2, where the count reduced as described, the driver is operating according to the MF signal an accelerator pedal with an event-related Pedalauslenkwinkel. The counter is counted down not more so, but is again increased by a certain increment. At a time t4, the accelerator operation MF ends after a period [Delta] t3, so that active from this time t4 is not a relevant event. The meter reading n is decremented from the next controller cycle and reached after a period of [Delta] t 4 nneutral at a time t5, a lower threshold at which a neutral circuit or opening the clutch is released.
[0044] The 2 shows to alternate meter course in which the counter when an event is active, not a one-time total, but is incremented continuously in computing cycle of the control unit to an event-dependent value, while each event is effective. Accordingly, at a time t1 is again a brake pedal actuation MB, whereupon the count in the period [Delta] t1 is steadily increasing, for example, two Inkrementeinheiten is increased for every 10 msec. For the counter at a continuous operation of the brake pedal does not accept excessively high values, the count n are limited to a Maimalwert. In the following period [Delta] t2, no event is active, the counter is decremented. At time t3, the driver pressed the accelerator again in event-relevant way. As a result, the count in the period [Delta] t3 increasing, for example, a Inkrementeinheit per 10 msec. At time t4 as before ending the accelerator operation and the meter starts running. The additional time-dependent height of the increment of the counter contains the release decision for a neutral or circuit for an opening of the clutch to give greater weight to the duration of an incident.
[0045] In 3 illustrates a scenario in which the vehicle travels on a road that goes from a rise in a steep decline. The upper curve in the diagram shows the measured or calculated slope m = dy / dx represents the average curve has a corresponding gradient m '= dy / dx <2> the slope m and the lower curve has a corresponding counter history n (t).
[0046] According to overcome an initially uniform increase in the vehicle a hill and the slope is negative, ie in a gradient. For released a transitional period [Delta] is tmroll the slope in a range [Delta] mroll, the advance, as the incline level is not in the event table set limits exceeds or falls below, as appropriate for activation of the rolling or sailing function. Accordingly, the count would take place now and at a time tneutral triggered the neutral circuit of the transmission or the opening of the clutch. The gradient m 'm is the slope, however, at this time is exceeded to a m'lim Steigungsgradient limit value, which indicates that a steep gradient, begins with a requirement in the event table limits are exceeded. The rolling or sailing mode would therefore be terminated after a short time. Consequently, the neutral circuit of the transmission or the opening of the clutch is not released, but the counter is stopped NFIX at a counter.
[0047] The 4, however, shows a scenario in which travel on the vehicle is a road that goes from a rise in a gentle slope, in which the vehicle over a relatively long period [Delta] tmroll in the rolling or sailing mode can pass. The count n is tnfix for a short period of time [Delta], during which the slope changes sign and the Grenzgradient is not reached, a constant initialization. Once the slope m and Steigungsgradient are the m 'in a permissible range, the count reduced n and solves the time tneutral the neutral circuit or opening of the starting clutch. The rolling or sailing mode is released shortly after reaching the gentle slope.
numeral list
m: slope
[Delta] mroll: pitch range for roles
m ': Steigungsgradient
m'lim: limit of Steigungsgradienten
n: count
NFIX: Held count
nneutral: count for neutral
MB: brake pedal
MF : accelerator operation
t: time
t1 ... t5: Time
[Delta] t 1 ... [Delta] t 4 : Period
[Delta] tmroll: rolling or sailing mode activation period
[Delta] tnfix: Period with bated count
QUOTES INCLUDED IN THE DESCRIPTION
[0048] This list of the applicant listed documents were automatically created and is exclusively taken to better inform the reader. The list is not part of the German patent or utility model. The DPMA is not responsible for any errors or omissions.
cited patent literature
[0049]
- DE 102 007 001 936 A1 [0004]
- DE 10,221,701 A1 [0008]
- DE 102 004 017 115 A1 [0010]
- WO 2003/037672 A1 [0012]
method for controlling a rolling or sailing mode of a vehicle
Technical and scientific translations
