publication number DE102009036047 (A1)
Release date: 2011-02-10
Inventor: BROWN HORST [DE]; DRAGON LUDGER [DE] ; SCHRAMM KURT [DE] + (BROWN, HORST; DRAGON, Ludger; SCHRAMM, KURT)
Applicant: DAIMLER CHRYSLER AG [DE] + (DAIMLER AG)
Classification:
International: B60W10/06; B60W20/00 ; B60W40/06
European: B60W10/06; B60W10/08; B60W20/00
Application number: 20,090,804 DE200910036047
Priority number (s): DE200910036047 20,090,804
The EPA is not responsible for the accuracy of data originating from other authorities than the EPO, and thus in particular not liable for its completeness, timeliness or fitness for a particular purpose. Information, please refer to the respective patent authorities.
this text translated description of DE 102009036047 (A1)
[0001] The present invention relates to a method for controlling a hybrid drive with an electric motor and a combustion engine of a vehicle, comprising the steps of: determining tilt data at speeds of the vehicle exterior and controlling the Hybrid drive according to the determined tilt data.
[0002] A method of controlling a hybrid drive are known. Depending on the design of hybrid drive such as serial, parallel, serial or parallel hybrid drive, it is possible to switch off the engine in certain driving conditions of the vehicle. DE 10 2006 022 547 A1 a motor vehicle with hybrid drive is known. The car has a hybrid drive with an internal combustion engine and an electric motor and a navigation system. In order to operate the vehicle more economically, a height information of the navigation system to control the hybrid drive can be used. For example, a pitch range ride, as evidenced by the fact that the sea level is constantly increasing, this can be found at correspondingly the electric motor supporting use of the system that can be integrated into a central control unit of the motor vehicle is otherwise at the same speed when driving in the plane is not necessary. Thus, the force applied by the internal combustion engine is reduced for the uphill ride. In the same way, a descent will be found, which can also be converted to the vehicle acting slope force of the electrical generator operated as a motor vehicle at constant speed in electric energy. DE 10 2006 054 327 A1 discloses a process for the momentum of use of a motor vehicle, are recorded at the position data and velocity data of the vehicle and together with data from a digitized map of a road network to be processed, and process in which the data is a starting point is determined at which a roll of the vehicle is initiated. In determining the starting point tilt data are taken into account the road network.
[0003] The object of the invention is an improved control of a hybrid drive with an electric motor and a combustion engine to enable a vehicle to identify particular data needed for this particularly simple manner.
[0004] The object is in a process for controlling a hybrid drive with an electric motor and a combustion engine of a vehicle, comprising the steps of: determining tilt data at speeds of the vehicle road and control the hybrid drive according to the determined tilt data by the step: determining the tilt data through a direct or indirect measurement of dissolved. Advantageously, the inclination data from the vehicle itself are determined. Advantageously, the direct or indirect measurement by means of already existing in the vehicle measurement and sensor devices and / or corresponding signals.
[0005] In one embodiment of the method to switch off the internal combustion engine as a function of the inclination data and / or switching off the combustion engine in accordance with a performance of the electric motor and the tilt data provided. Can advantageously be determined using the slope data, for example, whether a free roles in entirely the internal combustion engine is thus possible that the vehicle maintains a desired speed and / or achieved. The desired speed can be automated by a controller such as a longitudinal dynamic system such as a speed control and / or adaptive cruise control and / or other similar control systems are given. It is also possible that the speed by a human / machine interface, such as one of a driver of the vehicle actuated accelerator pedal module is specified. Analogously, it is possible to test whether the performance of the electric motor is sufficient in view of the tilt data to set the desired speed and / or acceleration of the vehicle. In performance of the electric motor, a maximum drive torque, maximum power and / or a maximum tensile force, which depends on the performance and current speed, to be understood.
[0006] In a further embodiment of the process to shut down the combustion engine is satisfied if the inequality [mathematical formula], where
FSt (t): one of the Tilt data-dependent acting on the vehicle drive force or slope force,
FR (t): a rolling resistance of the vehicle,
Flx (t): a drag on the vehicle,
FB (t): a braking resistance of the vehicle, and
t: a time are . The above parameters depend on characteristics of the vehicle and the time t, in particular on a driving condition of the vehicle. Beneficial can be determined by the inequality, if the driving force greater inclination of the road FSt (t) and a corresponding slope force than the rest of the driving resistance, with the result that when the internal combustion engine may be at least a constant speed can be maintained. Advantageous in fuel can be saved. It is also possible in the event that the driving force Fst (t) is greater than the other components of force by a recuperation, a generator and / or the electric motor can be used as a generator, energy einzuspeichern in a hybrid car battery.
[0007] In a further embodiment of the method to switch off the combustion engine is provided which is satisfied if the inequality [mathematical formula], where FElektro (t) is generated by means of the electric motor of the hybrid drive, electric drive motor of the vehicle. Advantageously by the electric motor can overcome the resistance of the vehicle driving be, so that even at completely the internal combustion engine is a completely electric drive. For this purpose, the hybrid drive have a corresponding decoupling between the electric motor and the internal combustion engine, which allows a purely electrical drive of the vehicle.
[0008] In a further embodiment of the method measuring the inclination data using a tilt sensor and / or measuring the inclination data using a longitudinal acceleration sensor of a vehicle dynamics control of the vehicle and / or measuring the tilt data by means of the longitudinal acceleration sensor at a constant speed of the vehicle are provided . Advantageously, an already existing inclination sensor Vehicle used. Advantageously, the longitudinal acceleration sensor of the vehicle dynamics control of the vehicle used, and this beneficial measures in addition to acceleration forces acting on the vehicle and a downgrade downslope acceleration if the speed is constant.
[0009] In a further embodiment of the method a determination of the slope data using a gradient signal to a control unit to control the hybrid drive and / or measuring the inclination data are means of evaluating a responsiveness of the vehicle to control the longitudinal dynamics provided the vehicle. Advantageously, if a section or a transfer characteristic of Vehicle is known to be deduced by means of a reaction or response behavior of the vehicle on the slope data of the road that traverses the vehicle. In the known route, it may be in particular a drive train of the vehicle and the vehicle ground. Also can be advantageously used an already existing slope signal from the controller to control the hybrid drive. Alternatively or additionally, it is conceivable that in different ways determined inclination data with each match and plausibility to appropriate signals, in order to identify particularly heavy-duty tilt data. Alternatively or additionally, it is conceivable to provide a loading condition of the vehicle to be included, especially by means of appropriate sensors to spring damper devices of the vehicle.
[0010] In a further embodiment of the method a determination of a longitudinal acceleration signal identifying, in particular by means of differentiation, by at least one member of the following group: a speed signal of the vehicle, a control signal from control unit, a radar sensor signal of a radar sensor of the vehicle and / or provided a cutting of the longitudinal acceleration of the slope data into a distinctive gravimetric component and a longitudinal momentum component and / or a determination of the longitudinal momentum component using a measuring signal of the vehicle. Advantageously, by means of already known signals are split the signal that the gravimetric component is known. Advantageously, using the gravimetric component to the tendency of the current road traffic will resign. Using the gravimetric component can be identified a downgrade acceleration, which is normalized for example by a Arcussinusfunktion in a tilt angle of the busy road.
[0011] The object is also in a vehicle, particularly a motor vehicle with a means of controlling controllable hybrid drive with an electric motor and a combustion engine, designed to set up and / or constructed to perform a previously described method solved. This results the above-described advantages.
[0012] Further advantages, features and details are provided in the following description in which - described, at least one embodiment in detail - where appropriate, with reference to the drawings. Described and / or illustrated features by themselves or in any reasonable combinations of the subject invention, where appropriate, regardless of the claims, and may in particular also the subject of one or more separate invention / s are. Same, similar and / or functionally identical parts are given the same reference numbers. Shows
[0013] 1 is a schematic side view of a vehicle with a hybrid engine with an electric motor and an engine that travels on an inclined road.
[0014] 1 shows a vehicle 1, which has a indicated by reference numeral 3 hybrid drive with an electric motor and a combustion engine. The vehicle 1 travels on a 7 to a tilt angle 5 steep sloping road
[0015] The vehicle 1 21 has a wheel sensor, which measures a finger-pointing in the longitudinal direction of the vehicle, a longitudinal acceleration 11th The longitudinal acceleration 11 is composed of a longitudinal momentum component 13 and a component gravimetric 15th The gravimetric component 15 resulting from a decomposition of a vector perpendicular gravity 17 projected onto a parallel road running 7 to the longitudinal axis of the vehicle 1. The gravimetric component 15 corresponds to the slope descending from the acceleration a driving force Fst (t) due to the inclined angle 5 to the Road 7 is calculated. The longitudinal momentum component 13 is measured by means of a longitudinal acceleration sensor 9. Alternatively or additionally, the longitudinal acceleration 11 of the present means of the vehicle 1 signals to differentiate in particular by means of measuring signals, such as a wheel sensor from the wheel sensor 21, a speed signal and / or a control signal of a non-illustrated control unit of the vehicle 1 to control the hybrid drive 3 be determined.
is [0016] The longitudinal acceleration sensor 9 it is a ride-observer who can measure the gravimetric component only indirectly, as the acceleration of gravity acts equally on the vehicle as on the measurement provided materials for the determination of accelerations. The wheel sensor 21, but authorized by its contact with the road 7, a reference to a road wayside with the system and can therefore determine the longitudinal acceleration 11 from the perspective of the stationary system, ie a stationary observer. The fixed observer sees the sum of the gravimetric component 15 and the longitudinal momentum component 13, which results from the driving resistance and driving forces of the hybrid drive 3. The longitudinal acceleration sensor 9 only the longitudinal momentum component of the sum of 13 measures on the vehicle except the gravitational forces acting. For a free rollers without drive, the measured longitudinal momentum component would be 13 to zero. The vehicle is stopped, the longitudinal momentum component representing 13 of the gravimetric component 15 with the opposite sign. The means of the wheel sensor 21 is fixed or determinable observable longitudinal acceleration 11 of the vehicle 1 is equal to the sum of the longitudinal momentum component 13 and the 15th component gravimetric
[0017] The hybrid drive 3, in particular an electric motor of the hybrid system 3 can be assigned to a non-illustrated battery by means of kinetic energy of the vehicle 1 can be brought on during recuperation. Alternatively or additionally, it is conceivable that the vehicle 1 is only a conventional power source such as an internal combustion engine has, which can also be switched off depending on the component gravimetric 15th
[0018] The internal combustion engine of the vehicle 1 can be turned off, filled as soon as the inequality [mathematical formula] is
with
FSt (t): a gravimetric from the component 15 resulting driving force
FR (t): a rolling resistance of the vehicle 1,
Flx (t): a drag of the vehicle 1,
FB (t): a resistor the vehicle 1, and
t: a time are.
[0019] If FSt (t) is greater than the right side of the inequality standing force components can be stored advantageously by the recuperation potential energy in the battery of the vehicle 1.
[0020] If the vehicle has 1 so that a purely electric driving is possible, the engine can be turned off if the inequality [mathematical formula] holds, where
FElektro (t): one by the electric motor of the hybrid drive 3 producible electrical driving force.
[0021] To determine the size FSt (t) can be advantageous to the signals of the longitudinal acceleration sensor used 9 and the wheel sensor 21, it being understood that the longitudinal acceleration 11 is the sum of the longitudinal momentum component 13 and component 15 of the gravimetric same. This gravimetric component 15 can be determined. From the gravimetric component, the angle 5 of the Road 7 are formed by an arc sine to contact a gravimetric ratio of the component 15 divided by the gravitational acceleration 17th Advantageously, the shutdown of the engine independent of any other tax and / or control strategy of the hybrid drive 3 of vehicle 1 made, such as a battery charge, a length and a percent slope of a downhill section of road 7, a speed the vehicle 1, a condition of the vehicle 1 surrounding traffic, weather conditions and / or the like. It is also possible to determine the longitudinal momentum component 13 to an arbitrary manner, for example by the wheel sensors or radar sensor.
[0022] Advantageously, potential energy of the vehicle 1 is used so that shown in runs, so a situation like in Figure 1, the engine of the hybrid system 3 of the vehicle 1 can be turned off, advantageously, an otherwise occurring drag load of the engine of vehicle wheels 19 of the vehicle 1 can be decoupled.
[0023] Advantageously, with less or no power generation from the potential energy, for example if the angle is 5 relatively small and / or the driving speed is lower than a corresponding desired speed to maintain vehicle speed and / or be added to improve the same, the electric motor of the hybrid drive 3. In the other case, if the angle is 5 so great that the speed would increase over the desired speed, can be converted into a Rekuperationsbetriebsweise the potential energy of the vehicle 1 into electrical energy and are stored in the battery by the electric motor of the hybrid drive 3 . can
[0024] Advantageously, the current procedure without additional Information on how get along, for example, the current vehicle position with the downhill advantage using an existing sensor system of the vehicle 1, for example, braking, vehicle dynamics control and / or suspension systems detected, especially by means of the longitudinal acceleration sensor 9 and / or the wheel sensor 21st can
[0025] Advantageously, a fuel and / or CO2 emissions of the vehicle 1 can be reduced, with the can in an illustrated downhill potential energy E pot can be used. Advantageously, the descent by means of the longitudinal acceleration sensor 9 can be detected. Advantageously, the vehicle 1 due to the potential energy released at constant or increasing speed move on. Advantageously, the vehicle is moving because of the released potential energy and with the support of the electric motor with a constant or increasing speed. Advantageously, the vehicle is moving due to the potential energy released at constant or decreasing vehicle speed, while making advantageous additional potential energy is stored in a vehicle internal memory, such as the battery. Advantageous can be developed, which makes do with smaller energy storage due to topological knowledge of a driving distance of the vehicle 1, an operational strategy. Advantageous due to the topological knowledge, the route of the operating strategy to be developed by which additional driving situations on a purely electrical basis for a longer operating independently of the engine in its optimum operating condition of the driver's permits, as the driving situation in purely electrical operation, in particular predictive occurs frequently.
[0026] Advantageously it is possible to record using the longitudinal acceleration sensor 9 and / or wheel sensor 21 determines gravimetric component 15 over time t and store in a suitable storage of the vehicle 1, particularly having regard to the traveled route, so that advantageous to realize an adaptive system is that after repeated passage through the same cycle to the data stored relies and depends on hybrid drive 3 controls more energy efficient. can
[0027] Advantageously the method be used in conjunction with a speed control, as in the case of a constant speed, the longitudinal acceleration 11 to zero, and therefore, the gravimetric component 15 most easily determined only by the longitudinal acceleration sensor 9.
numeral list
1: Vehicle
3: hybrid
5: angle
7: Road
9: longitudinal acceleration sensor
11: longitudinal acceleration
13: longitudinal momentum component
15: gravimetric component
17: acceleration due to gravity
19: Cycling
21: wheel sensor
QUOTES INCLUDED IN THE DESCRIPTION
[0028] This list of references cited by the applicant was automatically generated and is included solely 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
[0029]
- DE 102 006 022 547 A1 [0002]
- DE 102 006 054 327 A1 [0002]
method for controlling a hybrid drive
Technical and scientific translations
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