publication number DE102009036047 (A1)
publication 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.
translate this text 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 a tilt data traffic from the vehicle and road taxes for 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. To the motor vehicle operate economically to a height information of the navigation system to control the hybrid drive can be used. For example, a slope section is traversed, as shown 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 on a ride 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 identified that could allow the addition to the vehicle acting slope force can be converted by the electric 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 to be registered with 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 out 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 of a to enable vehicle, in particular to identify needed data in a particularly simple manner.
[0004] The object is in 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 road and control the hybrid drive according to the determined tilt data by the step: Determine the slope data released by a direct or indirect measurement. Advantageously, the inclination data from the vehicle itself are determined. Advantageously, the direct or indirect measurement using already existing in the vehicle measurement and sensor devices and / or appropriate Signals occur.
[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 are 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 a will by a driver of the vehicle actuated accelerator pedal module 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 method is to switch off the engine, is satisfied if the inequality [mathematical formula], where
FSt (t) is dependent on the inclination data 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 emitters.The aforementioned parameters depend on characteristics of the vehicle and the time t, in particular a driving state of the vehicle. Beneficial can be determined by the inequality, if the driving force of the road inclination FSt (t) and a corresponding slope force is larger than the other driving resistance, with the result that when the internal combustion engine 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) by the electric motor of the hybrid system be generated electric drive motor of the vehicle. Advantageously by the electric motor, the driving resistance of the vehicle can be overcome so that is possible even when the internal combustion engine altogether a completely electric driving. 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 are a Measuring the slope of the data using longitudinal acceleration sensor at a constant speed of the vehicle provided. Advantageously, an already existing inclination sensor of the 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 on a control of a planned longitudinal dynamics of the vehicle. Advantageously, if a section or a transfer characteristic of the vehicle is known to draw conclusions by means of a reaction or response behavior of the vehicle on the slope data of the road that traverses the vehicle to be. 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 tendency to synchronize data with each other and corresponding the plausibility signals to determine so special heavy-duty tilt data. Alternative to be included and / or additionally, it is conceivable to provide a loading condition of the vehicle and, in particular 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 a cutting of the longitudinal acceleration a tendency data characterizing gravimetric Component and a longitudinal momentum component and / or a determination of the longitudinal momentum component using a measuring signal of the vehicle provided. Advantageous means of already known signals, the signal can be disassembled to 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 hybrid drive system controlled by a control with an electric motor and a combustion engine, designed, configured and / or designed for performing a method described previously solved. It results in 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 a combustion engine, which 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 from a longitudinal momentum component 13 and a component gravimetric 15th The gravimetric component 15 resulting from a decomposition of a gravity vector 17 projected perpendicular to 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 of the vehicle 1 through 11 of the present 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 signal of a not shown control unit of the vehicle 1 to control the hybrid drive 3 can be determined.
[0016] The longitudinal acceleration sensor 9 is 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 measures only the longitudinal momentum component 13 from the sum of the gravitational force the vehicle off the attacking forces. 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 component gravimetric 15.
[0017] The hybrid drive 3, in particular an electric motor of the hybrid system 3 can be assigned to a non-illustrated battery, can be brought on by the kinetic energy of the vehicle 1 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 being
FSt (t): a gravimetric from 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 braking resistance of 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): a means of the electric motor of the Hybrid drive 3 is producible electrical driving force.
[0021] To determine the size FSt (t) can be advantageous to the signals of the longitudinal acceleration sensor 9 and the wheel sensor 21 are used, it being understood that the longitudinal acceleration 11 is the sum of the longitudinal momentum component 13 and the gravimetric component 15 equal. 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 of 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 depicted in runs, so a situation like in Figure 1, the engine of the hybrid system 3 of the vehicle 1 can be turned off, and advantageously otherwise occurring drag load of the engine of vehicle wheels 19 of vehicle 1 can be decoupled.
[0023] Advantageously, with less or no power generation from the potential energy, for example if the angle is comparatively small, 5 and / or the driving speed is lower than a corresponding desired speed to maintain vehicle speed and / or to increase it, the electric motor are of the hybrid drive 3 connected. In the other case, if the angle is 5 so great that the speed would increase over the desired speed, it means the electric motor of the hybrid system 3 in a Rekuperationsbetriebsweise the , potential energy of the vehicle 1 is converted into electrical energy and are stored in the battery. can
[0024] Advantageously the process without additional geographic information, as commented, for example, the current vehicle position with the downhill advantage using an existing sensor system of the vehicle 1, for example by braking, stability control and / or suspension systems can be detected, in particular by 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 can move one because of the potential energy released at constant or increasing speed. 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. Advantageously, due to topological knowledge of a route of the vehicle 1, an operating strategy to be developed, which makes do with smaller energy stores. Advantageous due to the topological knowledge, the route of the operating strategy to be developed including by additional driving situations on a purely electrical basis for an extended operation of the engine independently allowed in its optimum operating condition of the driver's request, 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 memory of the vehicle 1, particularly having regard to the route driven, it can be advantageously realized that an adaptive system, which uses after repeated passage through the same cycle to the stored data and, depending on the 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: Rad
21: wheel sensor
QUOTES INCLUDED IN THE DESCRIPTION
[0028] This list of the applicant listed documents was automatically generated and is exclusively for better information of the reader absorbed. 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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