Method and system for the regulation and/or control of an engine gearbox unit in a motor vehicle

• US 20050222745A1
• Filed: 03/25/2005
• Published: 10/06/2005
• Est. Priority Date: 09/25/2002
• Status: Active Grant

• Current Assignee: Bayerische Motoren Werke AG
• Original Assignee: Bayerische Motoren Werke AG
• Inventors: Wolf, Lothar, Schumacher, Hubert, Krenn, Helmut
• Granted Patent: US 7,096,106 B2
• Time in Patent Office: Days
• US Class Current: 701/90
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/10 including control of change-speed gearings
• CPC Class Codes: B60W 10/11 Stepped gearings
• CPC Class Codes: B60W 2050/0025 Transfer function weighting factor
• CPC Class Codes: B60W 2520/30 Wheel torque
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 2710/105 Output torque
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60W 50/06 Improving the dynamic response of the control system, e.g. improving the speed of regulation or avoiding hunting or overshoot

Abstract

A method for regulating and/or controlling an engine-transmission unit in a motor vehicle includes prioritizing torque demands to obtain an only torque value, storing the only torque value as a current successful situation and retaining the torque value for the previous successful situation, and processing the torque value of the current successful situation as well as the torque value of the previous successful situation to comparable torque values in each case required for the implementation of the demands. The method farther includes changing a desired torque demand at driving wheels of the motor vehicle from the torque value of the previous successful situation to the torque value of the current successful situation in the event of a priority change when the current successful situation is different from the previous successful situation, sending the desired torque demand to an electronic controller, and carrying out the desired torque demand by controlling at least one of engine parameters and a ratio of a transmission unit.

Claims

1. A method for regulating and/or controlling an engine-transmission unit (M, G) in a motor vehicle, comprising:

in a function unit (MASTER) connected to a controller (CTRL), prioritizing torque demands (S_WI, S_XX, . . . , S_AC, S_XY) of demanders (M_XX, . . . , M_XY) to obtain an only torque value;

storing the only torque value as a current successful situation (S_ZZ_PRIO) and retaining the torque value for the previous successful situation (S_ZZ_PRIOOLD);

processing the torque value (for example, S_XX) of the current successful situation (S_ZZ_PRIO) as well as the torque value (for example, S_XY) of the previous successful situation (S_ZZ_PRIOOLD) to comparable torque values in each case required for the implementation of the demands (S_XX;

S_XY);

in the event of a priority change when the current successful situation (S_ZZ PRIO) is different from the previous successful situation (S_ZZ_PRIOOLD), changing a desired torque demand at driving wheels (R) of the motor vehicle from the torque value (M WHEEL_DESIRED=M_WHEEL_XY) of the previous successful situation (S_ZZ PRIOOLD) to the torque value (M_WHEEL_DESIRED=M_WHEEL_XX) of the current successful situation (S_ZZ_PRIO);

sending the desired torque demand (M_WHEEL_DESIRED) to an electronic controller (CTRL); and

carrying out the desired torque demand by controlling at least one of engine (M) parameters and a ratio of a transmission unit (G).

2. The method according to claim 1, comprising, in the function unit (MASTER),

considering internal torque demands of other systems (S_XY) inside the vehicle and external torque demands which result from different environmental and driving situations (S_XX);

converting the external and internal torque demands into wheel torques (M WHEEL_XY, M_WHEEL_XX).

3. The method according to claim 2, comprising, in a preparatory manner, detecting all internal and/or external demanders and torque demands and determining corresponding wheel torque demands (M_WHEEL_FPI, M_WHEEL_XX, M_WHEEL_WI, . . . , M_WHEEL_XY, M_WHEEL_ACC).

4. The method according to claim 3, comprising storing the wheel torque demands (M_WHEEL_FPI, M_WHEEL_XX, M_WHEEL_WI, . . . , M_WHEEL_XY, M_WHEEL ACC).

5. The method according to claim 4, comprising prioritizing the torque demands such that finally only one situation (S_ZZ_PRIO) is prioritized.

6. The method according to claim 5, comprising noting the torque demand of a prioritized situation (S_ZZ_PRIO) with a condition flag (Z_PRIO_VECT).

7. The method according to claim 6, comprising storing a torque demand of an old prioritized situation (S_ZZ_PRIOOLD) noted by an another condition flag(Z_VECT_OLD).

8. The method according to claim 7, comprising storing the wheel torque demands (M_WHEEL_FPI, M_WHEEL_XX, M_WHEEL_WI, . . . , M_WHEEL_XY, M_WHEEL ACC) in a vector or a linear memory (M_WHEEL_VECT).

9. The method according to claim 8, comprising defining the condition flag (Z PRIO_VECT) for the torque demand of a prioritized situation (S_ZZ_PRIO) and the condition flag (Z_VECT_OLD) for the torque demand of an old prioritized situation (S_ZZ_PRIOOLD) as pointers at corresponding positions in the memory (M_WHEEL_VECT).

10. The method according to claim 9, comprising, differentiating between a priority change and a progression of the regulating operation without any priority change.

11. The method according to claim 10, further comprising, in the event of a priority change, creating a constant transition in the desired torque demand (M_WHEEL DESIRED), which is determined as a function of a time (T_TRANSITION), the difference between the old and new desired torque demands, and/or the new desired torque demand or a detected and prioritized situation (Z_PRIO_VECT, Z_PRIO_VECTOLD).

12. The method according to claim 11, comprising, in the event of a transition, looking up and adjusting a time (T_TRANSITION) applicable to the transition while defining values from a matrix (Mx).

13. The method according to claim 12, comprising selecting the shape of a transition curve as a function of the detected and prioritized situation or torque demand.

14. A system for implementing the method according to claim 1, comprising:

the controller having an input side;

the function unit (MASTER) connected to the input side of the controller (CTRL), wherein the functional unit calculates the desired torque demand (M_WHEEL DESIRED) from the demanders (M_XX, . . . , M_XY) for regulating at least one of the engine (M) and the transmission unit (G) for providing a torque demand at the driving wheels (R) of the motor vehicle.

15. The system according to claim 14, comprising ;

memory (M_WHEEL_VECT) that is constructed to store the torque demands (M_WHEEL_FPI, M_WHEEL_XX, M_WHEEL WI, . . . , M_WHEEL_XY, M_WHEEL_ACC) of the demanders.

16. The system according to claim 15, wherein the functional unit also prioritizes and weighs torque demands related to driving situations.

17. The system according to claim 16, comprising at least one of a time (T TRANSITION) and a corresponding curve shape, which are used for a transition from one prioritized desired torque demand to another prioritized desired torque demand.