Method for controlling the engine of a motor vehicle having a manual transmission

• US 20070161457A1
• Filed: 02/01/2005
• Published: 07/12/2007
• Est. Priority Date: 02/12/2004
• Status: Active Grant

• Current Assignee: Audi AG (Volkswagen AG)
• Original Assignee: Robert Bosch GmbH, Audi AG (Volkswagen AG)
• Inventors: Geywitz, Georg, Meyer, Herbert, Muhler, Michael, Vogt, Bernhard
• Granted Patent: US 9,017,218 B2
• Time in Patent Office: Days
• US Class Current: 477/107
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 30/18027 Drive off, accelerating from standstill
• CPC Class Codes: F02D 11/105 characterised by the function converting demand to actuation, e.g. a map indicating relations between an accelerator pedal position and throttle valve opening or target engine torque
• CPC Class Codes: F02D 2250/18 Control of the engine output torque
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position

Abstract

In a motor vehicle having a manual transmission, for, in particular, limiting the engine speed during the start-up operation when fulfilling at least one permission criterion for the engine torque, said criterion depending on the driving state of the motor vehicle, a default engine torque is preset, which is specified according to at least one engine characteristic value and which can be reduced with regard to the set engine torque called for by the position of the accelerator pedal of the motor vehicle.

Claims

1. Method for controlling the engine of a motor vehicle having a manual transmission, wherein when at least one approval criterion for the engine torque (M) which is dependent on the driving state of the vehicle a default engine torque (M_v) which can be reduced relative to the setpoint (M_s) required by the position of the accelerator of the vehicle is stipulated and in that the default engine torque (M_v) is determined as a function of at least one engine characteristic (n, Q).

2. The method as claimed in claim 1, wherein the approval criterion is the driving speed (v) of the vehicle, and wherein the default engine torque (Mv) is stipulated depending on at least one engine characteristic (n, Q) when a speed threshold (vs) for the driving speed (v) of the vehicle is not reached.

3. The method as claimed in claim 2, wherein the default engine torque (M_v) is stipulated only after recognition of a start-up process of the vehicle depending on at least one engine characteristic (n, Q).

4. The method as claimed in claim 2, wherein an additional approval criterion is a specific delay time (τ

) after recognizing the process of the vehicle'"'"'s starting up, and wherein the default engine torque (M_v) after a delay time (τ

) elapses is stipulated depending on at least one engine characteristic (n, Q).

5. The method as claimed in claim 1, wherein at least the engine speed (n) and the quotient (Q) of the engine speed (n) and the driving speed (v) of the vehicle are used as engine characteristics for determining the default engine torque (M_v).

6. The method as claimed in claim 5, wherein the default engine torque (M_v) which causes speed limitation of the engine speed (n), is reduced relative to the setpoint engine torque (M_s) when the engine speed (n) exceeds a speed threshold (ns) and the quotient (Q) of the engine speed (n) and driving speed (v) of the vehicle is within a specific value range.

7. The method as claimed in claim 6, wherein a value of 4600 rpm is stipulated as the speed threshold (ns) for the engine speed (n).

8. The method as claimed in claim 1, wherein the default engine torque (M_v) is determined by applying a torque factor (M_F) to the setpoint engine torque (M_s).

9. The method as claimed in claim 8, wherein the torque factor (M_F) is determined from a characteristic map.

10. The method as claimed in claim 1, wherein when the default engine torque (M_v) deviates from the setpoint engine torque (M_s) an action on at least one of the throttle valve, the ignition and the fuel injection of the vehicle is initiated.

11. The method as claimed in claim 2, wherein a value in the range from 25 km/h to 40 km/h is stipulated as the speed threshold (v_s) for the driving speed (v) of the vehicle.

12. The method as claimed in claim 11, wherein a value of 35 km/h is stipulated as the speed threshold (v_s) for the driving speed (v) of the vehicle.

13. The method as claimed in claim 1, wherein the default engine torque (M_v) in idling of the vehicle is stipulated for acoustically influencing the engine noise.

14. The method as claimed in claim 1, wherein the default engine torque (M_v) in the process of the vehicle'"'"'s starting up is stipulated for avoiding damage to the clutch of the vehicle.