Determining an engine torque error during an engine torque intervention

• US 8,321,106 B2
• Filed: 06/17/2008
• Issued: 11/27/2012
• Est. Priority Date: 06/18/2007
• Status: Expired due to Fees

• Current Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Original Assignee: Schaeffler Technologies AG & Co.KG (INA-Holding Schaeffler GmbH & Co. KG)
• Inventors: Preisner, Marian, Benz, Juergen
• Primary Examiner(s): Tran, Dalena
• Assistant Examiner(s): HOLLOWAY, JASON R
• Application Number:
  US12/214,152
• Publication Number:
  US 20090012683A1
• Time in Patent Office: 1,624 Days
• Field of Search: 701/29, 701/31, 701/34, 701/67, 701/36, 701/51, 701/68, 701/29.1, 701/34.4, 477/175
• US Class Current: 701/67
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2710/027 Clutch torque
• CPC Class Codes: B60W 2710/0666 Engine torque
• CPC Class Codes: B60W 30/19 Improvement of gear change, e.g. by synchronisation or smoothing gear shift
• CPC Class Codes: F02D 2200/1004 Estimation of the output torque
• CPC Class Codes: F02D 41/1497 With detection of the mechanical response of the engine
• CPC Class Codes: F02D 41/22 Safety or indicating devices for abnormal conditions in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809
• CPC Class Codes: F16H 63/502 for smoothing gear shifts

Abstract

A method for determining an error in engine torque, wherein at least before and after a predetermined change in the engine torque the change in engine speed is registered, and this is compared with the engine torque before and after the change in the engine torque.

Claims

1. A method for determining an error in engine torque in an engine of a motor vehicle, comprising:

registering a change in the engine speed of the engine via at least one of a measuring unit or a control unit at least before and after a predetermined change in the engine torque of the engine; and

comparing the registered change in the engine speed of the engine with the engine torque of the engine before and after the predetermined change in the engine torque to determine an engine torque error,

wherein the registering step includes obtaining a plurality of engine torques of the engine and a plurality of clutch torques of a clutch of the motor vehicle; and

wherein the plurality of engine torques are obtained from a controller of the engine; and

wherein the plurality of clutch torques are obtained from a characteristic curve from a position of an actuator of the clutch.

2. The method as recited in claim 1 wherein the change in the engine speed is multiplied by an inertia of the engine.

3. The method as recited in claim 1 further comprising deducting a transmitted engine clutch torque from the engine torque before and after the predetermined change.

4. The method as recited in claim 1 further comprising controlling the predetermined change in the engine torque by a control unit.

5. The method as recited in claim 1 further comprising controlling the predetermined change in the engine torque by a clutch controller.

6. The method as recited in claim 1 wherein values for the engine torques and/or values for clutch torques before and after the predetermined change in the engine torque are averaged for a plurality of values.

7. The method as recited in claim 1 wherein the method is carried out when the predetermined change in the engine torque exceeds a certain threshold value.

8. The method as recited in claim 1 further comprising determining a clutch torque error from the engine torque error.

9. The method as recited in claim 1 wherein the engine torque is determined by an engine control system.

10. The method as recited in claim 1 wherein the engine torque is calculated and/or estimated from various engine characteristics of the engine.

11. The method as recited in claim 1 wherein the engine torque error is calculated according to the equation:

T_Eng,error=(J_Eng{dot over (ω

)}_Eng)_before−

T_Eng,before+T_Cl,before−

((J_Eng{dot over (ω

)}_Eng)_after−

T_Eng,after+T_Cl,after)

where;

J_Eng=moment of inertia of the engine,

{dot over (ω

)}_Eng=acceleration of the engine speed,

T_Eng=engine torque from the engine control system,

T_Cl=clutch torque from the characteristic curve,

T_Eng,error=error in the engine torque,

T_Cl,error=error in the clutch torque.