Method for operating a driving system, in particular, of a motor vehicle

• US 9,227,625 B2
• Filed: 12/01/2014
• Issued: 01/05/2016
• Est. Priority Date: 12/02/2013
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Meier, Frank, Kesch, Bernd, Jessen, Holger, Rieker, Daniel
• Primary Examiner(s): Nguyen, Cuong H
• Application Number:
  US14/556,348
• Publication Number:
  US 20150151735A1
• Time in Patent Office: 400 Days
• Field of Search: 701/22, 180/65.265, 180/65.285, 903/902, 123/478, 123/492
• US Class Current: 1/1
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/10 Controlling the power contribution of each of the prime movers to meet required power demand
• CPC Class Codes: B60W 20/50 Control strategies for responding to system failures, e.g. for fault diagnosis, failsafe operation or limp mode
• CPC Class Codes: B60W 2510/0657 Engine torque
• CPC Class Codes: B60W 30/194 related to low temperature conditions, e.g. high viscosity of hydraulic fluid

Abstract

A method for operating a driving system of a motor vehicle, in particular, the driving system having an internal combustion engine and at least one electric motor, and during warm-up of the internal combustion engine, the latter being loaded with a specifiable torque; and the at least one electric motor generating a torque at least at times, to unload or load the internal combustion engine. An actual torque of the internal combustion engine is compared to a specifiable first setpoint torque of the internal combustion engine; a difference of the actual torque from the first setpoint torque being formed; and a time integral being formed over the difference formed; and a fault being detected in the warm-up of the internal combustion engine, as a function of the time integral formed.

Claims

1. A method for operating a driving system of a motor vehicle, the driving system having an internal combustion engine and at least one electric motor, the method comprising:

loading, during a warm-up of the internal combustion engine, the motor with a specifiable torque;

generating, via the at least one electric motor, at least at times a torque to unload or to load the internal combustion engine;

comparing an actual torque of the internal combustion engine to a specifiable first setpoint torque of the internal combustion engine;

forming a difference of the actual torque from the first setpoint torque;

forming a time integral over the difference; and

detecting a fault in the warm-up of the internal combustion engine, as a function of the time integral.

2. The method of claim 1, wherein, in a time interval in which an operating state of the internal combustion engine is changed and/or a change in the operating state is to be expected, the time integral is not changed.

3. The method of claim 1, wherein the forming of the time integral is activated as a function of a condition.

4. The method of claim 3, wherein the first setpoint torque is compared to a second setpoint torque of the internal combustion engine, the second setpoint torque characterizing an operating state of the driving system, in which the electric motor would be operated without the presence of the warm-up, and wherein the forming of the time integral is performed if an absolute amount of a difference of the first setpoint torque and the second setpoint torque of the internal combustion engine exceeds a second threshold value.

5. The method of claim 3, wherein the forming of the time integral is started as a function of the torque of the electric motor.

6. The method of claim 5, wherein a first setpoint torque of the electric motor is compared to a second setpoint torque of the electric motor, the second setpoint torque characterizing an operating state of the driving system, in which the electric motor would be operated without the presence of the warm-up, and wherein the forming of the time integral is started if an absolute amount of a difference of the first setpoint torque and the second setpoint torque of the electric motor exceeds a second threshold value.

7. The method of claim 1, wherein an absolute amount is ascertained from the difference formed of the actual torque from the first setpoint torque of the internal combustion engine, and wherein the time integral is formed over the ascertained absolute amount.

8. The method of claim 1, wherein, when the electric motor generates a torque to load the internal combustion engine, a first time integral is formed, which is only changed if the actual torque of the internal combustion engine is less than the first setpoint torque of the internal combustion engine, and wherein if the electric motor generates a torque to unload the internal combustion engine, a second time integral is formed, which is only changed if the actual torque of the internal combustion engine is greater than the first setpoint torque of the internal combustion engine.

9. The method of claim 1, wherein the formation of the time integral is terminated when the warm-up of the internal combustion engine is ended and/or the first setpoint torque of the internal combustion engine lies outside a specifiable torque range of the internal combustion engine for at least a specifiable time span.

10. The method of claim 1, wherein an accumulated time duration is ascertained between a start and an end of the formation of the time integral, those time intervals in the accumulated time duration not being taken into account in which an operating state of the internal combustion engine is changed and/or a change in the operating state of the internal combustion engine is to be expected.

11. The method of claim 10, wherein after the end of the formation of the time integral a value of the time integral is divided by the accumulated time duration.

12. The method of claim 11, wherein the value of the time integral divided by the accumulated time duration is compared to a third threshold value, and if the value of the time integral divided by the accumulated time duration is greater than the third threshold value, a fault is detected in the warm-up of the internal combustion engine.

13. The method of claim 12, wherein an entry occurs in a fault memory of a diagnostic device for the driving system, or for the motor vehicle and/or a warning notice for the driver occurs and/or a fault routine is performed using a computer program that controls the driving system, or the motor vehicle.

14. A control and/or regulating device for an internal combustion engine, comprising:

an operating arrangement for operating a driving system of a motor vehicle, the driving system including the internal combustion engine and at least one electric motor, including;

a loading arrangement to load, during a warm-up of the internal combustion engine, the motor with a specifiable torque;

a generating arrangement to generate, via the at least one electric motor, at least at times a torque to unload or to load the internal combustion engine;

a comparing arrangement to compare an actual torque of the internal combustion engine to a specifiable first setpoint torque of the internal combustion engine;

a difference forming arrangement to form a difference of the actual torque from the first setpoint torque;

a time integral forming arrangement to form a time integral over the difference; and

a detecting arrangement to detect a fault in the warm-up of the internal combustion engine, as a function of the time integral.

15. A computer readable medium having a computer program, which is executable by a processor, comprising:

a program code arrangement having program code for operating a driving system of a motor vehicle, the driving system having an internal combustion engine and at least one electric motor, by performing the following;

loading, during a warm-up of the internal combustion engine, the motor with a specifiable torque;

generating, via the at least one electric motor, at least at times a torque to unload or to load the internal combustion engine;

comparing an actual torque of the internal combustion engine to a specifiable first setpoint torque of the internal combustion engine;

forming a difference of the actual torque from the first setpoint torque;

forming a time integral over the difference; and

detecting a fault in the warm-up of the internal combustion engine, as a function of the time integral.

16. A driving system of a motor vehicle, comprising:

an internal combustion engine;

at least one electric motor; and

a control and/or regulating device for an internal combustion engine, including an operating arrangement for operating a driving system of the motor vehicle, the driving system including the internal combustion engine and at least one electric motor, including;

a loading arrangement to load, during a warm-up of the internal combustion engine, the motor with a specifiable torque;

a generating arrangement to generate, via the at least one electric motor, at least at times a torque to unload or to load the internal combustion engine;

a comparing arrangement to compare an actual torque of the internal combustion engine to a specifiable first setpoint torque of the internal combustion engine;

a difference forming arrangement to form a difference of the actual torque from the first setpoint torque;

a time integral forming arrangement to form a time integral over the difference; and

a detecting arrangement to detect a fault in the warm-up of the internal combustion engine, as a function of the time integral.