Method and device for operating a motor vehicle

• US 9,683,494 B2
• Filed: 03/05/2015
• Issued: 06/20/2017
• Est. Priority Date: 03/06/2014
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Strauss, Steffen, Poertner, Nikolas
• Primary Examiner(s): Tarcza, Thomas
• Assistant Examiner(s): Dunn, Alex C
• Application Number:
  US14/639,623
• Publication Number:
  US 20150252739A1
• Time in Patent Office: 838 Days
• CPC Class Codes: B60K 6/485 Motor-assist type
• 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 10/08 including control of electric propulsion units, e.g. motors or generators
• 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 30/18054 at stand still, e.g. engine in idling state hill holding B60W30/18118
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60W 30/192 Mitigating problems related to power-up or power-down of the driveline, e.g. start-up of a cold engine
• CPC Class Codes: B60W 50/0205 Diagnosing or detecting failures; Failure detection models
• CPC Class Codes: F02D 2250/24 by using an external load, e.g. a generator
• CPC Class Codes: F02D 29/02 peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
• 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: F02N 11/0829 related to special engine control, e.g. giving priority to engine warming-up or learning
• CPC Class Codes: Y02T 10/40 Engine management systems
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method is provided for carrying out a diagnosis of an internal combustion engine of a motor vehicle wherein, during the diagnosis, at least partially an additional drive machine, particularly an electric motor, generates a torque, and thereby changes an operating point of the internal combustion engine.

Claims

1. A method for carrying out a diagnosis of an internal combustion engine of a motor vehicle, comprising:

during the diagnosis, causing at least partially an additional drive machine to generate a torque, and thereby change an operating point of the internal combustion engine, wherein the internal combustion engine is brought to a standstill when the diagnosis is terminated.

2. The method as recited in claim 1, wherein:

the torque is applied to the internal combustion engine, and thereby changes the operating point of the internal combustion engine, and

the torque is generated by the additional drive machine and applied to the internal combustion engine when a mechanical coupling between the internal combustion engine and a drive shaft is disengaged by opening a clutch.

3. The method as recited in claim 2, wherein the additional drive machine is able to be driven by motor, and wherein the torque supports a rotational motion of the internal combustion engine.

4. The method as recited in claim 3, wherein:

the diagnosis is carried out at least partially in a passive operation of the internal combustion engine, and

during the passive operation;

a mechanical clutch of the internal combustion engine to wheels of the motor vehicle is opened, and

the additional drive machine drives the internal combustion engine.

5. The method as recited in claim 2, wherein the additional drive machine changes the operating point of the internal combustion engine in such a way that the diagnosis is able to be carried out.

6. The method as recited in claim 2, wherein, during the diagnosis, air is supplied to the internal combustion engine.

7. The method as recited in claim 2, wherein, during the diagnosis, fuel is injected into the internal combustion engine.

8. The method as recited in claim 2, wherein, during the diagnosis, a fuel/air mixture is ignited in the internal combustion engine.

15. The method as recited in claim 2, wherein the additional drive machine includes an electric motor.

9. A method for carrying out a diagnosis of an internal combustion engine of a motor vehicle, comprising:

during the diagnosis, causing at least partially an additional drive machine to generate a torque, and thereby change an operating point of the internal combustion engine, wherein the internal combustion engine is transferred to an active mode when the diagnosis is terminated.

11. The method as recited in claim 9, wherein during the transferring of the internal combustion engine into the active mode, a driving torque, generated by the additional drive machine, is reduced in such a way that a total torque, which is transmitted by the internal combustion engine and the additional drive motor to the wheels, is constant.

10. A method for carrying out a diagnosis of an internal combustion engine of a motor vehicle, comprising:

during the diagnosis, causing at least partially an additional drive machine to generate a torque, and thereby change an operating point of the internal combustion engine, wherein the internal combustion engine is transferred to an active mode when a driver command is ascertained to start the internal combustion engine.

12. A computer program that when executed carries out a method for carrying out a diagnosis of an internal combustion engine of a motor vehicle, the method comprising:

during the diagnosis, causing at least partially an additional drive machine to generate a torque, and thereby change an operating point of the internal combustion engine, wherein the internal combustion engine is transferred to an active mode when a driver command is ascertained to start the internal combustion engine.

13. A non-transitory machine-readable storage medium on which a computer program is stored and that when executed carries out a method for carrying out a diagnosis of an internal combustion engine of a motor vehicle, the method comprising:

during the diagnosis, causing at least partially an additional drive machine to generate a torque, and thereby change an operating point of the internal combustion engine, wherein the internal combustion engine is transferred to an active mode when a driver command is ascertained to start the internal combustion engine.

14. A control unit that carries out a method for carrying out a diagnosis of an internal combustion engine of a motor vehicle, the method comprising:

during the diagnosis, causing at least partially an additional drive machine to generate a torque, and thereby change an operating point of the internal combustion engine, wherein the internal combustion engine is transferred to an active mode when a driver command is ascertained to start the internal combustion engine.