Method for the diagnosis of, and control device for controlling a motor vehicle

• US 20070265742A1
• Filed: 05/08/2007
• Published: 11/15/2007
• Est. Priority Date: 05/08/2006
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Bethmann, Andreas, Thiel, Christof
• Granted Patent: US 7,953,527 B2
• Time in Patent Office: Days
• US Class Current: 701/29
• CPC Class Codes: G07C 5/0808 Diagnosing performance data testing of vehicles G01M17/00; testing of electrical installation on vehicles G01R31/005

Abstract

A method for diagnosing a motor vehicle and a control device for controlling a motor vehicle, a plurality of characteristic values, which are used for controlling the motor vehicle, being adapted. The adapted characteristic values are compared in each case to a threshold value, and an error message is generated if the adapted characteristic value goes beyond the threshold value. Normalized characteristic values are formed by a normalization, and a possibly faulty component of the motor vehicle is identified by a joint observation of a plurality of normalized characteristic values.

Claims

1. A method for a diagnosis of a motor vehicle comprising:

adapting a plurality of characteristic values which are used for a control of the motor vehicle;

comparing the adapted characteristic values in each case to at least one threshold value;

providing an error message if the adapted characteristic value goes beyond the threshold value;

forming normalized characteristic values by a normalization from the adapted characteristic values; and

utilizing a plurality of normalized characteristic values jointly for detecting a possibly faulty component of the motor vehicle.

2. The method according to claim 1, wherein the adapted characteristic value, an initial value for the characteristic value and the threshold value are taken into account for the normalization.

3. The method according to claim 2, wherein the at least one threshold value is a fixed value which is read out from a memory.

4. The method according to claim 2, wherein the at least one threshold value is a function of operating states of the motor vehicle, and the normalization of the adapted characteristic value takes place as a function of the operating states of the motor vehicle.

5. The method according to claim 1, further comprising, in response to a detection of a possibly faulty component, running an additional test program by the control in order to recognize a cause of a possible fault.

6. The method according to claim 1, wherein the method for the diagnosis is initiated in a repair shop.

7. The method according to claim 1, wherein the method for the diagnosis is triggered by an error message.

8. A control device for controlling a motor vehicle, comprising:

an arrangement for adapting a plurality of characteristic values;

an arrangement for comparing the adapted characteristic values in each case to at least one threshold value;

an arrangement for generating in each case an error message if the adapted characteristic value goes beyond the threshold value;

an arrangement for performing a normalization of the adapted characteristic values; and

an arrangement for using a plurality of normalized characteristic values jointly for a detection of a possibly faulty component of the motor vehicle.