Process and device for controlling an internal combustion engine

• US 5,550,740 A
• Filed: 12/05/1994
• Issued: 08/27/1996
• Est. Priority Date: 12/04/1993
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Sassen, Klaus, Hall, Dieter
• Primary Examiner(s): WOLFE JR, WILLIS RAY
• Application Number:
  US08/349,224
• Time in Patent Office: 631 Days
• Field of Search: 123/417, 123/480, 123/339.23, 123/571, 364/431.01, 364/431.04, 364/431.05, 73/116, 73/117.3, 324/379, 324/384
• US Class Current: 701/99
• 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: G01M 15/05 by combined monitoring of two or more different engine parameters
• CPC Class Codes: Y02T 10/40 Engine management systems

Abstract

A process and a device for controlling an internal combustion engine in which a control unit is temporarily connected to an external tester via an interface. At least one storage device of the control unit is configured as first and second storage elements. The first storage element is supplied with data corresponding to a signal transmitted from the tester. The second storage element is supplied with data from the control unit. Either the contents of the first storage element or the contents of the second storage element are selected, with the contents of the second storage element being selected when the contents of the first storage element have an unallowable value.

Claims

1. A method for controlling an internal combustion engine, comprising the steps of:

coupling a control unit to a tester via an interface;

storing, in a first storage element, data corresponding to control signals transmitted by the tester;

storing, in a second storage element, data from the control unit;

determining whether the data stored in the first storage element is allowable;

selecting the data stored in the first storage element if the data stored in the first storage element is allowable, otherwise selecting the data stored in the second storage element; and

controlling the engine using the selected data.

2. The method according to claim 1, wherein the step of controlling the engine includes the step of controlling an output module using the selected data.

3. The method according to claim 1, further comprising the step of using the selected data as a desired value for a control circuit.

4. The method according to claim 1, wherein the data corresponding to control signals transmitted by the tester is generated by converting the control signals transmitted by the tester into signals compatible with the control unit.

5. The method according to claim 1, wherein the tester transmits the control signals and control times for at least one actuator.

6. The method according to claim 1, wherein the tester transmits at least one desired value for at least one control circuit.

7. The method according to claim 1, wherein the tester provides a functional chain.

8. The method according to claim 1, wherein no error monitoring is performed if the data stored in the first storage element is selected.

9. A control unit for controlling an internal combustion engine, comprising:

an interface for coupling the control unit to a tester;

at least one storage device configured as first and second storage elements;

means for supplying the first storage element with first data corresponding to at least one control signal transmitted by the tester;

means for supplying the second storage element with second data from the control unit; and

means for selecting the first data if the first data is allowable, otherwise selecting the second data,

wherein the selected data is used to control the engine.