Vehicular controller

• US 20030088358A1
• Filed: 10/31/2002
• Published: 05/08/2003
• Est. Priority Date: 11/02/2001
• Status: Active Grant

• Current Assignee: DENSO Corporation
• Original Assignee: DENSO Corporation
• Inventors: Takeuchi, Yoshiharu
• Granted Patent: US 6,990,404 B2
• Time in Patent Office: Days
• US Class Current: 701/114
• CPC Class Codes: F02D 41/266 the computer being backed-up or assisted by another circuit, e.g. analogue

Abstract

A vehicular engine control unit has multi-CPU configuration. A main CPU executes a control processing subject to a monitoring processing and transmits monitoring data to a sub-CPU. The sub-CPU executes the monitoring processing based on the received monitoring data. The control processing executed by the main CPU and a control characteristic may be changed or modified in accordance with an engine capacity, a vehicle equipment or the like. Similarly, the monitoring data stored in a memory connected with the main CPU is also changed in accordance with the control characteristic and the like. Therefore, the sub-CPU can be commonly used for several arrangements or the control characteristics of the main CPU.

Claims

1. A vehicular controller for controlling a vehicular component, the vehicular controller comprising:

a control CPU that executes control processing of the vehicular component;

a monitoring CPU that executes monitoring processing of the control CPU;

a communication device provided between the control CPU and the monitoring CPU; and

a memory device that is connected with the monitoring CPU and stores a monitoring data for monitoring the control CPU, wherein

the control CPU transmits the monitoring data to the monitoring CPU, and

the monitoring CPU updates the monitoring data stored in the memory device with the monitoring data transmitted from the control CPU when the monitoring data stored in the memory device is not correct.

2. The vehicular controller according to claim 1, wherein the communication device includes a buffer for temporally storing the monitoring data received from the control CPU, and the monitoring CPU moves the monitoring data in the buffer to the memory device.

3. The vehicular controller according to claim 1, wherein the control CPU executes an engine control for an engine.

4. The vehicular controller according to claim 1, wherein the control CPU executes an engine control for an engine and a failsafe control that control an engine torque under an abnormal status, and the monitoring CPU monitors status of the failsafe control executed in the control CPU.

5. The vehicular controller according to claim 1, wherein the control CPU transmits all of the monitoring data at an initial communication event caused by a power on, and transmits a divided part of the monitoring data at a periodical communication event.

6. The vehicular controller according to claim 1, wherein the monitoring CPU requests the control CPU to transmit the monitoring data if the monitoring data stored in the memory is not correct, and the control CPU transmits the monitoring data to the monitoring CPU in response to the request from the monitoring CPU.

7. The vehicular controller according to claim 2, wherein the monitoring CPU suspends the following processing if the monitoring data stored in the memory is not correct after receiving the monitoring data in an initial communication event caused by a power on.

8. The vehicular controller according to claim 2, wherein the monitoring CPU resets the control CPU if the monitoring data stored in the memory is not correct after receiving the monitoring data in an initial communication event caused by a power on.

9. The vehicular controller according to claim 1, wherein the memory device is a non-volatile memory that is capable of keeping memory without power supply.

10. The vehicular controller according to claim 1, wherein the control CPU transmits the monitoring data and a check data that enables a determination whether or not the monitoring data is correct.