Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – With indicator or control of power plant
Reexamination Certificate
2002-11-19
2004-11-09
Vo, Hieu T. (Department: 3747)
Data processing: vehicles, navigation, and relative location
Vehicle control, guidance, operation, or indication
With indicator or control of power plant
C701S114000, C701S115000, C123S361000, C123S399000
Reexamination Certificate
active
06816772
ABSTRACT:
CROSS REFERENCE TO RELATED APPLICATION
This application is based on and incorporates herein by reference Japanese Patent Application No. 2002-54089 filed on Feb. 28, 2002.
FIELD OF THE INVENTION
The present invention relates to an electronic throttle control system that has an operation monitoring function.
BACKGROUND OF THE INVENTION
In an electronic throttle control system for an internal combustion engine, the throttle control operation is monitored by determining whether an actual throttle angle (opening position) or a calculated throttle angle is within a predetermined range defined by an upper limit value and a lower limit value. Those limit values are stored in a memory. If the limit values become abnormal due to some defects or failures in the memory, the monitoring cannot be attained properly. Particularly, if flash memory is used to store the limit values, it is more subjected to aging and hence the limit values tend to become abnormal. As a result, determination of abnormality of the throttle control is delayed. If the memory is monitored by the check-sum operation for each calculation of the throttle angle to detect the abnormality, the processing load of the computer increases thereby limiting calculation time of the computer for the throttle control, fuel control and the like.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide an electronic throttle control system, which is capable of monitoring an electronic throttle control operation without increasing processing load of a computer.
According to the present invention, an electronic throttle control system has a memory and a computer. The memory stores various data. The computer calculates a target throttle angle and a throttle angle monitor value from data stored in the memory. The computer performs an electronic throttle control and monitors the electronic throttle control to determine whether an actual throttle angle is within a predetermined range defined by the monitor value. A characteristic of the throttle control value or the monitor value data is that it is defined in a way that it logically causes the throttle angle to be controlled in a throttle closing direction, when a memory retention abnormality occurs.
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