Self-testing control system for an internal combustion engine

Measuring and testing – Vehicle chassis – Steering

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340 52F, G01M 1500

Patent

active

043173640

ABSTRACT:
An internal combustion engine self-testing control system has a microcomputer, which includes a memory unit pre-programmed with a program for testing the microcomputer. The system is so programmed as to be able to test itself by using an indicator to show the system state before controlling actuators that affect the engine operating values. That is, since it is impossible to test the system merely by observing the indicator states produced by the system, one or more test processes are added before controlling the actual engine operating values. In one example, the test timing is controlled by a power signal generated when the power supply is turned on, a start signal is generated when a starting switch is turned on (while the engine is being cranked), and a revolution indicating signal is generated when the engine is rotating. In this case, the checking is carried out somewhere in the interval between instigating of the power signal and the end of start signal, between the beginning of the start signal and the end of the start signal, or somewhere between instigation of the power signal and the beginning of the start signal, etc. Therefore, by observing the indicator states in the system whenever the power switch and the starting switch are turned on, it is possible to readily test the control system for an internal combustion engine.

REFERENCES:
patent: 4122720 (1978-10-01), Podl
patent: 4128885 (1978-12-01), Valek et al.
patent: 4234921 (1980-11-01), Kinoshita et al.

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