Emergency operation device for microcomputer-controlled systems
First Claim
1. An emergency operation device for a microcomputer-controlled system, in particular for idling charge regulation of an internal combustion engine in motor vehicles, comprising:
- a microcomputer having signal inputs corresponding to operating parameters and further having a signal output for emitting first control signals (Ui) generated by said microcomputer and a failsafe output (Uc) for emitting regular pulses serving as failsafe pulses for continuous monitoring and control of a system output during normal operation of said system,a circuit means for monitoring occurrence of said regular pulses,a function generator for providing second control signals,a logic switching means responsive to said circuit means for supplying an end stage control signal to an end stage of said system, said end stage control signal being selectively chosen from between those of said first control signals and those of said second control signals,said circuit means being operatively arranged for providing a third control signal (UFS) comprising a failsafe signal for actuating said logic switching means and further providing a reset signal for said microcomputer in the event of a malfunction,at least one of said first, second and third control signals being selectable to serve as an emergency operation signal (UN) to trigger said end stage, andsaid emergency operation signal derived from said failsafe signal is free of synchronization with any of said operating parameters of said engine.
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Abstract
An emergency operation device for a microcomputer-control system, in particular an idling charge regulating means in a motor vehicle, has a microcomputer which has both a signal output for emitting control signals generated by the microcomputer and a further output for emitting regular failsafe pulses. A failsafe circuit monitors the regular occurrence of the failsafe pulses. Upon the occurrence of a failsafe signal from the failsafe circuit, a reset input of the microcomputer is actuated, and at the same time the system is supplied via a logic block with an emergency operation signal from an emergency operation function generator.
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Citations
19 Claims
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1. An emergency operation device for a microcomputer-controlled system, in particular for idling charge regulation of an internal combustion engine in motor vehicles, comprising:
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a microcomputer having signal inputs corresponding to operating parameters and further having a signal output for emitting first control signals (Ui) generated by said microcomputer and a failsafe output (Uc) for emitting regular pulses serving as failsafe pulses for continuous monitoring and control of a system output during normal operation of said system, a circuit means for monitoring occurrence of said regular pulses, a function generator for providing second control signals, a logic switching means responsive to said circuit means for supplying an end stage control signal to an end stage of said system, said end stage control signal being selectively chosen from between those of said first control signals and those of said second control signals, said circuit means being operatively arranged for providing a third control signal (UFS) comprising a failsafe signal for actuating said logic switching means and further providing a reset signal for said microcomputer in the event of a malfunction, at least one of said first, second and third control signals being selectable to serve as an emergency operation signal (UN) to trigger said end stage, and said emergency operation signal derived from said failsafe signal is free of synchronization with any of said operating parameters of said engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification