Failsafe for an engine control

Details Failsafe for an engine control Failsafe for an engine control

1982-01-13

1985-01-01

Cox, Ronald B.

Internal-combustion engines

Charge forming device

Fuel injection system

123399, 123357, 123359, 123397, 123351, F02B 300, F02D 104, F02D 1110

Patent

active

044911122

ABSTRACT:
A failsafe system for an engine-control servomotor compares a servomotor command signal to a feedback signal from the servomotor. When the magnitude of the difference between the two signals is greater than a predetermined value for a predetermined time, the failsafe system shuts down the servomotor or performs some other engine shut-down procedure. The failsafe system includes a comparator for comparing the two signals, the output of which leads to two other op-amp-type comparators connected in parallel, which work on negative or positive outputs of the first-mentioned comparator, respectively. Each of the later comparators receives a reference voltage input against which to compare the output of the first-mentioned comparator. Their outputs lead parallelly to time-delay circuits which check for a positive output for a predetermined length of time by a well-known capacitor-integration technique.

REFERENCES:
patent: 4098242 (1978-07-01), Anderson
patent: 4312315 (1982-01-01), Takase
patent: 4393833 (1983-07-01), Mann

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