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Control system

  • US 4,628,885 A
  • Filed: 02/13/1985
  • Issued: 12/16/1986
  • Est. Priority Date: 03/10/1984
  • Status: Expired due to Fees
First Claim
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1. An electronic control system for a solenoid operated actuator of a fuel system of an internal combustion engine comprising a semi-conductor device arranged in use to be connected in a series circuit with the solenoid of the actuator across a source of electric supply to control current flow in the solenoid, a feedback means for providing a feedback signal indicative of an operating parameter of said actuator, a drive circuit for said semi-conductor device, said drive circuit having a control signal input to which can be applied a control pulse, said drive circuit producing a series of pulses whereby the semi-conductor device will be switched on and off to control the current flow in said solenoid, an AND gate disposed intermediate said drive circuit and said semi-conductor device and which when an enable signal is applied thereto, passes said series of pulses to the semi-conductor device, enable signal generating means for generating said enable signal of predetermined time duration and an electronic control unit which receives said feedback signal and supplies said control pulse to the drive circuit and a trigger signal to said enable signal generating means, the control unit receiving other signals so that it can determine and control an amount of fuel to be supplied to the engine, the control unit acting in the event of an internal fault or in the event that said feedback signal falls outside prescribed limits, to discontinue supply at least of the trigger signal to said enable signal generating means whereby supply of said series of switching pulses to the semi-conductor device will be halted.

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