Electronic injection-amount regulating apparatus in auto-ignited internal combustion engines

US4279229A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Herbert Arnold · Eberdingen, DE
• Gerd Gerhards · Hemmingen, DE

Key dates

• Filing date: Jul 26, 1978
• Grant date: Jul 21, 1981
• Expiry date: Jul 26, 1998

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/22
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electronic injection-amount regulating apparatus in auto-ignited internal combustion engines in which the injection amount can be regulated by means of a regulator preferably having a PID characteristic and in which the injection amount is apportioned via a solenoid actuator and which includes a safety switching arrangement having an integral timing circuit resettable at each initiation of a control impulse for the solenoid actuator to prevent damage to the solenoid actuator in case of failure of the control signal, as well as a switching circuit for engine starting enhancement in a predetermined rpm range having as its most significant concept a series switching arrangement which includes a low-pass filter and a controllable threshold switch.