Control device for a diesel internal combustion engine

Details Control device for a diesel internal combustion engine Control device for a diesel internal combustion engine

Filed on

1988-02-23

Date issued

1990-02-27

Examiner

Miller, Carl Stuart

Patent Class

Internal-combustion engines

SubClass

Charge forming device

SubSubClass

Fuel injection system

Other Related Categories

123359, 123198DB, F02M 3900

Type

Patent

Status

active

Patent number

049036700

Description

ABSTRACT:
A diesel internal combustion engine 1 has an air intake 2, an injection pump 3 and an exhaust pipe 4. In the fuel injection line 7 is arranged an electromagnetic shut-off valve 8, which closes the fuel supply when the "ignition" switch 10 is turned off, in order to bring the engine 1 to an immediate halt. In the exhaust pipe 4 is arranged a lambda lean probe 12, which feeds to a comparator electronics system 14 a signal corresponding to the oxygen content of the exhaust gas; this signal is compared in the comparator circuit with a lambda nominal value. If an excess quantity of fuel has been injected, for example, due to a fault in the injection system the value detected by the lambda probe 12 will fail to reach the nominal value, whereupon the comparator electronic system 14 activates a switch 15 in the control line 9 of the shut-off valve 8. The current supply to the shut-off valve 8 is interrupted and the fuel supply to the engine 1 is shut off. In this way unintentional acceleration of the engine as a result of faulty injection of an excess quantity of fuel, is prevented.

REFERENCES:
patent: 4023358 (1977-05-01), Maurer
patent: 4077381 (1978-03-01), Firey
patent: 4083337 (1978-04-01), Hattori
patent: 4498443 (1985-02-01), Hasegawa
patent: 4509480 (1985-04-01), Kull
patent: 4515125 (1985-05-01), Buck
patent: 4648370 (1987-03-01), Kobayashi
patent: 4662335 (1987-05-01), Kleeblatt
patent: 4697567 (1987-10-01), Sawaad
patent: 4715344 (1987-12-01), Tomisawa

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