Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kaisha

Masashi Chino

Toru Hashimoto

Akira Takahashi

Minoru Nishida

Hideaki Katashiba

Mitsuhiro Miyake

Masato Takabatake

Tohru Hashimoto

An exhaust gas cleaning device for controlling the air-to-fuel ratio of the air-fuel mixture supplied to an internal combustion engine (1) provided with a catalytic converter (14) disposed in the exhaust pipe (13). The air-to-fuel ratio is oscillated around the central level of the integral control or proportional plus integral feedback control signal based on the output of an air-to-fuel ratio sensor (12); the amplitude of oscillation and the proportional control amount are, or alternatively, the frequency of the oscillation is, varied in accordance with the operating condition of the engine.

Exhaust gas cleaning device for an internal combustion engine

An engine control system for controlling an engine in response to an output from a temperature sensor for detecting a coolant temperature of the engine, comprising temperature sensor output monitoring device for monitoring an output of the temperature sensor during operation of the engine, temperature sensor fail judging device for judging the temperature sensor to be failed when the temperature sensor output monitoring device does not detect for a predetermined length of time a change in output of the temperature sensor corresponding to an increase in coolant temperature while the temperature sensor is outputting a signal corresponding to the coolant temperature during the operation of the engine, and dummy signal outputting device for outputting a dummy signal corresponding to a predetermined temperature in place of an output signal from the temperature sensor when the temperature sensor is judged as failed by the temperature sensor fail judging device, which, in addition to engine control with a normal temperature sensor, can detect a malfunction of the temperature sensor due to a short circuit, an open circuit, or a resistance increase to fix the temperature sensor output, thereby providing positive engine control, and enables fixing of the engine speed to a desired value in the idle rotation speed control, suppression of an unnecessary fuel enrichment in the fuel control, and suppression of an advance in ignition timing in the ignition control.

Fail safe device for temperature sensor

A sensor for detecting a number of revolutions of a rotary shaft is provided which comprises a ring magnet secured to the outer peripheral surface of the rotary shaft, the number of revolutions of which is to be detected, a Hall IC arranged near the outer peripheral surface of the rotary shaft, for detecting the magnetism of the ring magnet. The ring magnet has one circumferential half of the outer peripheral surface thereof magnetized to serve as the north pole and the other circumferential half of the outer peripheral surface thereof magnetized to serve as the south pole.

Detector device for simultaneously detecting both the direction and

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Tokyo, Japan

Masashi Chino