Measuring barometric pressure with a manifold pressure sensor in

Details Measuring barometric pressure with a manifold pressure sensor in Measuring barometric pressure with a manifold pressure sensor in

1983-05-27

1986-07-15

Gruber, Felix D.

Boots, shoes, and leggings

123412, 123416, 123488, 36443110, 364558, F02D 3500, F02D 4126, F02P 515

Patent

active

046009930

ABSTRACT:
A method of measuring barometric pressure with a manifold pressure sensor (62) in a microprocessor based engine control system utilizes known engine operating conditions to interrogate the sensor. Also on engine turn-off, a power latch signal (158) is generated to delay power removal until the throttle valve (160) is driven open and the pressure sensor (62) is interrogated for its value. This value at this time is the ambient or barometric value of pressure. This value is stored in the microprocessor's (26, 28) memory (84, 86) and maintained by means of a standby voltage (80). During engine operation, the pressure sensor (62) is interrogated and value of the stored barometric pressure is changed by one unit of pressure if the stored and measured values are unequal.

REFERENCES:
patent: 4157699 (1979-06-01), Mori
patent: 4271797 (1981-06-01), McCarbery
patent: 4362133 (1982-12-01), Malik
patent: 4372274 (1983-02-01), Takase
patent: 4385606 (1983-05-01), Hattori et al.
patent: 4442812 (1984-04-01), Mizuno et al.

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