Measuring barometric pressure with a manifold pressure sensor in a microprocessor based engine control system
A microprocessor based electronic engine control system is described for an internal combustion engine, a method for updating the stored ambient pressure signal by measuring the ambient barometric pressure during engine operation using a manifold pressure sensor. The method consists of: generating timing signals indicating the rotational position of an engine member and including a signal indicating a predetermined rotational position in the rotation of the engine member; generating a pressure signal from the manifold pressure sensor representing the pressure surrounding the sensor in response to the predetermined rotational position; reading the value of ambient barometric pressure stored in the memory of the microprocessor; comparing the value of the barometric pressure stored in the memory of the microprocessor and the value of the pressure signal; increasing the value of the barometric pressure by one unit to generate a new barometric pressure value when the value of the pressure signal is greater than the value of the barometric pressure; comparing the new barometric pressure value with a predetermined fixed constant representing the maximum barometric pressure; and storing in the memory of the microprocessor either the new barometric pressure value if equal to or less than the fixed constant or the value of the maximum barometric pressure if the new barometric pressure value is greater than the fixed constant.
- Assignee:
- Allied Corp., Morris Township, Morris County, NJ
- Patent Number(s):
- US 4600993
- OSTI ID:
- 5550661
- Resource Relation:
- Patent File Date: Filed date 27 May 1983
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
INTERNAL COMBUSTION ENGINES
COMPUTERIZED CONTROL SYSTEMS
PRESSURE MEASUREMENT
MEMORY DEVICES
MICROPROCESSORS
POSITIONING
PRESSURE GAGES
READOUT SYSTEMS
ROTATION
SIGNALS
TIME MEASUREMENT
COMPUTERS
CONTROL SYSTEMS
ELECTRONIC CIRCUITS
ENGINES
HEAT ENGINES
MEASURING INSTRUMENTS
MICROELECTRONIC CIRCUITS
MOTION
330100* - Internal Combustion Engines