Altitude responsive turbocharger control system
A turbocharger control system has a waste gate operative to cause engine exhaust gases to bypass the turbo-charger to protect the engine when the supercharging pressure exceeds a predetermined pressure level. A pressure modulator is provided to mix pressures derived from points upstream and downstream of a compressor to produce a controlling pressure which is modulated to be of a pressure level between the compressor-upstream and downstream pressures and which is also adjusted as a function of the atmospheric pressure. A waste gate actuator compares the supercharging pressure and the controlling pressure to control the operation of the waste gate. When a motor vehicle equipped with the system is operated at high altitude where the atmospheric pressure is lower than that obtained at a low altitude, the controlling pressure is adjusted to be substantially the same as the controlling pressure obtained at the low altitude, whereby the waste gate is opened only at a predetermined pressure level of the supercharging pressure to assure a good engine operability.
- Assignee:
- Hitachi Ltd. (Japan)
- Patent Number(s):
- US 4468928
- OSTI ID:
- 6312115
- Resource Relation:
- Patent Priority Date: Priority date 14 Jun 1982, Japan; Other Information: PAT-APPL-388218
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
FUEL SYSTEMS
CONTROL EQUIPMENT
INTERNAL COMBUSTION ENGINES
ALTITUDE
ATMOSPHERIC PRESSURE
COMPRESSORS
DESIGN
EXHAUST GASES
PRESSURE CONTROL
SUPERCHARGERS
CONTROL
ENGINES
EQUIPMENT
FLUIDS
GASEOUS WASTES
GASES
HEAT ENGINES
WASTES
330603* - Vehicle Design Factors- Engine System