Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-12-19
1991-02-26
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
324399, 36443107, F02M 5100
Patent
active
049953656
ABSTRACT:
A microphone serving as a pressure gradient sensor is connected by a pressure transmission tube to the collecting duct of the exhaust manifold of an internal combustion engine for detecting the pressure shock waves released by the opening of the exhaust valves of the engine when combustion occurs in the respective cylinders. An evaluation circuit connected to the sensor detects when such a pressure wave is missing, indicating a failure of ignition in the cylinder and reports the cylinder in which such failure occurs. The system has the advantage that failure of the fuel to ignite is detected and when there is a normal spark. The counter in the evaluation system identifies the cylinder when a failure has occured. The sensor can be disconnected under control of the crankshaft or the camshaft from the evaluation circuit except during brief intervals beginning just before an exhaust valve opens, in order to improve reliability.
REFERENCES:
patent: 4704685 (1987-11-01), Martinsons et al.
patent: 4821194 (1989-04-01), Kawamura
patent: 4918389 (1990-04-01), Schleupen et al.
Denz Helmut
Herden Werner
Nelli Raymond A.
Robert & Bosch GmbH
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