Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1980-12-12
1983-01-25
Burns, Wendell E.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
123571, F02M 2506
Patent
active
043697534
ABSTRACT:
A diesel engine includes an air intake system, an exhaust system, and an exhaust gas recirculation conduit which leads from the exhaust system to the intake system. An exhaust gas recirculation control valve, which includes a first diaphragm chamber, is mounted in the exhaust gas recirculation conduit so as to regulate the flow of exhaust gas through it. The exhaust gas recirculation control valve is controlled by a controlling fluid pressure supplied to its first diaphragm chamber. A fluid pressure control valve receives supply of fluid pressure and produces this controlling fluid pressure for the exhaust gas recirculation control valve, according to the amount of displacement of a movable member which moves according to the amount of diesel fuel being supplied to the diesel engine. In a particular embodiment, a throttle valve is fitted to the intake system upstream of the point where the exhaust gas recirculation conduit joins to it, and is moved by a fluid pressure actuated diaphragm device including a second diaphragm chamber which is also supplied with the same controlling fluid pressure as is the first diaphragm chamber. Also, in various constructions, valves or the like for cutting off supply of the controlling fluid pressure to the first and second diaphragm chambers when the temperature of the engine is low, and when the engine revolution speed is high, may be provided. A system may also be provided for, when the engine rotational speed is low, either reducing the value of the controlling fluid pressure, or alternatively for cutting off supply of it to the second diaphragm chamber only.
REFERENCES:
patent: 3916857 (1975-11-01), Naito et al.
patent: 4181109 (1980-01-01), Wake et al.
patent: 4280470 (1981-07-01), Ueda
patent: 4304208 (1981-12-01), Etoh et al.
Burns Wendell E.
Toyota Jidosha Kogyo Kabushiki Kaisha
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