Control apparatus for diesel engine
AssigneesNippondenso Co., Ltd., Toyota Jidosha Kogyo Kabushiki Kaisha
InventorsKaoru Taira, Teruo Sato, Yoshiya Ishii, Yukinori Miyata, Katashi Okamoto
Life of this patent
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Abstract
The present invention discloses an improved control apparatus for a Diesel engine. The control apparatus includes an auxiliary intake air throttle device as well as a conventional main throttle device, which is actuable and throttles intake air only during engine idling and light-load operation in order to reduce the engine noise. The apparatus is further provided with a fuel metering device for ensuring the precise control on fuel metering when the auxiliary intake air throttle device is actuated so that the engine stall may be prevented.
Claims7
A control apparatus for a Diesel engine comprising:
- a fuel injection pump for injecting fuel to an engine, said fuel injection pump having a control rack for controlling the amount of the fuel injected to the engine;
- a main throttle valve installed in an intake manifold of the engine for controlling the speed of intake air flow;
- venturi means disposed in the intake manifold of the engine for permitting intake air to flow therethrough with the speed controlled by said main throttle valve;
- an auxiliary throttle valve installed in the intake manifold for throttling intake air in its throttling position;
- actuating means connected to said auxiliary throttle valve for bringing the same into said throttling position only during low load operation of the engine;
- fuel metering means for controlling said control rack and hence the amount of fuel injected to the engine, said fuel metering means having a housing and a deflectable member coupled together for forming therebetween a pressure chamber to be supplied with the negative pressure, said deflectable member being connected to said control rack to control said control rack in response to the negative pressure in said pressure chamber;
- and
- selector valve means operatively connected to said auxiliary throttle valve for transmitting the negative pressure in said venturi means to said pressure chamber of said fuel metering means when said auxiliary throttle valve is opened and for transmitting the negative pressure in said intake manifold downstream of said auxiliary throttle valve to said pressure chamber of said fuel metering means when said auxiliary throttle valve is in its throttling position.
Dependencies are inferred from the claim text.