FIELD: mechanical engineering diesel engine.
SUBSTANCE: invention relates to diesel engines operating at higher compression ratio up to 80. Proposed diesel engine contains one cylinder with piston, connecting rod, crankshaft with its speed sensor, cylinder head with intake and exhaust valves and intake manifold with throttle valve. Engine is furnished with vacuum sensor installed after throttle valve in intake manifold, engine temperature transmitter, ambient temperature and pressure transmitters, throttle valve drive, engine power control unit (accelerator pedal) position pickup, fuel injection device and electronic control unit. Inputs of electronic control unit are connected with vacuum sensor, engine temperature transmitter, ambient temperature and pressure transmitters, crankshaft speed sensor and accelerator pedal position pickup. Output of electronic control unit is connected with fuel feed device, starting and idling air rate controller drive and throttle valve drive. Engine is furnished with vacuum pump with drive, starting and idling air rate controller with drive. Input of vacuum pump and output of starting and idling air rate controller communicate with intake manifold of engine. Vacuum pump drive and starting and idling air rate controller drive are connected with outputs of electronic control unit which is made to form signal to drive of vacuum pump for cutting in the pump after starting to provide removal of air from intake manifold when fuel injection device, starting and idling air rate controller and throttle valve are closed. When vacuum in intake manifold reaches preset value depending on values of compression ratio of said engine, its temperature, ambient temperature and pressure, electronic control unit, by signal from vacuum sensor, forms signal to starter for cranking the crankshaft and forms signals to fuel injection device and to starting and idling air rate controller to provide delivery of air and fuel into cylinder. In period from beginning of cranking to engine starting, electronic control unit forms signal to starting and idling air rate controller to limit air flow rate and provide required level of vacuum in intake manifold. After starting of engine, electronic control unit forms signal to cut out vacuum pump and shifts starting and idling air rate controller to idling position. With engine operating from idling to maximum speed conditions, depending on compression ratio of engine, its temperature and ambient temperature and pressure, crankshaft speed, electronic control unit, by signals from accelerator pedal position pickup and vacuum sensor, forms signal to throttle valve to change its position, thus limiting filling of cylinder with air.
EFFECT: improved reliability of starting and operation of engine.
5 cl, 1 dwg
