The invention discloses a high-pressure oil passage by-pass
economizer of a diesel-powered car, comprising a circuit
control switch, a high-pressure oil passage by-pass one-way valve, an oil return cylinder, an air cylinder and an
electromagnetic valve. The circuit
control switch and the
electromagnetic valve that is connected with an
air compressor can automatically select an air
throttle or set a speed and even set whether the
electromagnetic valve operate or not under a
throttle normally closed condition; the electromagnetic valve is connected with the air cylinder to drive the oil return cylinder connected to the air cylinder; two to six the
high pressure oil passage by-pass one-way valves corresponding to
skew notches on a push rod are arranged on one side of an oil cylinder sleeve at intervals; the
high pressure oil passage by-pass one-way valves are serially connected between a
high pressure oil
pipe and an oil
injector via a three-way high pressure oil
pipe connector; when the push rod is pushed to eject a stepped spool, the high pressure diesel is released through a stepped hole to the oil cylinder and flows back to the
oil tank, indirectly blocking
oil supply to a deactivation cylinder of an engine; when the push rod in the oil return cylinder returns back, then the stepped spool is restored, the oil return is turned off, and the
oil supply to the engine of the car is recovered. The invention has advantages of low cost, high degree of
automation, safety, reliability, significant oil economization effect and the like, and is specially suitable for diesel-powered cars.