Fuel metering solenoid pneumatic valve failure

discussion: fuel metering solenoid pneumatic valve failure, fire engine can play? Can play catch fire, have influence on engine performance?
when the fuel metering electromagnetic (pneumatic valve failure For example, pull the plug) , fire engine can you play, not all, should according to specific models and consideration, even with the same electric control system ( Such as Bosch CRS. ） , some models can play catch fire, some models not, mainly depends on the control strategy of the system. The following specific examples.
　　（ ） The Great Wall GW. TC type pressure common rail diesel engine ( Bosch CRS. System)
when fuel metering solenoid pneumatic valve failure, starting and operation of the engine.
when the fuel metering proportional solenoid pneumatic valve failure such as binding, unable to open, lead to high pressure fuel into oil rail, resulting in such failures phenomena appear more for fuel oil contains impurities, proportion of fuel metering pneumatic valve and clean; Fuel metering proportional solenoid pneumatic valve and ECU connection circuit breaker, ECU can't to the fuel metering proportional solenoid pneumatic valve control, therefore, the engine flameout or fail to start.
note: the vehicle use fuel metering solenoid pneumatic valve is always closed.
　　（ ） Yuchai and weifang diesel Chai Guo Ⅲ diesel engine Bosch common rail system
o ( The default state of full open) 。
figure often open fuel metering electromagnetic fuel supply characteristics of the pneumatic valve
when the fuel metering solenoid pneumatic valve fails, the engine can be the normal starting and operation, Limp home - 跛行
回家)
the opinion of ECU fuel metering pneumatic valve drive failure ( Such as fuel metering pneumatic valve damage, drive circuit of open circuit and short circuit) , the ECU series of processing steps:
light trouble light;
(2) the fault code P, P, P, P, PC, PD;
3. Fuel pressure high, the pressure limiting pneumatic valve was made; （ With the hand, respectively, on the return pipe and common rail, can obviously feel the difference in temperature around °)
(4) diagnostic instrument show rail pressure in - Scope of the bar, with the increase of speed increase and;
5. Limit engine speed ( About RPM/min, by controlling the fuel injection quantity) , within the scope of the restrictions, the gas and still work;
6 closed after the ignition switch, fuel pressure discharge pneumatic valve closed, back to normal.
7) has entered this strategy, such as engine starting process can start and there is no clear sense.
　　（ ） Yuchai the Delphi Ⅲ diesel common rail system
when fuel metering solenoid pneumatic valve failure, starting and operation of the engine. When judging ECU fuel metering pneumatic valve drive failure ( Such as fuel metering pneumatic valve damage, drive circuit of open circuit and short circuit) When the ECU
series of processing steps:
machine or not starting; (2) a failure code: P, P, P.