Integrated fuel supply module
(one) Fuel from the fuel tank (1)First, it flows through a coarse filter (150 microns) equipped with an oil-water separator. Then the fuel flows into the IFSM, which is the Integrated Fuel System Module (Integrated Fuel System Module).
(two) The incoming oil flows through the electronic fuel supply pump (2) .
(three) After passing the electronic fuel pump, there is an electronic fuel pump bypass valve (21) with a pressure of 0.07 kg,The function of the bypass valve is to expel the air in the oil circuit as soon as possible, so as to improve the engine starting performance.
(four) When the engine is started,A gear-type fuel pump (4) will be able to autonomously suck fuel from the fuel tank into the pump through an anti-reverse suction check valve (20). The fuel supply of the electronic fuel supply pump is no longer needed, and the electronic fuel supply pump stops working two minutes after the engine is started.
Each group has three injectors, and each group of injectors will be controlled by a metering fuel control valve (12) and a timing fuel control valve (13).
Since the firing sequence of each cylinder is 1/5/3/6/2/4, with the cam position of each cylinder, it can be ensured that only one injector is in a position that can receive metered fuel and timing fuel entry.
When the fuel injector metering process and timing process are completed, the cam drives the upper plunger of the fuel injector to go down, and a hydraulic link is formed inside the fuel injector, and the internal pressure rises to start fuel injection. The fuel injection will end after the lower plunger of the fuel injector reaches the sealing seat surface of the fuel nozzle.
Due to the special design of the nozzle, the end of the injection process of the HPI-TP injector will be very fast.
The fuel above the injector timing plunger will flow out of the injector and flow into the cylinder head after the injector completes the injection, and then flows back into the oil return passage of the integrated fuel control module, and finally returns to the fuel tank.
The specific structure and working principle of the fuel injector will be described in detail in a later article.
These fuels in a closed state will absorb the heat of the engine. When the fuel temperature rises, its volume will also expand and cause the pressure in the metered fuel passage to rise.
This will cause the start resistance of the starter motor to rise and cause difficulty in starting the engine hot.
In order to solve this problem, a very small orifice (0.008 inch) is designed on the metering fuel oil passage and a check valve is designed on the metering flow control valve to release the pressure rise caused by high temperature.