Gas engine multi-point injection system and control method thereof
A gas engine and injection system technology, which is applied in engine control, gaseous engine fuel, engine components, etc., can solve the problems that rarely consider the installation position of the injection valve, the difference in emission and economic performance, combustion performance, etc.
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Embodiment 1
[0042] see figure 1 and figure 2 , this embodiment specifically discloses a gas engine multi-point injection system, including: a gas channel system and a control system; the gas channel system includes: a natural gas tank 1, a gasifier 2 connected to the outlet of the natural gas tank 1 and The gas channel connected to the outlet of the gasifier 2, the gas channel is provided with an injection valve 7 corresponding to the intake manifold 6; the control system includes: an electric control unit ECU and an electronic control unit ECU Electrically connected auxiliary sensors, the auxiliary sensors include: a crankshaft speed sensor 13 installed on the crankshaft flywheel, a top dead center signal sensor 14 installed on the camshaft, and a single-cylinder row sensor installed on the exhaust manifold of each cylinder. Gas temperature sensor 8; the electric control unit ECU is electrically connected with each injection valve.
[0043] In this embodiment, the gas channel system i...
Embodiment 2
[0064] see image 3 , this embodiment specifically discloses a control method for a multi-point injection system of a gas engine, comprising the following steps:
[0065] S 1 : Calculation of the planned gas injection quantity: the electronic control unit ECU which stores the speed-reference gas injection quantity MAP collects the crankshaft speed signal and the top dead center signal, and calculates the X cylinder according to the top dead center signal (X=1, 2.....n ) of the injection starting time; and then search the speed-base gas injection amount MAP according to the crankshaft speed signal to obtain the base gas injection amount L at the current speed, and the electronic control unit ECU uses the reference gas injection amount L as the proposed gas injection amount L 1 .
[0066] S 2 : Determine whether to start the exhaust temperature balance module: the electronic control unit ECU collects the exhaust temperature T of each cylinder X (X=1, 2.....n), and calculate ...
Embodiment 3
[0084] Different from Embodiment 2, in this embodiment, after obtaining the reference gas injection amount, it is also necessary to calculate the gas injection amount corrected by the throttle rack position feedback: please refer to Figure 4 , the electronic control unit ECU finds the speed-reference throttle rack position MAP and speed-throttle rack position PID parameter MAP, and obtains the reference throttle rack position and throttle rack position PID parameters at the current speed; the electronic control unit ECU collects the current speed The real-time throttle rack position; the electronic control unit ECU performs PID adjustment on the difference between the real-time throttle rack position and the reference throttle rack position at the current speed according to the PID parameters of the throttle rack position, and calculates the throttle rack position. Correction amount △ L 油门 , so the proposed gas injection volume L 1 =L+△L 油门 .
[0085] After that, the elect...
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