gl8点火控制系统

gl8点火控制系统 Shanghai Buick car ignition control system consists of ignition control module (ICM), ignition coil, 7X crankshaft position sensor, crankshaft position sensor, 24X power system control module PCM and all connected. Ignition control module ICM The ignition control module has the following functions: through the pulse signal 7X crankshaft position sensor to determine the correct ignition order (the firing order is in the starting of the engine), when the engine is running, the ignition control module according to the appropriate ignition order continuously trigger ignition coil; to send 3X PCM reference signal of crankshaft position sensor in order to use the PCM signal to determine the engine speed and the calculation of ignition advance angle. The functions of the related circuits are as follows: 1. 3X reference signal high state (circuit 430). 7X crankshaft position sensor sends the signal to ICM, and ICM generates 3X reference signal and sends to PCM, PCM uses this signal to calculate crankshaft position and engine speed (also used to trigger injector). 2.3X reference signal low state (circuit 453). The circuit is grounded through ICM and ensures no voltage drop between the ICM and the PCM ground circuit. 3. bypass control circuit (circuit 424). At initial start, ICM controls ignition. PCM synchronous pulse signal for camshaft position sensor, crankshaft position sensor and 7X (the signal indicating 1 cylinder piston and the intake valve position), at the same time PCM received the signal, provide the voltage 5V to bypass the control circuit (which usually occurs in the crankshaft before 1 -2, ICM). The ignition control (to ensure the performance of ICM has a fixed ignition advance angle). 4. ignition control (IC) circuit (circuit 423). After the engine starts, the PCM controls the ignition. PCM calculates the required ignition advance angle according to the reference signal of the crankshaft position sensor, and uses this circuit to trigger the ICM. 5. when PCM in IC circuit (circuit 423) detected in the circuit fault, PCM will set the fault code P1351 (which means the ignition control circuit of high voltage state); when the PCM in the IC circuit (424 circuit) detected and ground fault occurs, PCM will set the fault code P1361 (meaning the ignition control circuit of low voltage state); when the PCM in the bypass control circuit (424 circuit) detected in circuit fault, PCM fault code will set the P1352 (which means the ignition control circuit of high voltage bypass state); when the PCM in the bypass control circuit (424 circuit) detected with power supply short circuit fault, PCM will set the fault code P1362 (which means the ignition control circuit of low voltage bypass state). The recorded fault code in the PCM at the same time, the fault light lights on the dashboard, the traction control equipment of the Shanghai Buick car, PCM will be through the serial data line command EBTCM closed traction control function, at the same time, the EBTCM lights on the dashboard TRACTION OFF indicator. Two, ignition coil, high voltage line using 3 sets of ignition coil, each coil control two cylinders (1/4, 2/5, 3/6). The three ignition coils are respectively mounted on the ignition control module, each coil component is supplied by two simultaneous spark plugs (waste spark distribution), each coil has an insurance ignition circuit power supply. There is another pin connected to the ignition control module in the ignition coil, in which the ignition coil is sequentially excited by connecting and interrupting the ground circuit of the primary circuit at the proper time. The secondary resistance of the ignition coil is 5000-7000 ohms, and the resistance of the high voltage ignition line is about 7000 ohms, which should be replaced in the out of range. Three, 7X crankshaft position sensor double wire magnetoelectric sensor, located in the lower part of the engine block, exhaust manifold lower part. In the starting process, the ignition control module (ICM) receives the 7X crankshaft position sensor signal to determine the ignition timing. Once ICM determines spark synchronization, the PCM will instruct all 6 injectors to open and spray a small amount of fuel into all cylinders. When the engine runs, the ignition control module continuously triggers the ignition coil according to the proper ignition sequence, At the same time, the 3X crankshaft position sensor reference signal is generated and sent to the PCM so that PCM can use this signal to determine the engine speed and calculate the ignition advance angle. The 7X sensor should have an AC voltage signal of about 2.0V when starting the engine. Four, 24X crankshaft position sensor 3 wire Holzer sensor, located on the right side of the engine, crankshaft end. The 24X reference signal is sent directly to the PCM to improve idle ignition control of the engine. At the engine speed of 1200 rpm, PCM uses 24X reference signal to calculate engine speed and crankshaft position. PCM continuously monitors the number of pulses on the 24X reference circuit, and compares the 24X reference pulse number with the received 3X reference pulse number and the camshaft signal pulse number. If PCM receives the 24X reference circuit pulse number is incorrect, will set DTC P0336, and PCM will use the 3X reference signal circuit to control fuel and ignition. The engine will continue to start and operate only with the 3X reference signal and the cam position signal. Five, 3X reference signal 3X reference signal generated by the ignition control module ICM. When the engine runs and receives the 24X synchronous pulse, the ICM module divides the 7X pulse of the crankshaft position CKP sensor by 2, and calculates the reference signal of the 3X. When the engine speed is more than 1600 + 150 rpm, PCM uses 3X reference signal to calculate the engine speed and crankshaft position. PCM also uses these signals to trigger injector pulses. PCM compares the 3X reference pulse with the 24X CKP pulse and the CMP pulse. If the number of 3X circuits received by PCM is incorrect, DTC P1374 is set and PCM 24X CKP reference circuit is used for fuel and ignition control. The engine will continue to start and operate only with the 24X CKP reference and the camshaft position sensor signal. Six, the bypass control mode ignition control module (ICM) sends fuel control to PCM and calculates the signal needed for ignition advance. When the engine starts, the ICM controls the ignition advance (bypass mode) according to the 7X signal. When the PCM identifies second 3X reference pulses, 5 volts are applied on the bypass, and the command ICM converts the ignition advance to PCM control (IC mode). If PCM detects a disconnection in the bypass, DTC P1352 will be set. The engine continues running and runs in bypass mode. If PCM detects bypass and short circuit voltage, DTC P1362 will be set up. The engine continues running and runs in bypass mode. Seven, IC control mode ignition control module (ICM) sends fuel control to PCM and calculates the signal needed for ignition advance. When the engine starts, the ICM controls the ignition advance (bypass mode) according to the 7X signal. When the PCM identifies second 3X reference pulses, 5 volts are applied on the bypass, and the command ICM converts the ignition advance to PCM control (IC mode). If PCM detects a break in the IC circuit, the DTC P1351 will be set. The engine starts and runs in bypass mode. If the IC circuit is short circuited or the bypass circuit is bad, the PCM can not monitor the IC pulse, the DTC P1361 will be set up, the engine will start and run in the bypass mode. Eight, the camshaft position sensor CMP 3 wire Holzer sensor, located on the right side of the engine, in the starting process, ignition control module (ICM) monitoring 7X crankshaft position sensor signal. Once ICM determines spark synchronization, the PCM will instruct all 6 injectors to open and spray fuel into all cylinders. PCM receives a cam pulse signal and triggers sequential fuel injection. PCM continues to monitor the pulse number of the cam signal, and compares the cam pulse number with the received 24X reference pulse number and the 3X reference pulse number. If the PCM receives the cam reference circuit pulse number is incorrect, will set DTC P0341, and PCM use the fuel injector correct one of the 6 opportunities to trigger fuel injector sequence, rather than using the cam signal. If misfire occurs, even if misfire occurs, the diagnosis will be affected, but the engine will continue to start and run normally. Nine, knock sensor and its overhaul Shanghai Buick PCM contain integral knock sensor (KS) diagnostic circuit. The input signal (AC) of the knock sensor is used to detect engine knock, which makes the PCM delay the ignition timing of the ignition control (IC) according to the size and frequency of the KS signal. If PCM detects the failure of the diagnostic circuit of the knock sensor, the fault code of DTC P0325 (bad knock sensor system) will be set up. The knock sensor produces AC signals in all the operating conditions of the engine. PCM will calculate the average voltage of the detonation sensor signal, and when the system is normal, the KS signal changes on average voltage. If PCM detects that the KS signal is equal to the average voltage more than 10 seconds, the fault code of DTC P0327 (bad detonation sensor circuit) will be set. Citation: [