Control system signal data acquisition In the engine data acquisition process, the use of Volkswagen vehicle-specific diagnostic tester for data acquisition. Limited by the test conditions, taking into account the vehicle operating conditions are not unique, while the operating conditions change the actuator will produce different results and other factors, so in the data acquisition process, the car engine free acceleration and deceleration The test of condition data starts when the water temperature reaches normal, that is, 80, the computer will automatically record, record once every 1.3s, control the throttle cable, and slowly increase the engine speed from idle to 3500r/min, repeatedly Test to get more accurate engine signal data. And on this basis, data analysis and collation. The collected data is processed and the mutation signal is discarded, and the sensor signal database under different test conditions is established.

The data flow analysis and processing engine idling speed range is 800920r/min. At this time, each sensor signal is relatively stable; as the rotation speed increases, each sensor signal begins to change. From the measured data, it can be seen that the higher the rotational speed, the greater the angle of rotation of the crankshaft in the same period of time. If the combustion rate of the mixture gas is constant, the optimal ignition advance angle should increase linearly. However, when the rotation speed is increased, the combustion speed is accelerated due to the increase in the pressure and temperature of the air-fuel mixture and the increase in the spoiler. Therefore, the optimum ignition advance angle should be increased as the engine speed increases, but it is not linear.

When the engine is started, because of large fluctuations in the rotational speed, neither the air flow nor the intake manifold pressure sensor can accurately measure the amount of intake air. Therefore, when starting, the ECU generally does not calculate the fuel injection time based on the inhaled air quality, but according to the actual temperature of the engine cooling water, the basic injection pulse width is detected from the water temperature injection time stored in the ROM, and then the intake air The temperature signal and the battery voltage signal are corrected to obtain the injection pulse width at the start.

Based on the measured data, the relationship among the ignition advance angle, air mass flow rate, fuel injection time, throttle opening, and oxygen sensor voltage, respectively, can be made, for example, as shown. Car sensor signal simulation, design (1) signal simulation of air mass flow and engine speed curve based on the test results, analysis of different vehicle sensor signal characteristics, the car sensor signal classification simulation.

In the processing process, the temperature sensor, position sensor and other signals are linearly changed within the normal working range to simulate the change rule. The actual simulation of the air flow signal in the linear simulation process is as consistent as possible with the actual change in the free acceleration and deceleration conditions of the engine. Simulation of vehicle crankshaft speed signal and angle signal, taking into account the actual analysis of the actual detection process results, only established engine operating speed from 600r/min to 3500r/min change.

(2) Signal design Through the analysis of sensor signals for vehicles, and according to the working range of signal changes, the input power of the linear signal selects 5V and 12V power according to the actual conditions, and the potentiometer is used for continuous adjustment to realize the input of signals of different working conditions. .

Conclusion The diagnostic instrument uses a standard onboard diagnostic system connector that can be connected to a diagnostic instrument for fault diagnosis, data flow analysis, and actuator testing. Diagnostic instrument can be used to realize the diagnosis of the sensor. At the same time, the diagnostic instrument has good on-vehicle diagnosis function and can perform signal communication and matching with the vehicle.

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