| Additionally, the problem of power interruption and torque ripple can often be encountered in the dynamic mode switching of hybrid vehicle. Therefore, this article through the Mainstream Architecture comprehensive analysis of automobile hybrid power system, research and developed a hybrid drive assembly of general HTCU(Hybrid Transmission Control Unit) controller scheme. The HTCU controller in addition to control function with HCU, also has control of electromechanical coupling transmission device, power transmission assembly of thermal management control functions, easy to meet the real-time, synchronization requirements in the transient coordinated control, which can effectively solve the problem of power resulting in hybrid mode switching when the interrupt, torque ripple, shift impact. The function circuit of electric control unit with high reliability, strong antielectromagnetic interference design has been carried out combined with strong electromagnetic interference environment of new energy automobile. Power supply system of great influence on the electronic control unit stable operation, based on the types of interference analysis of power system, the design of the power filter circuit, can make the electronic control unit has sufficient compatibility of the power supply system on the car. Aimed at the speed signal sampling by electromagnetic or Holzer type sensor, and the existing methods difficulties and electromagnetic speed sensor signal processing in the frequency of the amplitude of the signal, is proposed in this paper does not require software to participate in, the universal self adjusting sampling circuit scheme. In the system the faulttolerant control unit, research and design a power control scheme, the sensor input signal processing scheme for fault tolerance, the actuator output signal diagnosis scheme, the main processor fault-tolerant scheme and CAN communication fault tolerant scheme.In the view of electronic control unit thermal design, the thermal model of the electronic control unit has been established, through the factors of thermal characteristics of the electronic control unit and the influence rule of thermal model study. The influence of temperature on the electronic control unit MOSFET power larger pipe, piecewise linear thermal power consumption model is proposed, and the design of the power of MOSFET test to verify the proposed pipe thermal power model accuracy;electronic control unit PCB printed board undertakes about 80% cooling task, and there are many influence factors, the orthogonal experiment has been designed to study different factors and the degree of influence on the primary and secondary lower working temperature of the electronic control unit, combined with the test results recommend the automotive electronic control unit optimal design structure of printed board; by optimizing the component layout to reduce the working temperature of the electronic control unit is a very economical method, but the optimization the classical algorithm for the need topartition of grid computing optimization problem will cause the large amount of computation and storage space, very easy to cause the curse of dimensionality problem of optimization, this paper proposed a dynamic Q based optimization algorithms to optimize thermal optimization designmethod of printed PCB board components layout, the research shows that: in the an ambient temperature of 26℃ condition, the method of component layout optimization can further reduce the maximum operating temperature of printed circuit boards from 50.6℃ to before optimization reduced after optimization based on 41.3℃, reduce the working temperature can be controlled unit or device failure rate reduced from 7.7% to 3.7%, reduced 52%, the working life also from before optimizing the 5.77 Year extended to the optimized 9.56 Year, and prolonging the service life of the 65.7%; and the balance of the entire board of temperature Differential distribution more uniform temperature distribution, the entire board, PCB board, maximum temperature difference decreases from the optimal before 12.5℃ to 5.1℃, further reducing the probability of electronic control unit for thermal stress fatigue failure. In 85 ℃ limit under the environment of high temperature, the maximum temperature decreases from the component placement optimization before 109.6 ℃ to 100.3℃ after optimization, caused by the temperature component failure rate reduced by 44%, and prolonging the service life of 49%. Compared to the original PCB board structure and component layout, at room temperature 26℃, the failure rate is reduced by 86.4%, and prolonging the service life of 2.9 times; in 85℃ limit under the environment of high temperature, the failure rate is reduced by 77.4%, and prolonging the service life of 1.68 times.According to the difficult problem of radiation disturbance for electronic control unit for electromagnetic compatiliby, the test simulation model and simulation model of antiradiation harassment which is consistent with radiation disturbance standard is set up, and comparison and test results verify the electromagnetic radiation simulation model and method can be applied to the electronic control unit according to the standard to test the degree of conformity, can through the radiation disturbance characteristics research of electricmodel unit and antiradiation disturbance characteristics, which can reduce the test cost, shorten the development cycle.Finally, through the bench test, environmental adaptability test and electromagnetic compatibility test proves that the optimization design results of this article, the relative function target has reached A level, radiation is also in line with the most severe Level 5 grade. The designed electronic control unit can be guaranteed with enough vehicle environment adaptability when loading in vehicle use. |
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