1、华南农业大学期末考试试卷（A 卷）2010 学年第 2 学期 考试科目： 汽车电子学 考试类型：（开卷）考试 考试时间： 120 分钟学号 姓名 年级专业 题号 一 二 三 四 五 总分得分评阅人1 Fill in the blanks（20%）1) The charging voltage of an engine running at approximately 3000 rev/min should be _volts. The difference between a battery-sensed and a machine-sensed alternator is _.2) P-ch
2、annel MOSFETs are normally used as high-side switches because _ , and when _ they will turn on thus closing the switch. For a N-channel MOSFET the TURN-ON condition is _. A logic level MOSFET means _.3) For DC motor control, one quadrant operation means _ and two quadrant operation means_. 4) One ap
3、plication of a charge pump circuit is to _, where it operates by the principle of _. 5) The lambda sensor produces a voltage that _ the airfuel ratio. If the voltage received by the ECU is below the voltage value at stoichiometry _ is increased. If_, it means that the airfuel mixture is rich.6) Ther
4、e are three conditions contained in the international regulations concerning the use of xenon light: _; _; and _.7) With PKE (Passive keyless entry) the communication is two-way. The vehicle sends a random challenge to the key; the key _ and sends it back to the vehicle. The vehicle _, compares the
5、result with that sent by the key, and unlocks the doors if _.8) The typical electronic flasher unit of a direction indicator has three main sections: the relay driver, an oscillator and _.2 Definitions or Meanings(20%)1) brushless DC motor 2) H bridge using MOSFETs 3) buck converter 4) steer-by-wire
6、 3 Brief Questions(20%) 1) Why N-channel MOSFETs are sometimes used as high-side switches?2) Explain how and why the output voltage of an alternator is regulated. 4 Questions and Analyses (40%)1) DC motor speed control circuit(see figure) analysis and design. Analyze the operation theory of the circ
7、uit; Design a PWM generating circuit to replace the signal generator labeled VG1. You are required to explain the theory of your circuit.V1 12R1 510D1 1N4448 T1 IRF540C1 1uR3 1kR4 680 T2 2N2222AT3 2N2907AT4 2N2222AVF1 VF2 VF3 +VG1+-DCM1 12PWM.2) Fig.2 illustrates the three architectures of HEV (Hybrid electric vehicle), analyze the operation modes, advantages and disadvantages of the three architectures.Fig.2 Architectures of HEV
