Hardware system composition of the hottest electro

2022-07-24
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Hardware system composition of electronic control automatic clutch control system

the control system takes ATmegal6 single chip microcomputer as the core, in which the key part is used to reset and manually control the operation of the motor; K line communication unit is used for communication between engine EC port and atme scaffold fastener safety net testing machine feature gal6; The power supply circuit provides 5V power supply for single chip microcomputer, 12V power supply for DC motor and power supply for sensor; The DC motor drive module controls the start and stop, running speed and forward and reverse rotation of the motor through the PWM signal provided by the single chip microcomputer; The analog-to-digital conversion interface of ATmegal6 is mainly used for the input of sensor signals and required analog signals; The switching variable simulation part is used to simulate signals such as brake switch signals; The display alarm unit is mainly used to display travel, fault and other information, and to alarm in case of misoperation

1 motor drive circuit

the DC motor is used to drive the clutch control mechanism. Therefore, in order to realize the rapid separation and stable automatic combination of the clutch, the motor is required to have the advantages of rapid response and convenient speed regulation. In this scheme, 150W DC motor and two half bridge intelligent power drive chips bts79608 are used to form an H-bridge drive circuit. As shown in Figure 3

bts7960 is a high current half bridge high integrated chip applied to motor drive. It has an n-channel low side MOSFET, a p-channel high side MOSFET and a drive IC. The INH pin is at a high level, enabling the bts7960. The in pin is used to determine whether the MOSFET is on. That is, when in=1 and inh=1, the high side MOSFET, O port t pin outputs high level; When in=0 and inh=1, the low side MOSFET is turned on, and the O port t pin outputs a low level. Therefore, through the up. The buqiao arm switch tube controls the switching action of bts79608 with PWM signal to realize the control status of anti Yang PWM driving and braking of the motor

2 signal input module

in order to make the clutch engagement speed adapt to the driver's intention and the changes of various road conditions, the clutch engagement speed control is very important. The basic way to control the smooth engagement of clutch is to effectively control the engagement degree and engagement speed of clutch. The purpose of ACS is to realize this automatic control. In the control process, the signals required include: engine speed, vehicle speed, braking signal, throttle opening signal, gear signal, etc. In the trial production of this control system and the configuration of oil regulating pump and electromechanical unit, the serial double elastic support mode is adopted. During the trial process, each signal is obtained from different channels

2.1 K-line communication

the circuit of the K-line communication module with mc33290 as the core is shown in Figure 4. Mc33290 is a dual m, half duplex communication interface chip specially developed for vehicle fault diagnosis. It can realize the level conversion between single chip microcomputer serial port and K-line. The K-line communication can obtain the engine speed, vehicle speed and throttle switch from the engine EC port

2.2 ad analog-to-digital conversion

(1) sensor signal: it mainly obtains the signals of the travel sensor and gear sensor of the control mechanism

(2) analog signal: during software debugging, all kinds of signals need to be simulated when there is no vehicle for live experiment. The continuously changing signals such as engine speed and throttle opening are obtained through the adjustment of a positioner

2.3 switch signal simulation

shift intention, ignition signal, braking and other switch signals can be simulated by dialing the switch that workers walk around in the factory. Input from ATmegal6 port, low level represents' off 'and high level represents' on'. Through the simulation of these signals, the operation of the software can be debugged on the premise of leaving the vehicle

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