Pulse width modulation window wiper control system of locomotive
A pulse width modulation and control system technology, applied in vehicle maintenance, vehicle cleaning, transportation and packaging, etc., can solve the problems of high cost of electric wipers, easy damage to control circuits, short service life, etc., to suppress switching noise. , the effect of reducing heat generation and temperature rise, and prolonging the life of the circuit
Active Publication Date: 2014-03-12
HUNAN UNIV OF TECH
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Problems solved by technology
[0004] The purpose of the present invention is to overcome the disadvantages of high cost, short service life, easily damaged control circuit and high failure rate of current electric wipers, and provide a locomotive wiper with simple structure, low cost, stable performance and high reliability Control System
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[0030] The present invention is further described as follows in conjunction with accompanying drawing and example:
[0031] Such as Figure 1-6 As shown, a pulse width modulated locomotive wiper control system, the central control unit (6) scans the slow, fast, intermittent or stop signals input by the control circuit (5), and operates the high-frequency and high-speed isolation circuit through PWM (12), high-speed MOS tube drive circuit (13), running MOSFET (14), outputting pulse width modulation signal, controlling the single-speed wiper motor (10) to drive the scraping arm mechanism (11) to perform slow and fast speed on the railway locomotive glass , Intermittent scraping operation or stop.
[0032] Such as figure 2 As shown, the DC power supply delay power-off switch circuit of the pulse width modulated locomotive wiper control system connects the 0 point to GND through the knob switch, and through the discharge of the capacitor C2, the delay of the triode Q1 is turned...
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The invention discloses a pulse width modulation window wiper control system of a locomotive, which comprises a direct-current power delay power-off switching circuit, a window wiper direct-current motor PWM (pulse width modulation) control driving circuit, a motor overcurrent protecting circuit, a window wiper direct-current stop braking circuit and a single-speed direct-current motor. A central control unit is connected with a running MOSFET (metal oxide semiconductor field effect transistor) by a PWM running high-frequency high-speed isolating circuit and a high-speed MOS (metal oxide semiconductor) driving circuit to control the single-speed window wiper motor to wipe and run at slow speed or high speed or intermittently. A brake output port of the central control unit is connected with a brake MOSFET by a brake isolating circuit and a brake bipolar MOS driving circuit to control the single-speed window wiper motor to dynamically brake and stop. The single-speed motor overcomes the shortcoming of quick abrasion of a slip ring carbon brush due to asymmetric torque of a double-speed motor, the PWM control driving circuit reduces a heating value and temperature rise of a direct-current motor driving circuit, service lives of the motor and the system are prolonged, and cost is lowered.
Description
technical field [0001] The invention relates to the electronic technical field of locomotive wiper control, and is especially suitable for the wiper control of locomotives, urban rails, subways and other rail transits. Background technique [0002] There are two types of windshield wipers and electric wipers. Electric wipers for locomotives have particularities: the DC 110V power supply of locomotives (power supply for electric wipers) fluctuates severely (±30%), the grid impulse voltage is high, the operating torque load is large, and locomotives frequently cross and enter tunnels Special circumstances such as a sudden increase in the torque load of the wiper. [0003] There are currently two control schemes for electric wipers. 1. Relay control two-speed permanent magnet DC motor scheme: the disadvantages are that the relay contacts are arc-burned, serious electromagnetic interference, high noise, short service life of the motor, etc., and the failure rate is high. 2. T...
Claims
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IPC IPC(8): B60S1/08
Inventor 龙永红黄晓峰周葵申刘小卫易吉良龙晓薇贺理高望力黄昌剑
Owner HUNAN UNIV OF TECH