New energy automobile speed regulation control system

Abstract

A new energy automobile speed regulation control system relates to the technical field of motor speed regulation and comprises a motor driving circuit, a detection circuit and a control circuit. The motor driving circuit comprises a rectifying circuit for rectifying an alternating-current power supply into a direct-current power supply and an inverter circuit for converting the direct-current power supply into the alternating-current power supply, the input end of the rectifying circuit is connected with a three-phase alternating-current power supply, the output end of the rectifying circuit is connected with the input end of the inverter circuit, and the output end of the inverter circuit is connected with the input end of a three-phase alternating-current motor; the input end of the detection circuit is connected with the output end of the three-phase alternating current motor, and the output end of the detection circuit is connected with the input end of the control circuit; the output end of the control circuit is connected with the input end of the inverter circuit, and the control circuit controls the rotating speed and load of the three-phase alternating current motor by adjusting the output voltage and frequency of the inverter circuit. The system is simple in technology and low in investment, does not affect other electronic equipment in the operation process, and can provide a quiet and comfortable riding environment for passengers.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor speed regulation technical field, especially a new energy automobile speed regulation control system. BACKGROUND

[0002] New energy vehicles, including pure electric vehicles, hybrid electric vehicles, fuel cell vehicles and the like, have fundamentally changed their power systems compared to traditional fuel vehicles. As the main power source of new energy vehicles, the speed regulation performance of the motor directly affects the overall performance of the vehicle. Speed regulation technology not only determines the acceleration ability and maximum speed of the vehicle, but also affects the energy consumption level and the range. Therefore, research and optimization of the speed regulation technology of new energy vehicles are of great significance to the development of the new energy vehicle industry. According to different motor types and application scenarios, there are various motor speed regulation methods to choose from, such as variable frequency speed regulation, voltage regulation speed regulation, variable pole number speed regulation, etc. Among them, variable frequency speed regulation is the most widely used method, which can adjust the speed and torque output of the motor by changing the power supply frequency of the motor.

[0003] However, the variable frequency speed regulation method has the following disadvantages: currently, the initial investment of the frequency converter is relatively high, which is a major factor limiting its widespread application in new energy vehicles; variable frequency speed regulation technology involves knowledge in multiple fields such as power electronics technology and control theory, and the technology is relatively complex; the variable frequency speed regulation system may generate electromagnetic interference (EMI) during operation, affecting other electronic devices inside the vehicle. SUMMARY

[0004] The technical problem to be solved by the utility model is to provide a new energy automobile speed regulation control system to solve the problems of high investment, complex technology, and electromagnetic interference generated during operation affecting other electronic devices inside the vehicle in the prior art.

[0005] The technical solution to solve the above technical problems is: a new energy automobile speed regulation control system, comprising a motor drive circuit, a detection circuit, and a control circuit; the motor drive circuit comprises a rectifier circuit for rectifying an alternating current power supply into a direct current power supply, an inverter circuit for converting the direct current power supply into an alternating current power supply, the input end of the rectifier circuit is connected to a three-phase alternating current power supply, the output end of the rectifier circuit is connected to the input end of the inverter circuit, and the output end of the inverter circuit is connected to the input end of a three-phase alternating current motor; the input end of the detection circuit is connected to the output end of the three-phase alternating current motor, and the output end of the detection circuit is connected to the input end of the control circuit; the output end of the control circuit is connected to the input end of the inverter circuit, and the control circuit adjusts the output voltage and frequency of the inverter circuit to control the speed and load of the three-phase alternating current motor.

[0006] The further technical scheme of the utility model discloses: control circuit includes speed regulator, PI regulator, PWM controller that are connected in series in proper order, and the input of speed regulator is connected with the output of detection circuit, and the signal output of PWM controller is connected with the input of inverter circuit.

[0007] The further technical scheme of the utility model discloses: detection circuit includes speedometer.

[0008] The further technical scheme of the utility model discloses: rectifier circuit adopts three-phase bridge type uncontrolled rectifier circuit.

[0009] The further technical scheme of the utility model discloses: inverter circuit includes inverter, and the inverter adopts three-phase half bridge type topology structure of IGBT as switching element.

[0010] Compared with the prior art, the new energy automobile speed regulation control system has the following beneficial effects:

[0011] 1. Can solve the problem of high investment, complex technology, influence on other electronic equipment in the operation process

[0012] The utility model discloses a motor drive circuit, detection circuit, control circuit, wherein motor drive circuit includes rectifier circuit, inverter circuit, the utility model discloses a rectifier circuit can provide DC power input for inverter circuit, through inverter circuit then converts DC power supply into AC power supply and adjusts its voltage and frequency, through detection circuit provides feedback signal for control circuit, and control circuit then according to feedback signal calculates and exports control signal to inverter circuit. This feedback circuit structure makes the system can adjust according to the actual operation state of three-phase AC motor, realizes accurate constant voltage frequency ratio control, and the investment is relatively lower, and constant voltage frequency ratio speed regulation technique is relatively simple, and also will not produce electromagnetic interference in the operation process, avoids the influence on other electronic equipment in the vehicle interior.

[0013] 2. Motor acceleration and deceleration are smooth

[0014] The utility model discloses a motor drive circuit, detection circuit, control circuit, wherein motor drive circuit includes rectifier circuit, inverter circuit, and rectifier circuit provides DC input for inverter circuit, and inverter circuit then converts DC into AC and adjusts its voltage and frequency, and detection circuit provides feedback signal for control circuit, and control circuit calculates and exports control signal to inverter circuit according to feedback signal. This feedback mechanism makes the system can adjust according to the actual operation state of motor, realizes accurate constant voltage frequency ratio control. Therefore, the actual frequency of the system rises or falls with the synchronous speed in the speed regulation process, and acceleration and deceleration are smooth.

[0015] 3. Ensures stable operation of the motor

[0016] The utility model discloses the voltage, frequency and rotating speed of motor are accurately controlled by frequency conversion circuit, and the motor can be ensured stable operation under various load conditions.

[0017] 4. Can keep the continuity and stability of vehicle power

[0018] The utility model discloses can respond to load change quickly, and the continuity and stability of vehicle power are kept through the working state of dynamic adjustment motor.

[0019] 5. Can reduce energy consumption

[0020] The utility model discloses the voltage and frequency of motor are dynamically adjusted according to load condition, and the motor is operated at the best efficiency point, thereby greatly reducing energy consumption.

[0021] 6. Can prolong the service life of equipment

[0022] The utility model discloses the starting current of motor can be reduced, and the impact and damage to equipment are alleviated, and the service life of equipment is prolonged.

[0023] 7. Can provide more quiet and comfortable riding environment for passengers

[0024] The constant voltage frequency ratio speed regulation of the utility model can be conveniently adjusted through the control panel of frequency converter, and the demand under different working conditions is satisfied. Moreover, the constant voltage frequency ratio speed regulation can reduce the noise of motor, and provide more quiet and comfortable riding environment for passengers.

[0025] Below, the technical features of one kind of new energy automobile speed control system of the utility model are further explained in combination with the drawings and examples. DRAWINGS

[0026] Figure 1 The structure block diagram of one kind of new energy automobile speed control system of the utility model,

[0027] Figure 2 The circuit principle drawing of motor drive circuit of example one,

[0028] Figure 3 The structure block diagram of motor drive circuit of example one,

[0029] Figure 4 The circuit principle drawing of rectifier circuit of example one,

[0030] Figure 5 The circuit principle drawing of inverter circuit of example one. DETAILED DESCRIPTION

[0031] Embodiment one

[0032] A new energy vehicle speed control system, the structural block diagram is seen from Figure 1 , including motor drive circuit, detection circuit, control circuit;The motor drive circuit includes the rectifier circuit that converts alternating current power into direct current power, the inverter circuit that converts direct current power into alternating current power, the input end of rectifier circuit is connected three-phase alternating current power, the output end of rectifier circuit is connected with the input end of inverter circuit, the output end of inverter circuit is connected with the input end of three-phase alternating current motor;The input end of detection circuit is connected with the output end of three-phase alternating current motor, and the output end of detection circuit is connected with the input end of control circuit;The output end of control circuit is connected with the input end of inverter circuit, and the control circuit controls the speed and load of three-phase alternating current motor by adjusting the output voltage and frequency of inverter circuit.

[0033] The rectifier circuit provides direct current power input for the inverter circuit, and the rectifier circuit adopts three-phase bridge type uncontrollable rectifier circuit.

[0034] The inverter circuit converts direct current power into alternating current power and adjusts its voltage and frequency, and the inverter circuit includes an inverter, and the inverter adopts three-phase half-bridge topology structure with IGBT (IGBT is the abbreviation of "Insulated Gate Bipolar Transistor", namely: insulated gate bipolar transistor) as switching element.

[0035] The detection circuit provides feedback signal for control circuit, and the detection circuit includes speed detector.

[0036] The control circuit calculates and outputs control signal output to inverter circuit according to the signal fed back by detection circuit;The output of inverter circuit is accurately controlled by control circuit to realize the goal of constant voltage frequency ratio control. The control circuit includes speed regulator, PI regulator and PWM controller connected in series, the input end of speed regulator is connected with the output end of detection circuit, and the signal output end of PWM controller is connected with the input end of the inverter circuit.

[0037] Figure 2 It is the circuit principle drawing of motor drive circuit, the left dashed box is rectifier circuit, and the rectifier circuit converts alternating current power into direct current power;The right dashed box is inverter circuit, and the inverter circuit converts direct current power into alternating current power with variable frequency, so that the voltage and frequency can be adjusted.

[0038] Figure 3This is a block diagram of the motor drive circuit. The effective value of the three-phase AC power supply is 380V and the frequency is 50Hz. It adopts the AC-DC-AC power conversion mode and uses a three-phase bridge uncontrolled rectifier circuit. Then, the six-pulse DC obtained by rectification is filtered, and finally the obtained DC voltage is inverted. In the inversion process, voltage and frequency conversion are realized.

[0039] Figure 4 This is a circuit diagram of a rectifier circuit. When the three-phase AC power from the power supply enters the uncontrolled rectifier circuit, the presence of capacitors can remove the filtering in the AC power, turning the AC power into DC power and thus reducing the loss of electrical energy.

[0040] Figure 5 This is the circuit diagram of an inverter circuit. This inverter circuit uses a three-phase voltage-source inverter circuit. The characteristics of a voltage-source inverter circuit are: the DC side is directly connected to a voltage source and has a large capacitor in parallel, thus being equivalent to a voltage source. The AC side output voltage waveform is a rectangular wave, and the AC side output waveform is independent of the magnitude and type of load impedance. The reactive power of the load impedance is generally supplied by the AC side, and the DC side capacitor acts as a buffer for reactive power.

Claims

1. A speed control system for new energy vehicles, characterized in that: The system includes a motor drive circuit, a detection circuit, and a control circuit. The motor drive circuit includes a rectifier circuit that converts AC power to DC power and an inverter circuit that converts DC power to AC power. The input terminal of the rectifier circuit is connected to a three-phase AC power source, and the output terminal of the rectifier circuit is connected to the input terminal of the inverter circuit. The output terminal of the inverter circuit is connected to the input terminal of the three-phase AC motor. The input terminal of the detection circuit is connected to the output terminal of the three-phase AC motor, and the output terminal of the detection circuit is connected to the input terminal of the control circuit. The output terminal of the control circuit is connected to the input terminal of the inverter circuit. The control circuit adjusts the output voltage and frequency of the inverter circuit to control the speed and load of the three-phase AC motor.

2. The speed control system for a new energy vehicle according to claim 1, characterized in that: The control circuit includes a speed regulator, a PI regulator, and a PWM controller connected in series. The input terminal of the speed regulator is connected to the output terminal of the detection circuit, and the signal output terminal of the PWM controller is connected to the input terminal of the inverter circuit.

3. The speed control system for a new energy vehicle according to claim 1, characterized in that: The detection circuit includes a speedometer.

4. A speed control system for new energy vehicles according to claim 1, characterized in that: The rectifier circuit described herein adopts a three-phase bridge uncontrolled rectifier circuit.

5. A speed control system for new energy vehicles according to claim 1, characterized in that: The inverter circuit includes an inverter that uses a three-phase half-bridge topology with IGBTs as switching elements.

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