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A control method and system for switching between open and closed loop control of electronic water pump

An electronic water pump, open and closed-loop technology, applied in the control of motor vibration, single motor speed/torque control, observer control, etc. Protect from overcurrent damage, prevent unlimited increase, the effect of soft speed increase

Active Publication Date: 2022-02-18
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This speed control strategy currently has the following shortcomings: first, when the open-loop control is switched to closed-loop control, the speed switching cannot be effectively performed, and there is speed jitter; second, there is overshoot in the linear PID control, and the control accuracy is not high; The torque ripple of the brush motor will cause the fluctuation of the speed
These deficiencies affect the control performance of the electronic cooling water pump, resulting in pump vibration, unstable speed, and loud noise

Method used

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  • A control method and system for switching between open and closed loop control of electronic water pump
  • A control method and system for switching between open and closed loop control of electronic water pump
  • A control method and system for switching between open and closed loop control of electronic water pump

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Embodiment 1

[0046]In order to solve the problem that traditional electronic water pumps vibrate significantly when switching between open and closed loop control, the present invention proposes a control method and system for switching between open and closed loop control of electronic water pumps. The method first uses the inductance method to determine the initial Phase, and then open-loop control, so that the water pump accelerates to rotate, can detect the motor stator inductance back EMF zero crossing point, and when the speed can be calculated, start switching to closed-loop control. Closed-loop control is an improved speed first-order active disturbance rejection control method, and its specific steps are as follows: figure 1 shown, including:

[0047] S0: Obtain the initial phase of the brushless motor rotor, and input the duty cycle and commutation frequency adjusted PWM signal to the brushless motor to increase the rotor speed according to the initial phase;

[0048] S1: When t...

Embodiment 2

[0070] In order to better understand the inventive idea of ​​the present invention, this embodiment illustrates the present invention in the form of a system structure, such as figure 2 As shown, a control system for electronic water pump open-closed-loop control switching, drives the water pump through a brushless motor, when the brushless motor switches from open-loop mode to closed-loop mode, it includes:

[0071] The mode switching module is used to obtain the real-time speed signal of the rotor according to the inductance back EMF after detecting the inductance back EMF of the stator of the brushless motor, and when the real-time speed corresponding to the real-time speed signal exceeds the preset speed, the control system enters the closed-loop mode;

[0072] A filter module, configured to filter the target speed signal to obtain an actual speed expectation map;

[0073] The calculation module is used to use the data points corresponding to the real-time speed in the ac...

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Abstract

The invention discloses a control method and system for switching between open-closed-loop control of an electronic water pump, relates to the field of electronic control, and specifically includes the steps of: switching to a closed-loop mode when the real-time rotational speed exceeds a preset rotational speed; Rotational speed expectation diagram, and the data point corresponding to the real-time rotational speed in the actual rotational speed expectation diagram is taken as the current rotational speed expectation value, and the actual rotational speed expectation value and the total disturbance of the next calculation cycle are obtained by using the second-order extended state observer according to the current rotational speed expectation value; and according to the actual rotational speed The expected value and the total disturbance use the proportional control formula to obtain the undisturbed current output, and compensate the total disturbance; control the brushless motor to drive the water pump according to the undisturbed current output. Through the above steps, the control error of the present invention is far smaller than that of the traditional PID, which not only ensures that the speed increases, the brushless motor accelerates to a steady speed, but also ensures that the speed increases softer and the motor accelerates without shaking.

Description

technical field [0001] The invention relates to the field of electronic control, in particular to a method and system for switching between open and closed loop control of an electronic water pump. Background technique [0002] The automobile engine cooling water pump is an important component for cooling the automobile engine. The automobile engine needs to be cooled when it is working or just after the work. Among them, when the engine is working, it is necessary to ensure that the temperature of the cooling water tank inside the engine is between 85 and 95°C; and when the work is just finished, it is also necessary to continuously cool down the engine to reduce the temperature of the engine to room temperature. In the past, automobile engines usually use the engine shaft to drive the belt, and the belt drives the water pump to run. In this way, when the engine is working, the main shaft rotates, the water pump is driven, and the cooling water can circulate to cool the en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01P5/12F01P7/16F01P11/00H02P6/06H02P6/08H02P23/04H02P23/12
CPCF01P5/12F01P7/164F01P11/00H02P6/06H02P6/08H02P23/04H02P23/12
Inventor 汤廷孝
Owner NINGBO UNIV