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Control method and driving system of electric control three-way valve in fuel cell thermal management system

A thermal management system, fuel cell technology, applied in fuel cells, circuits, electrical components, etc., can solve problems such as inaccurate temperature control, and achieve the effect of ensuring control accuracy, saving manpower and time costs

Pending Publication Date: 2022-06-28
BEIJING SINOHYTEC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above analysis, the embodiment of the present invention aims to provide a control method for the electronically controlled three-way valve in the thermal management system of the fuel cell, to solve the inaccurate temperature control of the electric three-way valve in the prior art with the accumulated switching times. The problem

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  • Control method and driving system of electric control three-way valve in fuel cell thermal management system
  • Control method and driving system of electric control three-way valve in fuel cell thermal management system

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Embodiment 1

[0053] An embodiment of the present invention discloses a control method for an electronically controlled three-way valve in a fuel cell thermal management system, such as figure 1 shown, including the following steps:

[0054] S1. Identify the moment when the electric three-way valve is in the fully open or fully closed state, and start timing;

[0055] S2. From the timing start time, collect the opening degree data of the electric three-way valve within the preset time period, and correct the driving duty ratio of the electrically controlled three-way valve according to the opening degree data;

[0056] S3. Control the electronically controlled three-way valve to execute the corrected drive duty cycle until the set learning time is reached, and identify the actual maximum opening position and actual minimum opening position of the electric three-way valve after the drive duty cycle is corrected. , and then correct the set position of the electric three-way valve (set the ma...

Embodiment 2

[0060] On the basis of embodiment 1, improve, also include the following steps:

[0061] S01. Determine the characteristic curve of the opening degree of the electric three-way valve changing with the number of switches, such as figure 2 shown;

[0062] S02. According to the above characteristic curve, determine the time period during which the electric three-way valve enters the self-learning correction, as well as the initial learning time t0, learning time t1, maximum opening B1, and minimum opening B2 in each time period; Each time the opening degree change rate of the three-way valve decreases by a fixed ratio, a self-learning correction is performed, and the learning time t1 is greater than an integer multiple of the drive period set by the factory. The maximum opening B1 and the minimum opening B2 are also the initial installed values ​​provided by the electric three-way valve manufacturer.

[0063] Preferably, during each self-learning correction, the preset time pe...

Embodiment 3

[0085] The present invention also discloses a driving system for an electronically controlled three-way valve in a fuel cell thermal management system corresponding to the method in Embodiment 1 or 2, comprising a controller and an electronically controlled three-way valve connected in sequence.

[0086] The controller is used to control the start of the electronically controlled three-way valve; and, after the electronically controlled three-way valve is started, identify whether to enter the self-learning correction stage; if so, identify the moment when the electric three-way valve is in a fully open or fully closed state, Start timing, collect the opening data of the electric three-way valve within the preset time period from the time when the timing starts, and correct the driving duty ratio of the electronically controlled three-way valve according to the opening data, and then control the electronically controlled three-way valve. The through valve executes the corrected...

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Abstract

The invention provides a control method and a driving system of an electric control three-way valve in a fuel cell thermal management system, belongs to the technical field of fuel cells, and solves the problem that the temperature control of the electric three-way valve is inaccurate along with the accumulation of switching times in the prior art. The method comprises the following steps: identifying the moment when the electric three-way valve is in a full-open or full-closed state, and starting timing; starting from the timing starting moment, collecting opening degree data of the electric three-way valve in a preset time period, and correcting the driving duty ratio of the electric three-way valve according to the opening degree data; the electric control three-way valve is controlled to execute the corrected driving duty ratio until the set learning time is reached, timing is ended, the actual maximum opening position and the actual minimum opening position of the electric three-way valve after the driving duty ratio is corrected are recognized, and then the set position of the electric three-way valve is corrected. The defect of feedback position deviation caused by switching frequency accumulation of the electric three-way valve is eliminated, and the thermal management control precision of the fuel cell is ensured.

Description

technical field [0001] The invention relates to the technical field of fuel cells, in particular to a control method and a driving system of an electronically controlled three-way valve in a fuel cell thermal management system. Background technique [0002] A fuel cell is an electrochemical reaction device that generates water by reacting hydrogen and oxygen in two half-electrodes, respectively, converting chemical energy into electrical energy and, at the same time, into heat energy with loss of efficiency. [0003] However, the fuel cell engine needs to achieve the best conversion efficiency in a specific temperature range under different powers, so only thermal management of the fuel cell is required. In the fuel cell thermal management system, an electric three-way valve is usually used to adjust the flow of cold and hot coolant, so as to control the temperature of the fuel cell and make the fuel cell work within the optimal operating temperature range. [0004] In the ...

Claims

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Application Information

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IPC IPC(8): H01M8/04029H01M8/04992
CPCH01M8/04029H01M8/04992Y02E60/50
Inventor 刘秀会韩竹李飞强赵兴旺
Owner BEIJING SINOHYTEC
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