CN116928426A - Electromagnetic valve temperature calculating method, system and storage medium - Google Patents

Abstract

The application discloses a solenoid valve temperature calculating method, a system and a storage medium, wherein the solenoid valve temperature calculating method comprises the following steps: s1, calibrating an electromagnetic valve to obtain a relation curve of the resistance, the inductance value and the temperature of the electromagnetic valve under the states of different switching frequencies and duty ratios of a switch of an electromagnetic valve control circuit; s2, performing current closed-loop control on the electromagnetic valve, collecting the switching frequency and/or the duty ratio of an electromagnetic valve control circuit, and inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve. The application does not need a temperature sensor, can rapidly and accurately obtain the actual temperature of the electromagnetic valve, and can effectively reduce the production and use cost of the electromagnetic valve.

Description

Electromagnetic valve temperature calculating method, system and storage medium

Technical Field

The application relates to the field of automobiles, in particular to a battery valve temperature calculating method, a battery valve temperature calculating system and a storage medium.

Background

Currently, in the field of automobile actuator control, an electromagnetic valve is widely used as an actuator to drive an actuating mechanism to act, the electromagnetic valve is controlled to be opened at a high speed and with a large current, in order to prevent the temperature from being too high, the attraction state is maintained by a small current, the stable and reliable operation of the electromagnetic valve is ensured, and the actual temperature of the electromagnetic valve needs to be obtained by a controller. The temperature sensor is integrated in the electromagnetic valve, so that the manufacturing difficulty of the electromagnetic valve is greatly increased, and the production and use cost of the electromagnetic valve is increased intangibly.

Chinese patent 201811652724.9 relates to a control system and a control method for an automobile electronic vacuum booster, and belongs to the field of automobile electronic vacuum booster control. The battery is respectively and electrically connected with the voltage conversion and monitoring module and the field effect tube driving module through the fuse, the voltage conversion and monitoring module is used for supplying power to each module, the MCU is used for collecting signals in real time, the MCU controls the field effect tube driving module and the electromagnetic valve driving module, and the safety monitoring module sends abnormal information to the MCU for processing in real time. The scheme discloses a solenoid valve temperature conversion module which converts a current value of a solenoid valve into a voltage value and transmits the voltage value to an MCU, calculates current feedback and time through the MCU, and calculates the temperature of the solenoid valve by an interpolation method through a current, temperature and time interpolation table; the current, temperature and time interpolation table is used for obtaining a data curve of the current, temperature and time of the electromagnetic valve in a vacuum state of-50 kpa to-70 kpa through a large number of experiments. The test method is that signals such as a temperature sensor is added on an electromagnetic valve of an electronic vacuum booster, a current sensor is added on a driving wire, a vacuum degree sensor is added on the booster and the like are transmitted to a singlechip, and the signals are tested on a real vehicle to obtain data. The scheme is realized by adding a temperature sensor on the electromagnetic valve, so that the manufacturing difficulty and cost cannot be reduced.

Chinese patent 201510582240.1 discloses a proportional solenoid valve temperature compensation method based on constant current control, which comprises the following steps: the electronic control unit collects analog quantity signals; temperature compensation is carried out on the proportional electromagnetic valve; the comparative solenoid valve was subjected to constant current control. According to the application, the influence of the hydraulic oil characteristic change caused by temperature change and the physical characteristic change of the proportional electromagnetic valve on the gear shifting process is distinguished, the proportional electromagnetic valve current characteristic change caused by the two factors is respectively controlled, the electromagnetic valve current value is set through oil temperature compensation, and the constant current control of the proportional electromagnetic valve is realized through the constant current control circuit, so that the gear shifting comfort is improved. The scheme also needs a temperature sensor to collect temperature, so that the manufacturing difficulty and cost cannot be reduced.

Disclosure of Invention

In the summary section, a series of simplified form concepts are introduced that are all prior art simplifications in the section, which are described in further detail in the detailed description section. The summary of the application is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.

The application aims to provide a solenoid valve temperature calculation method and a solenoid valve temperature calculation system which can quickly and accurately obtain the actual working temperature of a battery valve under the condition that a temperature sensor is not used.

In order to solve the technical problems, the electromagnetic valve temperature calculating method provided by the application comprises the following steps:

s1, calibrating an electromagnetic valve to obtain a relation curve of the resistance, the inductance value and the temperature of the electromagnetic valve under the states of different switching frequencies and duty ratios of a switch of an electromagnetic valve control circuit;

s2, performing current closed-loop control on the electromagnetic valve, collecting the switching frequency and/or the duty ratio of an electromagnetic valve control circuit, and inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve.

Optionally, the electromagnetic valve temperature calculating method is further improved, and the electromagnetic valve temperature calculating method is characterized in that one control period T of the current closed-loop control comprises sub-times T1-T7;

t1 is the phase time of the heavy current, in this time interval, the field effect tube is turned on, the electric current rises rapidly, reach the peak current;

t2 is a peak phase, current is kept to fluctuate near peak current by continuously switching on and off the field effect tube in the time period, and the current is reduced by switching off the field effect tube when the current reaches a peak current value;

t3 is the peak off time, which is the time for switching off the field effect transistor in the peak phase, which is set, in the peak phase, when the current reaches the peak current value, the field effect transistor is switched off for T3 time, the current drops, then the field effect transistor is immediately conducted, and the current rises until the current reaches the peak current value, the field effect transistor is continuously switched off, and the process is repeated, so that the current value always fluctuates near the peak current value, and a plurality of T3 are included in the T2 time;

t4 is a current bypass phase, and all field effect transistors are disconnected in the time period, so that the current rapidly drops to a holding current value;

t5 is a holding phase during which the holding current always fluctuates around the holding current value;

t6 is a hold off time, which is a hold phase period, the off time of the field effect transistor is set, the time is changed, in the hold phase period, when the current reaches a hold current value, the field effect transistor is turned off for T5, the current is reduced, then the field effect transistor is immediately turned on, the current is increased until the current reaches the hold current value, the field effect transistor is continuously turned off, and the process is repeated in such a way that the current value always fluctuates in the hold current value accessory, and in the T5 period, a plurality of T6 are included

T7 is the end phase, all field effect transistors are disconnected at the moment, and the current rapidly drops to 0;

t2, T3, T4, T5 and T6 are fixed designated durations, and the current rise times in the T1, T7 and T2, T3 periods are determined according to the inductance and resistance values of the actuator during operation.

To solve the above-mentioned problems, the present application provides a computer readable storage medium having a computer program stored therein, the computer program when executed is configured to implement the steps in the solenoid valve temperature calculating method.

In order to solve the above technical problems, the electromagnetic valve temperature calculating system provided by the present application includes:

the main control chip is used for controlling the execution state of the intelligent pre-driving chip, collecting the switching frequency and the duty ratio of the switch of the electromagnetic valve control circuit, and pre-storing the relation curves of the resistance, the inductance value and the temperature of the electromagnetic valve under the different switching frequencies and the duty ratio states of the switch of the electromagnetic valve control circuit; inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve;

the intelligent pre-driving chip is used for collecting the loop current of the electromagnetic valve, calculating and outputting the switch control current to the control circuit switch according to the loop current of the electromagnetic valve, and enabling the control circuit switch to execute specified current closed-loop control.

Optionally, the electromagnetic valve temperature calculating system is further improved, and one control period T of the current closed-loop control comprises sub-times T1 to T7;

t1 is the phase time of the heavy current, in this time interval, the field effect tube is turned on, the electric current rises rapidly, reach the peak current;

t2 is a peak phase, current is kept to fluctuate near peak current by continuously switching on and off the field effect tube in the time period, and the current is reduced by switching off the field effect tube when the current reaches a peak current value;

t3 is the peak off time, which is the time for switching off the field effect transistor in the peak phase, which is set, in the peak phase, when the current reaches the peak current value, the field effect transistor is switched off for T3 time, the current drops, then the field effect transistor is immediately conducted, and the current rises until the current reaches the peak current value, the field effect transistor is continuously switched off, and the process is repeated, so that the current value always fluctuates near the peak current value, and a plurality of T3 are included in the T2 time;

t4 is a current bypass phase, and all field effect transistors are disconnected in the time period, so that the current rapidly drops to a holding current value;

t5 is a holding phase during which the holding current always fluctuates around the holding current value;

t6 is a hold off time, which is a hold phase period, the off time of the field effect transistor is set, the time is changed, in the hold phase period, when the current reaches a hold current value, the field effect transistor is turned off for T5, the current is reduced, then the field effect transistor is immediately turned on, the current is increased until the current reaches the hold current value, the field effect transistor is continuously turned off, and the process is repeated in such a way that the current value always fluctuates in the hold current value accessory, and in the T5 period, a plurality of T6 are included

T7 is the end phase, all field effect transistors are disconnected at the moment, and the current rapidly drops to 0;

t2, T3, T4, T5 and T6 are fixed designated durations, and the current rise times in the T1, T7 and T2, T3 periods are determined according to the inductance and resistance values of the actuator during operation.

The working principle and the technical effect of the application are further described as follows:

in the use process of the electromagnetic valve, the rising and falling range of the current is controlled by a MOS switch mode of a control circuit, so that the magnetic force of the electromagnetic valve is ensured to be stable, a relatively stable electromagnetic valve driving current is required, and the electromagnetic valve is usually controlled by a closed loop control current mode.

Based on the current closed loop control, the on-off duty ratio and frequency of the circuit for controlling the current are related to the voltage in the circuit, the resistance of the solenoid valve, the inductance of the solenoid valve and the like. The resistance and inductance of the solenoid valve have a certain correspondence with temperature (the temperature rise resistance increases, the current rise speed becomes slow, and the MOS on time becomes long). Therefore, in the use process, the switching frequency and the duty ratio of the circuit are counted, and then the inductance and the resistance value of the electromagnetic valve can be obtained. And obtaining curves corresponding to the inductance, the resistance and the temperature through actual calibration of the electromagnetic valve. The inductance and the resistance of the electromagnetic valve can be obtained through the switching frequency and the duty ratio of a circuit in closed-loop control, and the actual temperature value of the electromagnetic valve is obtained according to the corresponding curves of the inductance, the resistance and the temperature.

The application does not need a temperature sensor, can rapidly and accurately obtain the actual temperature of the electromagnetic valve, and can effectively reduce the production and use cost of the electromagnetic valve.

Drawings

The accompanying drawings are intended to illustrate the general features of methods, structures and/or materials used in accordance with certain exemplary embodiments of the application, and supplement the description in this specification. The drawings of the present application, however, are schematic illustrations that are not to scale and, thus, may not be able to accurately reflect the precise structural or performance characteristics of any given embodiment, the present application should not be construed as limiting or restricting the scope of the numerical values or attributes encompassed by the exemplary embodiments according to the present application. The application is described in further detail below with reference to the attached drawings and detailed description:

FIG. 1 is a timing diagram of one possible embodiment of the present application for providing current closed loop control.

FIG. 2 is a schematic diagram of a solenoid valve temperature calculation system according to the present application.

Detailed Description

Other advantages and technical effects of the present application will become more fully apparent to those skilled in the art from the following disclosure, which is a detailed description of the present application given by way of specific examples. The application may be practiced or carried out in different embodiments, and details in this description may be applied from different points of view, without departing from the general inventive concept. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. The following exemplary embodiments of the present application may be embodied in many different forms and should not be construed as limited to the specific embodiments set forth herein. It should be appreciated that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the technical solution of these exemplary embodiments to those skilled in the art. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present. In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening elements present. Like reference numerals refer to like elements throughout the several views.

A first embodiment;

the application provides a solenoid valve temperature calculation method, which comprises the following steps:

s1, calibrating an electromagnetic valve to obtain a relation curve of the resistance, the inductance value and the temperature of the electromagnetic valve under the states of different switching frequencies and duty ratios of a switch of an electromagnetic valve control circuit;

s2, performing current closed-loop control on the electromagnetic valve, collecting the switching frequency and/or the duty ratio of an electromagnetic valve control circuit, and inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve.

In order to demonstrate the feasibility of the present application, an embodiment of current closed-loop control is provided, and it should be noted that, corresponding current closed-loop control may be designed for solenoid valves of different types, that is, the current closed-loop control provided by the present application should not be construed as limiting the current closed-loop control, and the current closed-loop control is a preferred scheme implemented by the applicant, and under the design principle of the present application, a designer may design other current closed-loop control schemes according to the type of solenoid valve and the hardware attribute thereof. Accordingly, the current closed loop control formed based on the principles of the present application should also be understood to fall within the scope of the present application.

One control period T of the current closed-loop control comprises sub-time T1-T7;

t1 is the phase time of the heavy current, in this time interval, the field effect tube is turned on, the electric current rises rapidly, reach the peak current;

t2 is a peak phase, current is kept to fluctuate near peak current by continuously switching on and off the field effect tube in the time period, and the current is reduced by switching off the field effect tube when the current reaches a peak current value;

t3 is the peak off time, which is the time for switching off the field effect transistor in the peak phase, which is set, in the peak phase, when the current reaches the peak current value, the field effect transistor is switched off for T3 time, the current drops, then the field effect transistor is immediately conducted, and the current rises until the current reaches the peak current value, the field effect transistor is continuously switched off, and the process is repeated, so that the current value always fluctuates near the peak current value, and a plurality of T3 are included in the T2 time;

t4 is a current bypass phase, and all field effect transistors are disconnected in the time period, so that the current rapidly drops to a holding current value;

t5 is a holding phase during which the holding current always fluctuates around the holding current value;

t6 is a hold off time, which is a hold phase period, the off time of the field effect transistor is set, the time is changed, in the hold phase period, when the current reaches a hold current value, the field effect transistor is turned off for T5, the current is reduced, then the field effect transistor is immediately turned on, the current is increased until the current reaches the hold current value, the field effect transistor is continuously turned off, and the process is repeated in such a way that the current value always fluctuates in the hold current value accessory, and in the T5 period, a plurality of T6 are included

T7 is the end phase, all field effect transistors are disconnected at the moment, and the current rapidly drops to 0;

t2, T3, T4, T5 and T6 are fixed designated durations, and the current rise times in the T1, T7 and T2, T3 periods are determined according to the inductance and resistance values of the actuator during operation.

A second embodiment;

the present application provides a computer-readable storage medium having stored therein a computer program which, when executed, is adapted to carry out the steps in the solenoid valve temperature calculation method described in the first embodiment.

Including both non-transitory and non-transitory, removable and non-removable media, the information storage may be implemented by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer readable media, as defined herein, does not include non-transitory computer readable media (transmission media), such as modulated data signals and carrier waves.

A third embodiment;

the application provides a solenoid valve temperature calculation system, comprising:

the main control chip is used for controlling the execution state of the intelligent pre-driving chip, collecting the switching frequency and the duty ratio of the switch of the electromagnetic valve control circuit, and pre-storing the relation curves of the resistance, the inductance value and the temperature of the electromagnetic valve under the different switching frequencies and the duty ratio states of the switch of the electromagnetic valve control circuit; inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve;

the intelligent pre-driving chip is used for collecting the loop current of the electromagnetic valve, calculating and outputting the switch control current to the control circuit switch according to the loop current of the electromagnetic valve, and enabling the control circuit switch to execute specified current closed-loop control.

In order to demonstrate the feasibility of the present application, an embodiment of current closed-loop control is provided, and it should be noted that, corresponding current closed-loop control may be designed for solenoid valves of different types, that is, the current closed-loop control provided by the present application should not be construed as limiting the current closed-loop control, and the current closed-loop control is a preferred scheme implemented by the applicant, and under the design principle of the present application, a designer may design other current closed-loop control schemes according to the type of solenoid valve and the hardware attribute thereof. Accordingly, the current closed loop control formed based on the principles of the present application should also be understood to fall within the scope of the present application.

One control period T of the current closed-loop control comprises sub-time T1-T7;

t1 is the phase time of the heavy current, in this time interval, the field effect tube is turned on, the electric current rises rapidly, reach the peak current;

t2 is a peak phase, current is kept to fluctuate near peak current by continuously switching on and off the field effect tube in the time period, and the current is reduced by switching off the field effect tube when the current reaches a peak current value;

t3 is the peak off time, which is the time for switching off the field effect transistor in the peak phase, which is set, in the peak phase, when the current reaches the peak current value, the field effect transistor is switched off for T3 time, the current drops, then the field effect transistor is immediately conducted, and the current rises until the current reaches the peak current value, the field effect transistor is continuously switched off, and the process is repeated, so that the current value always fluctuates near the peak current value, and a plurality of T3 are included in the T2 time;

t4 is a current bypass phase, and all field effect transistors are disconnected in the time period, so that the current rapidly drops to a holding current value;

t5 is a holding phase during which the holding current always fluctuates around the holding current value;

t6 is a hold off time, which is a hold phase period, the off time of the field effect transistor is set, the time is changed, in the hold phase period, when the current reaches a hold current value, the field effect transistor is turned off for T5, the current is reduced, then the field effect transistor is immediately turned on, the current is increased until the current reaches the hold current value, the field effect transistor is continuously turned off, and the process is repeated in such a way that the current value always fluctuates in the hold current value accessory, and in the T5 period, a plurality of T6 are included

T7 is the end phase, all field effect transistors are disconnected at the moment, and the current rapidly drops to 0;

t2, T3, T4, T5 and T6 are fixed designated durations, and the current rise times in the T1, T7 and T2, T3 periods are determined according to the inductance and resistance values of the actuator during operation.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The present application has been described in detail by way of specific embodiments and examples, but these should not be construed as limiting the application. Many variations and modifications may be made by one skilled in the art without departing from the principles of the application, which is also considered to be within the scope of the application.

Claims (5)

1. The electromagnetic valve temperature calculating method is characterized by comprising the following steps of:

s1, calibrating an electromagnetic valve to obtain a relation curve of the resistance, the inductance value and the temperature of the electromagnetic valve under the states of different switching frequencies and duty ratios of a switch of an electromagnetic valve control circuit;

s2, performing current closed-loop control on the electromagnetic valve, collecting the switching frequency and/or the duty ratio of an electromagnetic valve control circuit, and inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve.

2. The solenoid valve temperature calculation method according to claim 1, characterized in that:

one control period T of the current closed-loop control comprises sub-time T1-T7;

t1 is the phase time of the heavy current, in this time interval, the field effect tube is turned on, the electric current rises rapidly, reach the peak current;

t2 is a peak phase, current is kept to fluctuate near peak current by continuously switching on and off the field effect tube in the time period, and the current is reduced by switching off the field effect tube when the current reaches a peak current value;

t3 is the peak off time, which is the time for switching off the field effect transistor in the peak phase, which is set, in the peak phase, when the current reaches the peak current value, the field effect transistor is switched off for T3 time, the current drops, then the field effect transistor is immediately conducted, and the current rises until the current reaches the peak current value, the field effect transistor is continuously switched off, and the process is repeated, so that the current value always fluctuates near the peak current value, and a plurality of T3 are included in the T2 time;

t4 is a current bypass phase, and all field effect transistors are disconnected in the time period, so that the current rapidly drops to a holding current value;

t5 is a holding phase during which the holding current always fluctuates around the holding current value;

t6 is a hold off time, which is a hold phase period, the off time of the field effect transistor is set, the time is changed, in the hold phase period, when the current reaches a hold current value, the field effect transistor is turned off for T5, the current is reduced, then the field effect transistor is immediately turned on, the current is increased until the current reaches the hold current value, the field effect transistor is continuously turned off, and the process is repeated in such a way that the current value always fluctuates in the hold current value accessory, and in the T5 period, a plurality of T6 are included

T7 is the end phase, all field effect transistors are disconnected at the moment, and the current rapidly drops to 0;

t2, T3, T4, T5 and T6 are fixed designated durations, and the current rise times in the T1, T7 and T2, T3 periods are determined according to the inductance and resistance values of the actuator during operation.

3. A computer-readable storage medium, characterized by: which has stored therein a computer program which, when executed, is adapted to carry out the steps of the method for calculating the temperature of a solenoid valve according to any one of claims 1-2.

4. A solenoid valve temperature calculation system, comprising:

the main control chip is used for controlling the execution state of the intelligent pre-driving chip, collecting the switching frequency and the duty ratio of the switch of the electromagnetic valve control circuit, and pre-storing the relation curves of the resistance, the inductance value and the temperature of the electromagnetic valve under the different switching frequencies and the duty ratio states of the switch of the electromagnetic valve control circuit; inquiring the relation curve according to the switching frequency and/or the duty ratio to obtain the actual use temperature of the electromagnetic valve;

the intelligent pre-driving chip is used for collecting the loop current of the electromagnetic valve, calculating and outputting the switch control current to the control circuit switch according to the loop current of the electromagnetic valve, and enabling the control circuit switch to execute specified current closed-loop control.

5. The solenoid valve temperature calculation system of claim 4, wherein:

one control period T of the current closed-loop control comprises sub-time T1-T7;

t1 is the phase time of the heavy current, in this time interval, the field effect tube is turned on, the electric current rises rapidly, reach the peak current;

t2 is a peak phase, current is kept to fluctuate near peak current by continuously switching on and off the field effect tube in the time period, and the current is reduced by switching off the field effect tube when the current reaches a peak current value;

t3 is the peak off time, which is the time for switching off the field effect transistor in the peak phase, which is set, in the peak phase, when the current reaches the peak current value, the field effect transistor is switched off for T3 time, the current drops, then the field effect transistor is immediately conducted, and the current rises until the current reaches the peak current value, the field effect transistor is continuously switched off, and the process is repeated, so that the current value always fluctuates near the peak current value, and a plurality of T3 are included in the T2 time;

t4 is a current bypass phase, and all field effect transistors are disconnected in the time period, so that the current rapidly drops to a holding current value;

t5 is a holding phase during which the holding current always fluctuates around the holding current value;

t6 is a hold off time, which is a hold phase period, the off time of the field effect transistor is set, the time is changed, in the hold phase period, when the current reaches a hold current value, the field effect transistor is turned off for T5, the current is reduced, then the field effect transistor is immediately turned on, the current is increased until the current reaches the hold current value, the field effect transistor is continuously turned off, and the process is repeated in such a way that the current value always fluctuates in the hold current value accessory, and in the T5 period, a plurality of T6 are included

T7 is the end phase, all field effect transistors are disconnected at the moment, and the current rapidly drops to 0;

t2, T3, T4, T5 and T6 are fixed designated durations, and the current rise times in the T1, T7 and T2, T3 periods are determined according to the inductance and resistance values of the actuator during operation.