CN111086551B - Steering wheel heating control method based on temperature closed-loop adjustment - Google Patents
Steering wheel heating control method based on temperature closed-loop adjustment Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D1/00—Steering controls, i.e. means for initiating a change of direction of the vehicle
- B62D1/02—Steering controls, i.e. means for initiating a change of direction of the vehicle vehicle-mounted
- B62D1/04—Hand wheels
- B62D1/06—Rims, e.g. with heating means; Rim covers
- B62D1/065—Steering wheels with heating and ventilating means
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Abstract
The invention discloses a steering wheel heating control method based on temperature closed-loop regulation, which comprises several key control factors of heating target temperature, real-time temperature, temperature difference between the heating target temperature and the real-time temperature, corresponding PWM duty ratio increment obtained according to a PID (proportion integration differentiation) regulation algorithm of the temperature difference, PWM (pulse-width modulation) wave duty ratio actually controlled and output, voltage duty ratio controlled and power output controlled by a heating element. The invention has the beneficial effects that: the output power of the steering wheel heating execution element is automatically adjusted through a PID (proportion integration differentiation) adjusting algorithm based on the difference value between the real-time temperature and the heating target temperature, so that the accurate control of the steering wheel temperature is achieved, meanwhile, the heating element driving module is adopted to directly drive the power output of the heating element, the disadvantages of short contact service life and poor maintainability brought by a relay are eliminated, and the cost of a steering wheel heating system is reduced.
Description
Technical Field
The invention relates to the technical field of automobile parts, in particular to a steering wheel heating control method based on temperature closed-loop adjustment.
Background
With the rapid development of the automobile industry, the wide application of new processes, new materials and new technologies in the automobile field, in particular the wide application of new electronic technologies of automobiles, makes the automobile industry change rapidly, super-automatically, intelligently and comfortably. More and more motorcycle types are equipped with steering wheel heating controller in order to pursue more comfortable more convenient functional experience, heat the steering wheel in cold season, and the driver no longer feels cold and uncomfortable when holding the steering wheel to obtain more and more driver's recognition.
A common steering wheel heating controller obtains a temperature value from a temperature sensor on a steering wheel, and then controls the relay to be closed and opened according to the temperature value, so that the temperature of the steering wheel is controlled within a certain range.
See fig. 1. A control connection block diagram of a general steering wheel heating system is shown, which includes a steering wheel heating controller 10, a command sending instruction device 20, a temperature measuring element 30, a heating actuator 40, and a relay 50. The steering wheel heating controller 10 is composed of a communication module 11, a temperature signal processing circuit 12, a relay driving module 13 and a central control algorithm unit 14.
The first signal input/output end 14a of the central control arithmetic unit 14 is connected with the first signal input/output end 11a of the communication module 11, the signal input end 14b of the central control arithmetic unit 14 is connected with the output end 12a of the temperature signal processing circuit module 12, and the third signal output end 14c of the central control arithmetic unit 14 is connected with the input end 13a of the relay driving module 13. The signal input/output terminal 20a of the command sending instruction device 20 is connected to the second signal input/output terminal 11b of the communication module 11, the output terminal 30a of the temperature measuring element 30 is connected to the first input terminal 12b of the temperature signal processing circuit module 12, the output terminal 40a of the heating actuator 40 is connected to the first output terminal 50b of the relay 50, and the input terminal 50a of the relay 50 is connected to the output terminal 13b of the relay driving module 13.
When the command is sent to the steering wheel heating request command sent by the command sending device 20, the communication module 11 transmits a signal to the central control operation unit 14, and the central control operation unit 14 obtains a real-time temperature signal obtained by the temperature signal processing circuit module 12 and then compares the real-time temperature signal with a preset temperature heating lower limit value. If the real-time temperature is lower than the preset temperature heating lower limit value, the relay driving module 13 is driven to pull in the relay 50, so that the heating execution element 40 is controlled to perform full-power heating. If the obtained real-time temperature is higher than the preset temperature heating lower limit value, the relay driving module 13 is not driven, the relay maintains the off state, and the heating execution element 40 does not heat. In the heating process, if the obtained real-time temperature is higher than the preset temperature heating upper limit value, the relay 50 is switched off, the heating of the heating execution element 40 is stopped, and thus the steering wheel temperature is controlled in a certain area range in a circulating mode.
However, in the method for controlling the heating of the steering wheel, the actuation and the disconnection of the relay are controlled by presetting the upper and the lower temperature limit values to drive the steering wheel heating execution element, and the actuation and the disconnection of the relay are controlled, so that the method only has two states of full power output or zero power output, and has the defect of single power output; heating and non-heating are controlled through a preset temperature upper and lower limit threshold, and the defect of poor temperature control precision is overcome; relays have the disadvantages of short contact life, poor maintainability, high price and cost, etc.
The applicant has made an advantageous search and attempt to find a solution to the above-mentioned drawbacks, based on a method for controlling the heating of the steering wheel with closed-loop regulation of the temperature, in which the solution to be described below is made.
Disclosure of Invention
The invention aims to: the steering wheel heating control method based on temperature closed-loop regulation is provided, the temperature is used as a closed loop, the output power of a heating execution element related to a steering wheel is regulated, the accurate control of the temperature of the steering wheel is realized, and the negative influence caused by the control output of a relay is eliminated.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a steering wheel heating control method based on temperature closed-loop regulation is characterized in that a temperature difference value is made between a temperature value acquired in real time and a target temperature value to be controlled, PID control algorithm operation is made based on the temperature difference value, a required PWM duty ratio is output, and finally voltage output on a heating execution element is directly controlled through a heating element driving module, so that heating output power of the heating execution element is controlled, and accurate control of the heating temperature of a steering wheel is achieved.
In a preferred embodiment of the present invention, the steering wheel heating control system comprises a temperature measuring element, a temperature signal processing circuit, a central control arithmetic unit, a heating element driving module, a heating execution element, a communication module, and a command sending instruction device; the steering wheel heating request instruction signal and the heating target temperature instruction signal sent by the command sending instruction device are transmitted to the central control arithmetic unit through the communication module; the central control arithmetic unit makes a difference between the heating target temperature instruction signal and the real-time temperature signal obtained by the temperature signal acquisition processing circuit module to obtain a temperature difference value; the central control operation unit calculates the duty ratio of the output PWM wave according to the obtained temperature difference value, inputs the duty ratio into the heating element driving module, directly drives the heating execution element to output the adaptive heating power through the heating element driving module, and simultaneously measures the temperature after execution through the temperature measurement element to finish closed-loop regulation.
In a preferred embodiment of the present invention, the steering wheel heating control system comprises a temperature measuring element, a temperature signal processing circuit, a central control arithmetic unit, a heating element driving module, a heating execution element, a communication module, and a command sending instruction device; the command sending device sends a steering wheel heating request command signal, and the steering wheel heating request command signal is transmitted to the central control arithmetic unit through the communication module; after the central control arithmetic unit receives the steering wheel heating request instruction signal, the central control arithmetic unit makes a difference between a heating target temperature instruction signal preset in the central control arithmetic unit and a real-time temperature signal obtained by the temperature signal acquisition processing circuit module to obtain a temperature difference value; the central control operation unit calculates the duty ratio of the output PWM wave according to the obtained temperature difference value, inputs the duty ratio into the heating element driving module, directly drives the heating execution element to output the adaptive heating power through the heating element driving module, and simultaneously measures the temperature after execution through the temperature measurement element to finish closed-loop regulation.
In a preferred embodiment of the present invention, in the steering wheel heating control process, a temperature difference is made between a temperature value obtained in real time and a target temperature value to be controlled, and a corresponding PWM wave duty ratio increment and a duty ratio of PWM actual control output are obtained according to a PID adjustment algorithm of the temperature difference, so as to control output power on the output heating execution element.
In a preferred embodiment of the present invention, the steering wheel heating control method based on temperature closed-loop regulation specifically comprises the following steps:
the method comprises the following steps: the initial duty ratio of the PWM wave of the initial default output is zero. The steering wheel temperature measuring element measures the real-time temperature of the steering wheel, the real-time temperature data are transmitted to the central control arithmetic unit through the temperature signal processing circuit, the central control arithmetic unit converts the temperature data into controllable real-time temperature, and the controllable real-time temperature is different from the heating target temperature to obtain a temperature phase difference value.
Step two: if a heating command exists, PID calculation is carried out based on the obtained temperature phase difference value, the adaptive increase/decrease of the PWM wave duty ratio output is obtained, the adaptive increase/decrease is superposed on the output PWM duty ratio and is used as the PWM duty ratio to be output, the PWM duty ratio is output to the heating element driving module, the input voltage of the heating execution element is controlled, the output power of the heating execution element is further controlled, if the output power of the heating execution element is larger than the heat dissipation power, the temperature of the steering wheel is increased, if the output power of the heating execution element is smaller than the heat dissipation power, the steering wheel is cooled, and if the output power of the heating execution element is equal to the heat dissipation power, the steering wheel maintains the original temperature, so that the temperature after the steering wheel is controlled to be heated is accurately controlled.
Due to the adoption of the technical scheme, the invention has the beneficial effects that: the output power of the steering wheel heating execution element is automatically adjusted through a PID (proportion integration differentiation) adjusting algorithm based on the difference value between the real-time temperature and the heating target temperature, so that the accurate control of the steering wheel temperature is achieved, meanwhile, the heating element driving module is adopted to directly drive the power output of the heating element, the disadvantages of short contact service life and poor maintainability brought by a relay are eliminated, and the cost of a steering wheel heating system is reduced.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a control connection block diagram of a general steering wheel heating system.
Fig. 2 is a connection block diagram of a steering wheel heating control system based on temperature closed-loop regulation according to the present invention.
Fig. 3 is a schematic block diagram of a steering wheel heating control method based on temperature closed-loop regulation according to the invention.
Fig. 4 is a flow chart of a steering wheel heating control method based on temperature closed-loop regulation according to the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained by combining the specific figure below to control the power output of a steering wheel heating actuator so that the corresponding steering wheel temperature is controlled at the target temperature.
For convenience of explanation, referring to fig. 2, fig. 2 is a connection block diagram of a steering wheel heating control system based on temperature closed-loop regulation. Wherein it comprises a steering wheel heating controller 10, a command sending instruction device 20, a temperature measuring element 30, a heating actuator 40. The steering wheel heating controller 10 is composed of a communication module 11, a temperature signal processing circuit 12, a heating element driving module 13, and a central control algorithm unit 14.
The first signal input/output end 14a of the central control arithmetic unit 14 is connected with the first signal input/output end 11a of the communication module 11, the signal input end 14b of the central control arithmetic unit 14 is connected with the output end 12a of the temperature signal processing circuit module 12, and the third signal output end 14c of the central control arithmetic unit 14 is connected with the input end 13a of the heating element driving module 13. The signal input/output end 20a of the command sending instruction device 20 is connected with the second signal input/output end 11b of the communication module 11, the output end 30a of the temperature measuring element 30 is connected with the first input end 12b of the temperature signal processing circuit module 12, and the output end 40a of the heating execution element 40 is connected with the first output end 13b of the heating element driving module 13.
The command sending command device 20 sends a steering wheel heating request command and a heating target temperature, the heating target temperature may also be preset in the central control arithmetic unit 14, the communication module 11 transmits a signal to the central control arithmetic unit 14, and the central control arithmetic unit 14 obtains a real-time temperature signal obtained by the temperature signal processing circuit module 12. And obtaining a temperature difference value by making a difference with the heating target temperature. When the command sending command device 20 sends a command for requesting to heat the steering wheel, the central control arithmetic unit 14 calculates the duty ratio of the output PWM wave according to the obtained temperature difference, inputs the duty ratio into the heating element driving module 13, and directly drives the heating actuator 40 to output the corresponding heating power through the heating element driving module 13.
For further control explanation, referring to fig. 3 and 4, a control schematic block diagram of a steering wheel heating control method based on temperature closed-loop regulation is shown in fig. 3. Fig. 4 is a flow chart of a steering wheel heating control method based on temperature closed-loop regulation.
The target temperature to which the steering wheel is heated is referred to as a heating target temperature T0.
The actual temperature measured by the steering wheel temperature measuring element is referred to as the real-time temperature Tx.
The difference between the heating target temperature T0 on the steering wheel system and the real-time temperature Tx is referred to as a temperature difference Δ T.
The temperature PID regulation algorithm based on the temperature difference is called a temperature difference PID regulation algorithm.
The increase/decrease of the PWM wave duty ratio obtained by the temperature difference PID regulating algorithm is collectively called as the increase/decrease Delta D of the PWM wave duty ratio.
The duty ratio of the voltage output to the steering wheel heating actuator is referred to as a PWM wave output duty ratio Dx.
The heating target temperature T0 and the real-time temperature Tx are differed to obtain a temperature difference Delta T, namely the Delta T is T0-Tx, and the temperature difference Delta T is input into a time difference PID adjusting algorithm, and the formula is as follows:
△D(k)＝Kp*(△T(k)-△T(k-1))+Ki*△T(k)+Kd*(△T(k)-2*△T(k-1)+△T(k-2))，
in the formula, Δ d (k) is the PWM wave duty ratio increase/decrease of the kth output; Δ T (k) is the value of Δ T at kth time; DeltaT (k-1) is the value of DeltaT at the k-1 st time; DeltaT (k-2) is the value of DeltaT at the k-2 th time; kp is a proportional parameter, Ki is an integral parameter, and Kd is a derivative parameter.
And performing PID operation to obtain the increase/decrease quantity Delta D of the duty ratio of the PWM wave to be output, superposing the increase/decrease quantity Delta D of the duty ratio of the PWM wave to be output on the duty ratio of the last output to obtain the total output duty ratio Dx of the PWM wave, and converting the total output duty ratio Dx of the PWM wave into the voltage duty ratio loaded on the heating execution element through the heating element driving module, thereby controlling the power output of the heating execution element, further controlling the temperature change of the steering wheel, simultaneously feeding back the real-time temperature Tx and completing the closed-loop regulation of the temperature.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A steering wheel heating control method based on temperature closed-loop adjustment is characterized in that: the temperature difference value is made by the temperature value acquired in real time and the target temperature value to be controlled, PID control algorithm operation is made based on the temperature difference value, the required PWM wave duty ratio is output, and finally the voltage output on the heating execution element is directly controlled through the heating element driving module, so that the heating output power of the heating execution element is controlled, and the accurate control of the heating temperature of the steering wheel is realized;
the steering wheel heating control method based on temperature closed-loop adjustment comprises the following specific steps:
the method comprises the following steps: the initial duty ratio of the PWM wave output by initial default is zero, a temperature measuring element of the steering wheel measures the real-time temperature of the steering wheel, the real-time temperature data is transmitted to a central control arithmetic unit through a temperature signal processing circuit, the central control arithmetic unit converts the temperature data into controllable real-time temperature, and the controllable real-time temperature and the heating target temperature are subjected to difference value to obtain a temperature difference value;
step two: if a heating command exists, PID calculation is carried out based on the obtained temperature difference value, the adaptive increase/decrease of PWM wave duty ratio output is obtained, the adaptive increase/decrease is superposed on the output PWM duty ratio and is used as the PWM wave duty ratio to be output, the PWM wave duty ratio is output to the heating element driving module, so that the input voltage of the heating execution element is controlled, the output power of the heating execution element is further controlled, if the output power of the heating execution element is greater than the heat dissipation power, the steering wheel is heated, if the output power of the heating execution element is less than the heat dissipation power, the steering wheel is cooled, and if the output power of the heating execution element is equal to the heat dissipation power, the steering wheel maintains the original temperature, so that the accurate control of the temperature after the steering wheel is heated is realized; the specific formula is as follows:
the target temperature to which the steering wheel is heated is referred to as a heating target temperature T0;
the actual temperature obtained by measuring data by a temperature measuring element of the steering wheel is called as real-time temperature Tx;
the difference between the heating target temperature T0 on the steering wheel system and the real-time temperature Tx is referred to as a temperature difference Δ T;
the temperature PID adjusting algorithm based on the temperature difference is called as a temperature difference PID adjusting algorithm;
the increase/decrease of the PWM wave duty ratio obtained by the temperature difference PID regulation algorithm is collectively called as the increase/decrease Delta D of the PWM wave duty ratio;
the duty ratio of the voltage output to the heating actuator of the steering wheel is referred to as a PWM wave output duty ratio Dx;
heating target temperature T0 and real-time temperature Tx to obtain temperature difference DeltaT, namely DeltaT = T0-Tx, inputting the temperature difference DeltaT into a temperature difference PID regulating algorithm, wherein the formula is that DeltaD (k) = Kp ([ delta ] T (k) ([ delta ] T (k-1)) + Ki [ delta ] T (k) + Kd ([ delta ] T (k) — 2- [ delta ] T (k-1) + [ delta ] T (k-2)),
in the formula, Δ d (k) is the PWM wave duty ratio increase/decrease of the kth output; DeltaT (k) is the value of DeltaT at the kth time, DeltaT (k-1) is the value of DeltaT at the kth time to 1 time, DeltaT (k-2) is the value of DeltaT at the kth time to 2 times, Kp is a proportional parameter, Ki is an integral parameter, and Kd is a derivative parameter.
2. The steering wheel heating control method based on temperature closed-loop regulation of claim 1 is applied to a steering wheel heating control system, wherein the steering wheel heating control system comprises a temperature measuring element, a temperature signal processing circuit, a central control arithmetic unit, a heating element driving module, a heating execution element, a communication module and a command sending instruction device; the steering wheel heating request instruction signal and the heating target temperature instruction signal sent by the command sending instruction device are transmitted to the central control arithmetic unit through the communication module; the central control arithmetic unit makes a difference between the heating target temperature instruction signal and the real-time temperature signal obtained by the temperature signal acquisition processing circuit to obtain a temperature difference value; the central control operation unit calculates the duty ratio of the output PWM wave according to the obtained temperature difference value, inputs the duty ratio into the heating element driving module, directly drives the heating execution element to output the adaptive heating power through the heating element driving module, and simultaneously measures the temperature after execution through the temperature measurement element to finish closed-loop regulation.
3. The steering wheel heating control method based on temperature closed-loop regulation of claim 1 is applied to a steering wheel heating control system, wherein the steering wheel heating control system comprises a temperature measuring element, a temperature signal processing circuit, a central control arithmetic unit, a heating element driving module, a heating execution element, a communication module and a command sending instruction device; the command sending device sends a steering wheel heating request command signal, and the steering wheel heating request command signal is transmitted to the central control arithmetic unit through the communication module; after the central control arithmetic unit receives the steering wheel heating request instruction signal, the central control arithmetic unit makes a difference between a heating target temperature instruction signal preset in the central control arithmetic unit and a real-time temperature signal obtained by the temperature signal acquisition processing circuit to obtain a temperature difference value; the central control operation unit calculates the duty ratio of the output PWM wave according to the obtained temperature difference value, inputs the duty ratio into the heating element driving module, directly drives the heating execution element to output the adaptive heating power through the heating element driving module, and simultaneously measures the temperature after execution through the temperature measurement element to finish closed-loop regulation.
4. The steering wheel heating control method based on temperature closed-loop regulation as claimed in claim 1, wherein in the steering wheel heating control method, a temperature difference is made between a temperature value obtained in real time and a target temperature value to be controlled, and a corresponding PWM wave duty ratio increment and a duty ratio of actual PWM wave control output are obtained according to a PID regulation algorithm of the temperature difference, so as to control output power on an output heating execution element.
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| CN111799530A (en) * | 2020-07-20 | 2020-10-20 | 上海金脉电子科技有限公司 | Heater power closed-loop control system and power closed-loop control method |
| CN112034903B (en) * | 2020-07-31 | 2022-02-22 | 未来穿戴技术有限公司 | Heating method of massage apparatus, and computer-readable storage medium |
| CN113081230A (en) * | 2021-03-23 | 2021-07-09 | 上海导向医疗***有限公司 | Temperature measurement and rewarming integrated device and cryotherapy system |
| CN114275031A (en) * | 2022-01-27 | 2022-04-05 | 湖南大学 | Steering wheel temperature control method and system based on driver hand temperature |
| CN116124833A (en) * | 2022-11-30 | 2023-05-16 | 国网江苏省电力有限公司南通供电分公司 | Temperature-controllable electric ignition device and flash point tester with same |
| CN117394834B (en) * | 2023-12-08 | 2024-04-05 | 深圳和而泰汽车电子科技有限公司 | Switch tube control method, domain controller and automobile |
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