KR100794566B1 - Method for calibration of control signal of car valve by electronic control unit and system therefor - Google Patents

Abstract

A method for calibration of a vehicle valve control signal and a system thereof are provided to store calibration data of the vehicle valve control signal into a storing unit and permit the electronic control unit to calibrate the vehicle valve control signal with reference to the calibration data. A calibration system of a vehicle valve control signal, includes an electronic control unit(10), a PWM driving unit(50), a valve unit(100), a current measuring unit(70), and a current receiving unit(60). The electronic control unit is connected to a volatile storing unit(20) and a non-volatile storing unit(30) in which programs for driving the electronic control unit are stored. The programs are downloaded into the electronic control unit from a computer(300) connected to a communication unit(40). The electronic control unit outputs a valve control signal constituted by a pulse signal modulated in a PWM system. The PWM driving unit takes, as an input, the valve control signal from the electronic control unit, and outputs a valve driving signal having a current value to the valve unit in accordance with the input valve control signal. The valve unit starts a hydraulic pressure generating unit(200) in accordance with the opening/closing of the valve performed in proportion to the current value of the valve driving signal applied from the PWM driving unit. The current measuring unit measures current value of the valve control signal when current is applied to the valve unit from the PWM driving unit. The current receiving unit receives the valve driving signal applied to the valve unit through feedback, and inputs the valve driving signal to the electronic control unit.

Description

METHOD FOR CALIBRATION OF CONTROL SIGNAL OF CAR VALVE BY ELECTRONIC CONTROL UNIT AND SYSTEM THEREFOR}

1 is a block diagram of a calibration system of the present invention;

2 is a flowchart of the calibration method of the present invention.

Explanation of symbols on the main parts of the drawings

10; An electronic control unit 20; Volatile reservoir

30; Nonvolatile storage device 40; Communication

50; A PWM driver 60; Current receiver

70; Current measuring unit

100; Valve unit 200; Hydraulic generating equipment

300; computer

The present invention relates to a method and a system for calibrating a valve control signal by an electronic control unit of a vehicle. More specifically, the electronic control unit (ECU) of the vehicle is configured to adjust the valve closing amount by a pulse width modulation (PWM) method. Outputs a valve control signal to be adjusted, the current value applied to the valve is controlled according to the output valve control signal to control the opening and closing degree of the valve, the electronic control unit unit feedback the current value applied to the valve feedback current A method and system for calibrating a valve control signal by an electronic control unit of a vehicle configured to calibrate the valve control signal based on a value.

In general, a vehicle is equipped with an electronic control unit (ECU) to control the vehicle's drive system, braking system, steering system, display system, sensor system, and the like electronically. The electronic control unit controls the driving of a target board connected by a data communication line using a controller area network (CAN) communication method, and the electronic control unit typically controls a high speed microprocessor unit (MPU). Analyze data input and output from the target board, and perform drive control of the target board according to the analysis result, and the target board controls the drive system (engine, automatic transmission, etc.) and braking system of the vehicle according to the control of the electronic control unit. (Brake, ABS, etc.), steering system (steering motor, hydraulic equipment, etc.), display system (eg, dashboard), sensor system (flow sensor, etc.) is operated.

In particular, a vehicle such as heavy equipment has a choke valve or solenoid valve that controls the amount of hydraulic pressure applied to a hydraulic system that moves the movable portion to move various movable portions such as an arm or a bucket. A proportional control valve, such as a valve, is provided, and the electronic control unit electronically controls the control of the opening and closing amount of the proportional control valve.

In the conventional control method of the proportional control valve by the electronic control unit, the electronic control unit outputs a valve control signal of a pulse having a predetermined frequency in accordance with the degree of opening and closing of the valve, the current according to the pulse frequency of the output valve control signal In the generating circuit, a current having a predetermined current value is generated, and the generated current is applied to the valve, and the opening and closing amount of the valve is controlled in accordance with the applied current value.

However, when the preset frequency of the pulse output by the electronic control unit does not match the actual opening and closing amount of the valve, the valve control is calibrated with the frequency value so that the electronic control unit satisfies the actual opening and closing amount of the valve. In order to output a signal, in the conventional calibration method, a driver adjusts a control knob having a variable resistor to input a calibration control signal to a universal port for input of an electronic control unit to calibrate a frequency of a valve control signal.

However, this conventional calibration method requires a separate compensation circuit to compensate for chattering that may occur when the variable resistance value of the valve changes because the driver manually operates the variable resistance. According to the mechanical characteristics, there is a disadvantage that the precision of adjustment is lowered because the resistance value does not change constantly.In order to improve this, a high precision variable resistor may be used, but this also acts as a factor that increases the manufacturing cost of the device. There was this.

The present invention was devised to solve the above-described problems, and the valve control signal is automatically controlled by storing the calibration value of the valve control signal in memory linked with the electronic control unit. SUMMARY OF THE INVENTION There is a technical problem to provide a method and system for calibrating a vehicle valve control signal by an electronic control unit which can cause a signal to be calibrated to increase the accuracy of adjustment and the driver's convenience.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of the preferable embodiment of this invention is demonstrated in detail based on an accompanying drawing.

1 is a block diagram of a system for calibrating a vehicle valve control signal by an electronic control unit of the present invention.

The electronic control unit 10 is interlocked with a volatile storage device 20 such as RAM and a nonvolatile storage device 30 such as a flash memory or an EEPROM. Each of the reservoirs 20 and 30 has an electronic control unit ( A drive program for driving 10) is stored. The driving program may be downloaded from the computer 300 connected to the communication unit 40 to the electronic control unit 10 by using a known communication method such as a serial transmission method of RS232C.

In addition, the electronic control unit 10, in order to control the valve opening and closing amount of the valve unit 100 consisting of a proportional control valve (choke valve) or a solenoid valve (solenoid valve), According to the opening / closing amount of the valve, a valve control signal including a pulse signal modulated by a PWM (Pulse Width Modulation) method is output to the PWM driver 50 to have a preset duty ratio.

The PWM driver 50 outputs a valve driving signal, which is a signal having a current value corresponding thereto, according to the input valve control signal, and outputs the valve driving signal to the valve unit 100, and the valve unit 100 is the PWM driver 50. The opening and closing of the valve is performed in proportion to the current value of the valve driving signal applied from the hydraulic generating equipment 200 according to the opening and closing degree of the vehicle to move the movement portion by the opening and closing amount.

In addition, when a current is applied from the PWM driver 50 to the valve unit 100, the current measuring unit 70 measures the current of the valve driving signal to measure a current value used when correcting a valve control signal to be described later. Measure the value.

The current receiver 60 receives a feedback of the valve driving signal applied to the valve unit 100 and inputs it to the electronic control unit 10 in order to measure a current value used when correcting a valve control signal to be described later. The electronic control unit 10 corrects the valve control signal by using the current value of the valve drive signal input from the current receiver 60.

Hereinafter, a method of calibrating a vehicle valve control signal by the electronic control unit of the present invention will be described in detail. 2 is a flowchart of the calibration method of the vehicle valve control signal of the present invention.

First, the electronic control unit 10 generates a valve control signal consisting of a pulse signal modulated in a PWM manner to drive the valve (step S 201), and inputs the generated valve control signal to the PWM driver 50. (Step S202), the PWM driver 50 outputs a valve drive signal having a current value corresponding thereto according to the input valve control signal (step S203).

Subsequently, the current measuring unit 70 measures the current value A of the valve driving signal output from the PWM driver 50 (step S 204), and the valve driving signal in which the current value is measured is the valve unit 100. Is applied.

Next, the electronic control unit 10 reads the predetermined reference current value S stored in the nonvolatile storage device 30 (step S 205), and the valve driving signal measured by the current measuring unit 70. The difference between the current value A and the reference current value S is calculated to determine whether the difference is smaller than a predetermined allowable value (2 mA in the embodiment of the present invention) (step S206).

Here, the difference between the current value A of the valve driving signal measured by the current measuring unit 70 and the reference current value S is calculated, and the reason for comparing the difference with a predetermined allowable value is an error smaller than the allowable value. The purpose is to find the valve control signals and to generate the data necessary for calibration.

If the difference is larger than the allowable value, the valve portion 100 is operated without correcting the valve control signal (step S207). However, if the difference is smaller than the allowable value, the valve control signal is corrected.

The method of calibration of the valve control signal is as follows. That is, the valve to which the electronic control unit 10 is applied to the valve unit 100 in order for the electronic control unit 10 to generate data (hereinafter, referred to as “calibration data”) necessary for the calibration of the valve control signal. The current value of the drive signal is fed back from the valve unit 100 (step S208), and the current average value VA of the valve drive signal obtained by averaging the current values of the feedback valve drive signal by a predetermined number of times is calculated (step S208). S 209).

Then, the electronic control unit 10 calculates a difference between the reference current value S and the current average value VA of the drive signal (step S 210), and corrects the valve control signal based on the calculated difference value. It is regarded as the calibration data for the storage in the nonvolatile storage device 20 (step S 211). In addition, the electronic control unit 10 calculates the calibration data for each valve by calculating the respective calibration data for the valves installed in each part of the vehicle (step S 212), and the non-volatile calibration data stored for each valve It stores in the reservoir 20 (step S213).

By using the above method, the electronic control unit 10 can quickly correct the valve control signal by referring to the calibration data stored in the nonvolatile storage device 30.

In the calibration method of the vehicle valve control signal by the electronic control unit of the present invention having the above configuration, the calibration data of the valve control signal is stored in the reservoir, and the electronic control unit can calibrate the valve control signal with reference to this data. Therefore, it is possible to correct the valve control signal accurately and quickly.

In addition, since there is no need to calibrate the valve control signal manually using a variable resistor as in the prior art, the chattering that may occur when the variable resistance value changes is eliminated at the source. There is an effect that can be made.

Claims (3)

In a system for calibrating a vehicle valve control signal by an electronic control unit of a vehicle, Interlocked with the volatile storage device 20 and the nonvolatile storage device 30, a drive program for driving the electronic control unit 10 is stored in each of the reservoirs (20, 30), the drive program is a communication unit ( 40 can be downloaded from the computer 300 connected to the electronic control unit 10, and in order to control the valve opening and closing amount of the valve unit 100, which is made up of a proportional control valve. An electronic control unit unit 10 for outputting a valve control signal comprising a pulse signal modulated by a pulse width modulation (PWM) method to have a set duty ratio; And The PWM control unit outputs a valve driving signal which is a signal having a current value corresponding to the valve control signal inputted by the electronic control unit unit 10 and the valve control signal inputted thereto ( 50); And A valve unit 100 configured to open and close a valve in proportion to a current value of a valve driving signal applied from the PWM driver 50 to start the hydraulic generator 200 according to the opening and closing degree thereof; And A current measuring unit 70 measuring a current value of a valve control signal when a current is applied from the PWM driver 50 to the valve unit 100; and A current receiver 60 which receives a valve driving signal applied to the valve unit 100 and inputs it to the electronic control unit 10; It is configured to include, The electronic control unit 10 calculates a difference between the reference current value from the current measured by the current measuring unit 70, and if the difference is smaller than an allowable value, the current of the valve driving signal fed back from the current receiving unit 60. Calculating an average value of the values, calculating a difference between the calculated average value and the reference current value, and storing the difference value in the nonvolatile storage element as calibration data for calibrating the valve control signal. Vehicle valve control signal calibration system. In the calibration method of the vehicle valve control signal by the electronic control unit of the vehicle, Generating, by the electronic control unit, a valve control signal consisting of a pulse signal modulated in a PWM manner to drive the valve (step S 201); And Outputting, by the electronic control unit, the generated valve control signal to a PWM driver (step S202); And Outputting a valve driving signal having a current value corresponding to the PWM control unit according to the input valve control signal (step S203); And Measuring a current value A of the valve drive signal output from the PWM driver (step S 204); And Reading a predetermined reference current value S stored in a reservoir linked to the electronic control unit (step S 205); And Calculating, by the electronic control unit, a difference between the current value A of the valve drive signal and the reference current value S, and determining whether the difference is smaller than a preset allowable value (step S 206); And When the difference between the current value A of the valve drive signal and the reference current value S is greater than an allowable value, opening and closing the valve according to the valve drive signal (step S 207); and When the difference between the current value A of the valve drive signal and the reference current value S is smaller than an allowable value, the electronic control unit receiving a feedback value of the valve drive signal from the valve to the valve (step S 208); And Calculating a current average value (VA) of the valve drive signal by averaging the current values of the valve drive signal fed back by the electronic control unit by a predetermined number of times (step S 209); And Calculating, by the electronic control unit, a difference between the reference current value S and a current average value VA of the drive signal (step S 210); And Considering the calculated difference value as calibration data for calibrating the valve control signal and storing the calculated difference value in an associated reservoir (step S 211); Method of calibrating the vehicle valve control signal by the electronic control unit comprising a. The method of claim 2, The electronic control unit calculates the calibration data for each valve by calculating the respective calibration data for the valves installed in each part of the vehicle (step S 212), and stores the calibration data stored for each valve in the associated reservoir Step (step S213); Method of calibrating the vehicle valve control signal by the electronic control unit, characterized in that it further comprises.

Images