KR20040096050A - The temperature monitering method and apparatus of HECU for vehicle - Google Patents

Abstract

PURPOSE: A temperature detection device of a hydraulic electronic control unit for a vehicle and a method thereof are provided to measure the temperature of a solenoid coil and to estimate the temperature of the hydraulic electronic control unit via the use of the measured temperature of the solenoid coil. CONSTITUTION: A temperature detection device of a hydraulic electronic control unit for a vehicle comprises a detection member for detecting the voltage divided by a solenoid coil(L); a preventing member for preventing a direct current from coming to the working power side(Vcc) when the solenoid coil is operated; and a control part(20) measuring the temperature by resistance variation of the solenoid coil according to a voltage signal output from the detection member and estimating the temperature of the hydraulic electronic control unit via the use of the measured temperature of the solenoid coil.

Description

Temperature detection device of vehicle electrohydraulic control device and its method {The temperature monitering method and apparatus of HECU for vehicle}

The present invention relates to a vehicle electromagnetic hydraulic control unit (HECU), and in particular, by measuring the temperature of the solenoid coil configured inside the electromagnetic hydraulic control unit, by using the temperature of the measured solenoid coil to determine the temperature of the electromagnetic hydraulic control unit A method and apparatus for estimating the same.

In general, a vehicle is equipped with a wheel brake for braking the front and rear wheels for the purpose of deceleration or stopping while driving, and a booster and a master cylinder for forming braking hydraulic pressure and transmitting it to the wheel brake side. The hydraulic pressure generated at is transferred to the wheel brake to generate a braking force. However, when the driver presses the brake pedal to control the braking force increase / hold state, if the braking pressure is greater than the road surface state, or if the frictional force of the wheel brake generated by the braking pressure is greater than the braking force generated from the tire or the road surface, the tire is Slipping occurs at the

Therefore, in recent years, to effectively prevent the slip phenomenon to exhibit a strong and stable braking force and to facilitate the operation, the anti-lock brake system (ABS) to prevent the slip of the wheel during braking, Brake Traction Control System (BTCS), which prevents excessive slippage of the drive wheel during sudden start or acceleration, and when the vehicle is not adjusted to the driver's will by external force during high speed driving of the vehicle. A brake hydraulic pressure control system with a vehicle dynamic control system (VDC) has been developed to maintain a stable driving state by controlling brake hydraulic pressure by combining an anti-lock brake system and traction control.

The vehicle brake hydraulic pressure control system controls a hydraulic control unit equipped with a plurality of solenoid valves, low pressure accumulators and high pressure accumulators, and the like to control braking hydraulic pressure delivered to the wheel brake side. An electronic control unit (ECU) is provided, and the hydraulic control unit (HCU) and the electronic control unit (ECU) are compacted into one block, which is called an electromagnetic hydraulic control unit (HECU).

The solenoid valve is divided into a NO type solenoid valve disposed on an upstream side of the wheel brake and an NC type solenoid valve disposed on a downstream side and controlled by an electronic controller. That is, the electronic controller detects the vehicle speed through each wheel sensor disposed at the front wheel and the rear wheel, thereby controlling the opening and closing operation of each solenoid valve. The low pressure accumulator is independently provided on the downstream side of the NC type solenoid valve so that the oil escaping from the wheel brake side is temporarily stored in the decompression mode, and the high pressure accumulator is a type of damping chamber, which is arranged in series with the discharge side of the pump described later. .

In addition, the hydraulic control unit (HCU) includes a solenoid valve, a medium pressure accumulator in which brake fluid is accumulated in addition to the low pressure and high pressure accumulator, a motor, a pump for forcibly pumping oil stored in the low pressure accumulator, and a brake hydraulic pressure discharged from the pump. A flow path for bypassing the pump suction side is provided. Since the medium pressure accumulator is disposed in the bypass flow path, the brake fluid discharged from the pump is accumulated and supplied to the pump side during the vehicle attitude control operation.

On the other hand, the master cylinder is disposed a pressure sensor for detecting the hydraulic pressure generated by the brake pedal pedal force of the driver delivered to the hydraulic block side, and transmits it as an electrical signal to the electronic control device. Accordingly, the electronic controller controls the additional operation of the pump and the opening / closing operation of each NC / NO solenoid valve based on the signal transmitted from the pressure sensor.

In the ABS, TCS, ESP system that performs the braking operation by the configuration described above, the electronic hydraulic control device is responsible for the most important braking control when an emergency situation occurs during the driving of the vehicle, so that the braking system can be controlled more accurately under various driving conditions. It is essential to monitor the various states of the electrohydraulic control system. In particular, in the case of proportional control valve control (LFC) and motor speed control (MSC), which are applied to perform sophisticated braking control, the temperature of the hydraulic control unit has a great influence on the control performance. Information on the electronic control unit should be provided.

However, the conventional electrohydraulic controller does not have a means for measuring temperature, so the temperature of the electrohydraulic controller cannot be measured, and the electrohydraulic controller is equipped with a temperature sensor to measure the temperature. Accurate temperature is measurable, but there is a problem in that the manufacturing cost increases due to the attachment of the temperature sensor and the design of the electronic hydraulic control device needs to be changed.

In view of the above problems, in the present invention, a method and apparatus for measuring the temperature of a solenoid coil configured in an electromagnetic hydraulic control device and estimating the temperature of the electromagnetic hydraulic control device using the measured temperature of the solenoid coil The purpose is to provide.

1 is a hydraulic circuit diagram showing a general brake hydraulic pressure control system for a vehicle.

Figure 2 is a block diagram showing an apparatus for estimating the temperature of the electrohydraulic brake system of the present invention.

Figure 3 is a graph for showing the temperature change characteristics with time of the solenoid coil and the electro-hydraulic brake system.

Figure 4 is a flow chart showing a method for estimating the temperature of the electrohydraulic brake system of the present invention.

* Description of the symbols for the main parts of the drawings *

10: brake pedal 20: control unit

30: motor 40: hydraulic control unit (HCU)

50: electronic control unit (ECU) 100: electronic hydraulic control unit (HECU)

The present invention for achieving the above object,

An electrohydraulic control device comprising a hydraulic control device having a plurality of solenoid valves, a pump, and the like, and an electronic control device for electrically controlling the driving of the solenoid valve, the pump, and the like, for controlling the operation of the solenoid valve. Measuring the temperature of the solenoid coil, characterized in that the step of estimating the temperature of the electromagnetic hydraulic control device using the measured temperature of the solenoid coil.

The estimating of the temperature of the electrohydraulic control device may be estimated using the temperature of the solenoid coil measured in the first time and the temperature of the solenoid coil measured in the second time.

The estimating method in the step of estimating the temperature of the electromagnetic hydraulic control device is characterized by being achieved by a predetermined equation.

In addition, the electro-hydraulic control device of the present invention in the device for monitoring the amount of change in the voltage in the solenoid coil by applying a predetermined DC power to the solenoid coil in the solenoid valve for adjusting the brake hydraulic pressure supplied to the wheel cylinder of the vehicle Detecting means for detecting a voltage divided by the solenoid coil;

Preventing means for preventing operating power from flowing into the DC power supply when the solenoid coil is operated, and measuring the temperature according to the resistance change amount of the solenoid coil in accordance with the voltage signal output from the detecting means, the measured solenoid coil It characterized in that it comprises a control unit for estimating the temperature of the electromagnetic hydraulic control device using the temperature of.

The control unit inputs the voltage signal output from the detection means to measure the temperature of the solenoid coil, the solenoid coil temperature measuring unit, using the temperature data measured by the solenoid coil temperature measuring unit for estimating the temperature of the electromagnetic hydraulic control device It consists of a temperature estimator.

The temperature measuring unit is characterized in that to estimate the temperature of the electromagnetic hydraulic control device using a predetermined equation.

Hereinafter, with reference to the accompanying drawings illustrating a detailed configuration and operation of the present invention for a preferred embodiment according to the present invention.

1 is a hydraulic circuit diagram showing a general brake hydraulic pressure control system for a vehicle, Figure 2 is a block diagram showing a device for estimating the temperature of the electrohydraulic brake system of the present invention, Figure 3 is a time of the solenoid coil and the electro-hydraulic brake system 4 is a flow chart showing a method for estimating the temperature of the electrohydraulic brake system of the present invention.

First, the configuration thereof will be briefly described with reference to FIGS. 1 and 2 as follows.

As shown in the hydraulic circuit diagram shown in FIG. 1, a hydraulic control unit (HCU) 40 having a solenoid valve (not shown) and a pump (not shown) and the like, and driving of the solenoid valve and the pump, etc. An electro-hydraulic control unit (HECU) 100 composed of an electronic control unit 50 (ECU) having a built-in circuit board 52 for electrically controlling, a front wheel FR and a rear wheel RR of the vehicle ( The wheel sensor 15 is disposed on the RL and senses the wheel speed to transmit an electrical signal to the electronic controller 50.

In addition, one side of the hydraulic control unit (HCU) 40 is configured with a motor 30 for driving a pump embedded in the hydraulic control unit (40). Reference numeral 10 denotes a brake pedal, 11 a power booster, 12 a master cylinder, and 13 a reservoir.

In addition, the apparatus for detecting the temperature of the solenoid coil (L) in the hydraulic control device 40, as configured in Figure 2 includes a shunt resistor (Rs) for detecting the voltage divided by the solenoid coil (L), The multiplier 70 for amplifying the divided resistance value detected by the shunt resistor Rs at a predetermined magnification and outputting it to the control unit 20, and the battery power supply to the operation power supply Vcc side when the solenoid coil L is operated. Measuring the temperature according to the resistance change amount of the solenoid coil (L) according to the switching means (Q1), the voltage signal (Vs) output from the shunt resistor (Rs) for preventing the (BAT) from flowing in, and the measurement The controller 20 estimates the temperature of the electromagnetic hydraulic control apparatus 100 using the temperature of the solenoid coil L, and the battery power BAT is controlled by the control signal of the controller 20. Consisting of switching means Q2 for supplying The.

The controller 20 is a solenoid coil temperature measuring unit 21 for measuring the temperature of the solenoid coil (L) by inputting the voltage signal (Vs) output by the shunt resistor (Rs), the solenoid coil temperature measuring unit ( And a temperature estimating unit 22 for estimating the temperature of the HECU 100 using the temperature data measured at 21.

Looking at the control process with reference to FIG.

The controller 20 first determines whether the hydraulic braking system is in operation and measures the first temperature of the solenoid coil L if the braking operation is not performed. After that, if it is determined whether the set time is required, the second temperature of the solenoid coil L is measured again, and the temperature of the electromagnetic hydraulic brake apparatus 100 is estimated using the first temperature and the second temperature.

The detailed operation is as follows.

As shown in FIG. 3, the solenoid valve is frequently operated while the braking system is operating, and the temperature of the solenoid coil L also changes rapidly. At this time, the electrohydraulic control device 100 initially changes in temperature, but the temperature gradually changes from a certain point. The braking system operates at a time when the temperature of the electrohydraulic control device 100 needs to be known. It is time to start this operation. That is, since it is most important to grasp the temperature of the electronic hydraulic control apparatus 100 for the external environment and to perform control corresponding to the determined temperature condition, the electronic hydraulic control apparatus 100 periodically when the system does not operate. The temperature is monitored and the temperature change rate is low, as shown in the graph of FIG. 3 while the system is operating.

Typically, the solenoid valve includes a solenoid coil (L), when a current flows in the solenoid coil, a magnetic force is generated to operate the plunger in the valve to change the opening degree of the valve.

As a reference for knowing the operation time of the solenoid coil L, the control unit 20 determines whether the braking system ABS, TCS, ESP is in operation, and if the system is not in operation,

First, the control unit 20 turns off the switching means Q1 so that the operating power Vcc is not supplied to the solenoid coil L, and the switching means Q2 so that the battery power BAT is supplied to the solenoid coil L. FIG. Turn on.

Then, the voltage by the battery power source BAT is supplied to the solenoid coil L side, and the control unit 10 detects the voltage Vs between both ends of the shunt resistor Rs to know the current flowing through the solenoid coil L. do. The controller 20 knows the current flowing through the solenoid coil L by the voltage Vs between both ends, and recognizes the resistance change according to the temperature change of the solenoid coil L through the current. At this time, a voltage value divided by the shunt resistor Rs is applied to the voltage of the battery power source BAT. Therefore, according to Ohm's law (V = IR), a voltage proportional to the temperature change of the solenoid coil L is generated across the shunt resistor Rs, and the controller 20 controls the shunt resistor Rs. Both ends of the voltage (Vs) signal is received.

For example, when the battery power source (BAT) is 12V, the shunt resistor (Rs) is 15Ω, the resistance of the solenoid coil (L) (5Ω), according to the voltage distribution law, a 9V voltage is applied across the shunt resistor (Rs), 3V is applied across the solenoid coil (L). When the temperature of the solenoid coil (L) changes and the resistance of the solenoid coil (L) changes from 5Ω to 10Ω, the shunt resistor (Rs) has a voltage of 7.2V and 4.8V across the solenoid coil (L). Accordingly, since the controller 20 knows the voltage Vs across the shunt resistor Rs, the solenoid coil temperature measuring unit 21 of the controller 20 inputs the voltage across the shunt resistor Rs. The temperature of the solenoid coil (L) is measured, and after the predetermined time, the same process is performed again to secure the first temperature and the second temperature data.

The temperature estimation unit 22 of the controller 20 inputs the obtained temperature data of the solenoid coil L to estimate the temperature of the electromagnetic hydraulic control device (HECU) 100. The temperature is estimated.

First, after a predetermined time t, the temperature of the solenoid coil L is calculated using the following equation.

[Equation 1]

T (t) = T _i + (T _h -T _i ) × (1-e ^-Bt )

(Where T (t) is the solenoid coil temperature, T _i is the initial temperature of the solenoid coil, T _h is the temperature of the electrohydraulic controller, B is the coil constant, e is the natural logarithmic exponent, and t is the time).

At one time t1, the solenoid coil temperature T1 and at another time t2, the solenoid coil temperature T2 is obtained and substituted into Equation 1 above, to the electrohydraulic controller temperature T _h . If you summarize, you can arrange like the following equation.

[Equation 2]

(Where T ₁ and T ₂ are solenoid coil temperatures, T _i is the initial temperature of the solenoid coil, T _h is the temperature of the electrohydraulic controller, B is the coil constant, e is the natural logarithmic exponent, and t is the time).

The temperature estimator 22 of the controller 20 estimates the temperature of the HECU 100 by using Equation 2 above.

In the present invention as described above, by measuring the temperature of the solenoid coil in the electro-hydraulic control device, and using the measured temperature of the solenoid coil to estimate the temperature of the electro-hydraulic control device, the hydraulic control system, that is, ABS, TCS, By providing temperature information of the electro-hydraulic device, which is important for control during the operation of the ESP system, etc., the reliability of the hydraulic control system can be secured, and a safer braking system can be provided to the user.

Claims (7)

In a hydraulic control system having a hydraulic control device with a plurality of solenoid valves, pumps, etc., and an electronic hydraulic control device comprising an electronic control device for electrically controlling the driving of the solenoid valves and pumps, Measuring a temperature of the solenoid coil controlling the driving of the solenoid valve, And estimating the temperature of the electromagnetic hydraulic control device using the measured temperature of the solenoid coil. The method of claim 1, The step of estimating the temperature of the electrohydraulic control device is performed by using the temperature of the solenoid coil measured in the first time and the temperature of the solenoid coil measured in the second time. Way. The method according to claim 1 or 2, And estimating the temperature in the step of estimating the temperature of the electromagnetic hydraulic control device. The method of measuring the temperature of the electromagnetic hydraulic control device for a vehicle according to the following equation. [Equation] Where T ₁ and T ₂ are the solenoid coil temperatures, T _i is the initial temperature of the solenoid coil, T _h is the temperature of the electrohydraulic controller, B is the coil constant, e is the Napier's number, and t is the time. .) In the hydraulic control system provided with an electro-hydraulic control device for adjusting the brake hydraulic pressure supplied to the wheel cylinder of the vehicle by applying a predetermined operating power to the solenoid coil in the plurality of solenoid valve, A detecting member for detecting a voltage divided by the solenoid coil, Preventing member for preventing the DC power flowing into the operating power side when the solenoid coil is operated, And a controller for measuring a temperature according to a resistance change amount of the solenoid coil according to the voltage signal output from the detection member, and estimating a temperature of the electromagnetic hydraulic control apparatus using the measured temperature of the solenoid coil. Temperature measuring device of the electromagnetic hydraulic control device for a vehicle. The method of claim 4, wherein And amplifying member for amplifying the divided resistance value detected by the detecting member at a predetermined set magnification and outputting the same to the controller. The method of claim 4, wherein The control unit inputs the divided voltage signal output from the detection member to estimate the temperature of the solenoid coil, and estimates the temperature of the electromagnetic hydraulic control device using the temperature data measured by the solenoid coil temperature measuring unit. Temperature measuring device of the electronic hydraulic control device for a vehicle, characterized in that consisting of a temperature estimating unit. The method of claim 4, wherein The temperature measuring unit temperature measuring device of the electronic hydraulic control apparatus for a vehicle, characterized in that for estimating the temperature of the electronic hydraulic control apparatus using the following equation. [Equation] Where T ₁ and T ₂ are the solenoid coil temperatures, T _i is the initial temperature of the solenoid coil, T _h is the temperature of the electrohydraulic controller, B is the coil constant, e is the Napier's number, and t is the time. .)