KR20160015977A - Apparatus and method for monitoring temperature chance of valve coil in vehicle - Google Patents

Apparatus and method for monitoring temperature chance of valve coil in vehicle Download PDF

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KR20160015977A
KR20160015977A KR1020140099039A KR20140099039A KR20160015977A KR 20160015977 A KR20160015977 A KR 20160015977A KR 1020140099039 A KR1020140099039 A KR 1020140099039A KR 20140099039 A KR20140099039 A KR 20140099039A KR 20160015977 A KR20160015977 A KR 20160015977A
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South Korea
Prior art keywords
valve coil
valve
mos transistor
node
ecu
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KR1020140099039A
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Korean (ko)
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한종규
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현대모비스 주식회사
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Priority to KR1020140099039A priority Critical patent/KR20160015977A/en
Publication of KR20160015977A publication Critical patent/KR20160015977A/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/66—Electrical control in fluid-pressure brake systems
    • B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
    • B60T13/686—Electrical control in fluid-pressure brake systems by electrically-controlled valves in hydraulic systems or parts thereof
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/221—Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T8/00—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force
    • B60T8/32—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration
    • B60T8/34—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition
    • B60T8/36—Arrangements for adjusting wheel-braking force to meet varying vehicular or ground-surface conditions, e.g. limiting or varying distribution of braking force responsive to a speed condition, e.g. acceleration or deceleration having a fluid pressure regulator responsive to a speed condition including a pilot valve responding to an electromagnetic force
    • B60T8/3615—Electromagnetic valves specially adapted for anti-lock brake and traction control systems
    • B60T8/363—Electromagnetic valves specially adapted for anti-lock brake and traction control systems in hydraulic systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid

Abstract

Disclosed are an apparatus and a method for monitoring temperature change of a valve coil for a vehicle. The apparatus comprises: a first metal-oxide-semiconductor (MOS) transistor which is connected between a battery power source and a valve coil of a solenoid valve, and applies battery power to the valve coil in response to a failure diagnosis signal; a second MOS transistor which is connected between the valve coil and a grounding power source, and connects the valve coil and the grounding power source in response to a valve activation signal; a measuring capacitor which is connected among the first MOS transistor, a first node of the valve coil, and the grounding power source, and charges and discharges an electric charge; and an electronic control unit (ECU) which controls the first MOS transistor and the second MOS transistor by outputting the failure diagnosis signal and the valve activation signal, and monitors temperature of the valve coil by detecting a voltage level of the first node which drops depending on the discharge of the measuring capacitor.

Description

TECHNICAL FIELD [0001] The present invention relates to an apparatus and a method for monitoring a temperature change of a valve coil of a vehicle,

The present invention relates to a temperature change monitoring circuit and method for a vehicular valve coil, and more particularly, to a temperature change monitoring circuit and method for a vehicular valve coil that measures a temperature change using charge and discharge of a capacitor.

Electronic Stability Control (ESC) controls the ABS (Anti-lock Brake System) as well as engine torque to generate braking force using hydraulic pressure to prevent the vehicle from deviating from the driving direction on slippery road surface, (Electronic Parking Brake) is an electronically controlled parking brake system. It refers to a system that generates parking braking force according to the state of the EPB switch and vehicle (stop or drive).

In an existing vehicle, an ECU (Electronic Control Unit) for controlling the ESC and an ECU for controlling the EPB are separately provided. However, ECUs that can control ESC and EPB have recently been developed and applied to vehicles.

With the development of an ECU that can integrate ESC and EPB, it is possible to achieve the reduction of the number of electric parts, the simplification of design, the cost reduction and the lighter weight of the vehicle, Can be controlled more efficiently.

On the other hand, the ESC uses a solenoid valve for on / off of hydraulic transmission to actuate the brakes. The solenoid valve is opened and closed in response to the signal transmitted from the ECU to generate the braking force required by the ESC. The solenoid valve is driven by applying a current to the valve coil. However, the valve coil applied to the ESC and EPB integrated control ECU has a resistance value increase of 0.39% based on the nominal resistance value every time the temperature rises by 1 ° C. This causes a resistance value difference of about 1.8 times in the maximum temperature range (for example, 115 DEG C) at the operation minimum temperature of the ECU (for example, -40 DEG C). The difference in the resistance value of the valve coil depending on the above temperature causes a change in the amount of current flowing through the valve coil so that the solenoid valve can not transmit the hydraulic pressure corresponding to the control of the ECU. This is a braking performance problem of a vehicle braking device beyond merely a problem of lowering the reliability of the solenoid valve, and can be a factor that threatens the safety of the vehicle occupant. Therefore, the ECU must be able to monitor and compensate the temperature of the valve coil in order to accurately control the solenoid valve.

In order to prevent deterioration of solenoid valve performance due to temperature, a device for determining the temperature of the valve coil by measuring the resistance value of the valve coil has been proposed.

Fig. 1 shows a circuit configuration of a conventional valve coil resistance value measuring apparatus.

1, the valve coil VC is connected between the battery BATT and the ground power source Vss in series with the first MOS transistor M1 and the second MOS transistor M2. The first MOS transistor M1 is connected between the battery BATT and the first node ND1 and is turned on / off in response to the failure diagnostic signal FS applied by the ECU to supply the voltage of the battery BATT to the valve coil (VC). The second MOS transistor M2 is connected between the valve coil VC and the ground power supply Vss and is turned on and off in response to the valve activation signal VS applied by the ECU to activate or deactivate the valve coil VC Deactivate.

The dotted line region is a valve inspection circuit (VCR) which is connected between the power supply voltage Vcc and the first node ND1 and supplies a current from the power supply voltage Vcc to the valve coil VC in response to the inspection signal CS Thereby forming a current path. A constant voltage of 5 V is generally used for the power supply voltage Vcc.

The fifth and sixth resistors R5 and R6 connected in parallel with the valve coil VC between the first node ND1 and the ground power supply Vss are voltage distribution resistors, And outputs the valve monitoring signal VM. That is, the voltage value for discriminating the resistance value of the valve coil VC, as the valve monitoring signal VM. The ECU receives the valve monitoring signal VM and measures the voltage value, thereby discriminating the resistance value of the valve coil VC and calculating the temperature of the valve coil VC based on the determined resistance value.

The method for measuring the resistance value of the valve coil in Fig. 1 is such that the ECU first disconnects the fault diagnosis signal FS applied to the first MOS transistor M1, 2 MOS transistor M2 to turn off the MOS transistor M1 and turn on the second MOS transistor M2. The first MOS transistor M1 is turned off and the voltage of the battery BATT is not applied to the valve coil VC while the second MOS transistor M2 is turned on so that the valve coil VC is connected to the ground power source Vss By being connected, it is activated.

On the other hand, the ECU applies the inspection signal CS to the valve inspection circuit (VCR), and the second bipolar transistor Q2 of the valve inspection circuit (VCR) to which the inspection signal CS is applied is supplied with the third and fourth resistors R3 , And R4 cause the voltage difference between the base-emitter to become 0.7V, resulting in a saturation state. Then, the voltage difference between the first bipolar transistor Q1 and the base-emitter becomes 0.7 V by the first, second and seventh resistors R1, R2 and R7, and becomes saturated.

A current path through the seventh resistor R7, the first bipolar transistor Q1, the diode D1, the valve coil VC, and the second MOS transistor M2 is sequentially formed from the power supply voltage Vcc. Therefore, the current flowing through the valve coil VC can be calculated as shown in Equation (1).

Figure pat00001

(Where I VC represents the current flowing through the valve coil VC and V CEQ1 and V D1 represent the voltage drop between the collector and emitter of the first bipolar transistor Q1 and the voltage drop across the diode D1, And R 7 and R VC represent the resistance values of the seventh resistor R7 and the valve coil VC respectively and R DSM2 represents the resistance value between the drain and the source when the second MOS transistor M2 is on .)

The relationship between the resistance value of the valve coil VC and the valve monitoring signal VM generated by distributing the voltage applied to the first node ND1 to measure the resistance value of the valve coil VC is expressed by Equation 2 .

Figure pat00002

(Wherein, R 5 and R 6 represents a voltage value of the fifth and sixth resistors (R5, R6) represents a resistance value VM is valve V monitoring signal (VM) respectively.)

As a result, the resistance value of the valve coil can be monitored from the voltage value V VM of the valve monitoring signal VM.

On the other hand, the seventh resistor R7 provided in the valve inspection circuit (VCR) for limiting the current flowing through the valve coil VC typically has a resistance value of 50 OMEGA while the display resistance value of the valve coil VC is 5.4 Lt; / RTI > That is, the resistance value of the seventh resistor R7 is relatively larger than the resistance value of the valve coil VC. Also, in the valve coil resistance value measuring circuit shown in Fig. 1, the voltage value (V VM ) of the valve monitoring signal VM is a voltage-divided signal by the fifth and sixth resistors R5 and R6. Therefore, the voltage value (V VM ) of the actually monitored valve monitoring signal (VM) can not accurately measure the resistance value (R VC ) of the valve coil (VC) because the amount of change is insignificant even when the resistance value of the valve coil There is a limit to being very vulnerable.

Table 1 is a table showing the resistance value (R VC ) of the valve coil (VC) and the voltage value (V VM ) of the valve monitoring signal (VM).

Temperature (℃) The resistance value of the valve coil (Ω) The voltage value (V) of the valve monitoring signal -40 4.0732 0.0079 25 5.4 0.1000 115 7.3375 0.1310

According to Table 1, the difference that the AD converter of the ECU can detect according to the voltage value (V VM ) of the valve monitoring signal (VM) is the temperature change level of 6.6 ° C. In this case, if 100 mV of noise is generated, -40 ° C is mistaken to 25 ° C. This is not a reliable device because the range of error is too large.

Korean Patent No. 10-0760862 entitled " Device for Monitoring Temperature Change of Solenoid Coil "discloses a technique for reducing the heat generation amount of a shunt resistor for detecting a change in temperature of a solenoid coil. Basically, Circuit does not solve the problem that it is difficult to accurately measure the resistance value R VC of the valve coil VC.

It is an object of the present invention to provide an apparatus for monitoring a temperature change of a valve coil of a vehicle which can accurately measure the resistance value of a battery coil using a capacitor discharge time charged with a battery charge.

It is another object of the present invention to provide a method for monitoring a temperature change of a valve coil of a vehicle.

According to an aspect of the present invention, there is provided an apparatus for monitoring a temperature change of a valve coil for a vehicle, the apparatus being connected between a battery power source and a valve coil of a solenoid valve, A first MOS transistor to which the first MOS transistor is applied; A second MOS transistor connected between the valve coil and a ground power supply and responsive to a valve activation signal, for connecting the valve coil to the ground power supply; A measuring capacitor connected between the first node between the first MOS transistor and the valve coil and the ground power supply in parallel with the valve coil to charge and discharge the charge; And a controller for controlling the first MOS transistor and the second MOS transistor by outputting the fault diagnosis signal and the valve activation signal to sense a time when the voltage level of the first node drops in accordance with a discharge of the measurement capacitor, An ECU for monitoring the temperature of the valve coil; .

The ECU turns off the first MOS transistor and turns on the second MOS transistor when the first MOS transistor is turned on to charge the measurement capacitor and the temperature of the valve coil is monitored, And charges charged in the capacitor are discharged.

The apparatus for monitoring a temperature change of a vehicle valve coil further includes two distribution resistors connected in parallel with the valve coil and the measurement capacitor between the first node and the ground power supply to distribute a voltage of the first node, The ECU receives a valve monitoring signal induced at a second node between the two distribution resistors and detects a drop in the voltage level of the first node.

The ECU measures the time from when the measuring capacitor starts to discharge until the voltage level of the valve monitoring signal drops below a predetermined reference voltage and calculates the resistance value of the valve coil from the measured time And calculating the temperature of the valve coil from the obtained resistance value of the valve coil.

According to an aspect of the present invention, there is provided a method for monitoring a temperature change of a valve coil for a vehicle, the method comprising: sensing a temperature of the valve coil of the vehicle, including a first MOS transistor, a second MOS transistor, A method for monitoring a temperature change of a coil, the method comprising: outputting a fault diagnosis signal to the first MOS transistor connected between a battery power source and a valve coil of a solenoid valve to turn off the valve; Outputting a valve activation signal to the second MOS transistor to turn on and enter a monitoring mode; When the ECU discharges the charged charge through the first node between the first node between the first MOS transistor and the valve coil and the ground power source and the measuring capacitor connected in parallel with the valve coil, Determining whether a voltage level of one node falls below a predetermined reference voltage; Calculating a temperature of the valve coil using a time measured until the voltage level of the first node drops below the predetermined reference voltage after the ECU enters the monitoring mode; .

Wherein the step of discriminating whether or not the temperature of the vehicle valve coils drops below the reference voltage is performed by controlling the temperature change monitoring apparatus of the vehicular valve coil to be in parallel with the valve coil and the measuring capacitor between the first node and the grounding power supply, Wherein the ECU receives a valve monitoring signal induced at a second node between the two distribution resistors to sense a drop in the voltage level of the first node.

Wherein the step of calculating the temperature of the valve coil is characterized by calculating the resistance value of the valve coil from the measured time and calculating the temperature of the valve coil using the obtained resistance value of the valve coil .

The method for monitoring temperature change of a vehicular valve coil may include diagnosing whether the valve coil fails before entering the monitoring mode. And charging the measuring capacitor by the ECU turning on the first MOS transistor and turning off the second MOS transistor; And further comprising:

The diagnosis of the failure of the valve coil may include detecting the voltage level of the first node after the ECU turns on the second MOS transistor while the first MOS transistor is turned off, ; And after the ECU turns on the first MOS transistor, sensing a voltage level of the first node to determine a short-circuit of the valve coil; And a control unit.

Therefore, the apparatus and method for monitoring the temperature change of the valve coil for a vehicle according to the present invention monitor the temperature change of the valve coil by measuring the time during which charges charged in the capacitor connected in parallel with the valve coil are discharged, A circuit is not required, manufacturing cost can be reduced, and miniaturization can be achieved. Especially, it can monitor temperature change of valve coil more than 6 times more than conventional valve coil temperature change monitoring device.

Fig. 1 shows a circuit configuration of a conventional valve coil resistance value measuring apparatus.
2 shows a circuit configuration of an apparatus for monitoring the temperature change of a vehicular valve coil according to an embodiment of the present invention.
Figs. 3 and 4 show operation states of the temperature change monitoring apparatus of the vehicular valve coil of Fig. 2. Fig.
5 shows a circuit configuration of an apparatus for monitoring the temperature change of a vehicular valve coil according to an embodiment of the present invention.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. However, the present invention can be implemented in various different forms, and is not limited to the embodiments described. In order to clearly describe the present invention, parts that are not related to the description are omitted, and the same reference numerals in the drawings denote the same members.

Throughout the specification, when an element is referred to as "including" an element, it does not exclude other elements unless specifically stated to the contrary. The terms "part", "unit", "module", "block", and the like described in the specification mean units for processing at least one function or operation, And a combination of software.

2 shows a circuit configuration of an apparatus for monitoring the temperature change of a vehicular valve coil according to an embodiment of the present invention.

2, the apparatus for monitoring temperature change of a vehicular valve coil includes a first MOS transistor M1, a valve coil VC, and a second MOS transistor (not shown) between a battery power source BATT and a ground power source Vss M2 are connected in series. The first MOS transistor M1 connected between the battery power source BATT and the valve coil VC is turned on and off in response to the failure diagnostic signal FS applied by the ECU to apply the voltage of the battery BATT to the valve coil VC). That is, the first MOS transistor M1 is turned on when the failure diagnosis signal FS is inactivated and operates as a power switch for supplying power to the battery valve VC.

The second MOS transistor M2 connected between the valve coil VC and the ground power supply Vss is turned on and off by receiving the valve activation signal VS from the ECU so that the valve coil VC and the ground power supply Vss ), Thereby activating the valve coil VC.

The measuring capacitor C1 is connected in parallel with the valve coil VC between the first node ND1 between the first MOS transistor M1 and the valve coil VC and the ground power source Vss. When the first MOS transistor M1 is turned on in response to the failure diagnosis signal FS, the measuring capacitor C1 charges the battery BATT with the battery voltage BATT. On the other hand, when the first MOS transistor M1 is turned off, the charged charge is discharged.

On the other hand, the first resistor R1 and the second resistor R2, which are connected in series with each other between the first node ND1 and the ground power supply Vss in parallel with the valve coil VC and the measuring capacitor C1, And distributes the voltage applied to the valve coil VC to induce the valve monitoring signal VM at the second node ND2 between the first resistor R1 and the second resistor R2. The valve monitoring signal VM is applied to the ECU monitoring the temperature change of the valve coil VC. The two distribution resistors R1 and R2 are resistances provided to control the voltage level of the valve monitoring signal VM applied to the ECU, and the voltage level variation range of the first node ND1 is within a range , The voltage of the first node ND1 may be directly applied to the ECU as the valve monitoring signal VM. In this case, the two distribution resistors R1 and R2 may be omitted.

As shown in FIG. 2, the apparatus for monitoring a temperature change of a vehicular valve coil according to the present invention does not have a complicated valve inspection circuit (VCR) different from that of FIG. 1, but merely additionally includes a measurement capacitor C1, And is configured to monitor the temperature change of the coil.

Figs. 3 and 4 show operation states of the temperature change monitoring apparatus of the vehicular valve coil of Fig. 2. Fig.

FIG. 3 is a view for explaining a process of charging the measuring capacitor C1, and FIG. 4 is a view for explaining the process of discharging the measuring capacitor C1. 3, the operation of the temperature change monitoring apparatus for a vehicle valve coil according to the present invention will be described with reference to FIGS. 3 and 4. First, as shown in FIG. 3, Is applied to the MOS transistor M1, and the valve activation signal VS is applied to the second MOS transistor M2 at the second voltage level. Accordingly, the first MOS transistor M1 is turned on in response to the failure diagnostic signal FS of the first voltage level, and the second MOS transistor M2 is turned off.

As the first MOS transistor M1 is turned on, the battery coil BATT is connected between the first node ND1 and the ground power supply Vss in parallel with the valve coil VC and the measuring capacitor C1, And is applied to two distribution resistors R1 and R2. However, since the second MOS transistor M2 connected to the valve coil VC is turned off, no current flows through the valve coil VC. In addition, the resistance values of the two distribution resistors (R1 and R2) are set at a very high level of several tens of MΩ, so that only minute current flows. At this time, the first MOS transistor M1 is in a triode state and the resistance value R DSM1 between the drain and the source is very small (for example, 3 mΩ or less) at a negligible level.

Therefore, the voltage of the battery power source BATT is applied to the measurement capacitor C1 without any drop, and a large amount of charge is charged in the measurement capacitor C1. The charge amount charged in the measurement capacitor C1 can be calculated as shown in Equation 3. " (3) "

Figure pat00003

(Where Q C1 is the charge amount charged in the measurement capacitor C1 , C C1 is the capacitance of the measurement capacitor C1, and V BATT is the voltage of the battery power source BATT).

Thereafter, when the failure diagnosis signal FS transits to the second voltage level, the first MOS transistor M1 is turned off, and the supply of charge from the battery power source BATT to the measurement capacitor C1 is cut off. Although the supply of the charge to the measuring capacitor C1 is cut off, the second MOS transistor M2 is kept in the turned-off state and the two distribution resistors R1 and R2 are set to have a very high resistance value, The discharge path of the charge charged in the measurement capacitor C1 is not formed. Therefore, the voltage levels of the first node ND1 and the second node ND2 hardly change. That is, the voltage value V VM of the valve monitoring signal VM indicating the voltage level of the second node ND2 does not occur.

Then, as shown in FIG. 4, the valve activation signal VS transitions to the first voltage level and is applied to the second MOS transistor M2. As the valve activation signal VS transitions to the first voltage level, the second MOS transistor M2 is turned on and the charge charged in the measurement capacitor C1 is formed as the discharge path, so that the valve coil VC and the second And is discharged through the MOS transistor M2. And the voltage value V VM of the valve monitoring signal VM decreases as the charge charged in the measuring capacitor Cl is discharged.

At this time, the voltage level applied to the first node ND1 may be calculated by Equation (4) and Equation (5).

Figure pat00004

(Where V ND1 is the voltage at the first node ND1, V BATT is the voltage of the battery power BATT, e is the exponential function, t is the time, and R VC and R M2 is each resistance of the valve coils (VC) and the MOS transistor 2 (M2), C c1 represents the capacitance of the measuring capacitor (c1).)

Figure pat00005

(Wherein, R 1 and R 2 represents the voltage value of the first and second resistors (represents the resistance of R1, R1) V VM is the valve monitoring signal (VM) respectively.)

Equation (4) and Equation (5) can be expressed by Equation (6).

Figure pat00006

When the equation (6) is rearranged with respect to time t, the relationship between the time at which the voltage value V VM of the valve monitoring signal VM decreases according to the resistance value of the valve coil VC is calculated as shown in equation do.

Figure pat00007

If the voltage level of the battery power source V BATT is 12 V, the capacitance of the measuring capacitor C1 is 300 μF and the resistance values of the first and second resistors R 1 and R 2 are respectively 30 MΩ and 10 MΩ, The voltage value V VM of the valve monitoring signal VM is set to the reference voltage Vref in accordance with the resistance value R VC of the valve coil VC when the resistance value R M2 of the transistor M2 is 0.2 V The time (t) required to reach the set 0.1 V is 4.36 ms when the temperature of the valve coil is -40 ° C (the resistance value is 4.0732? Referring to Table 1), and the temperature of the valve coil is -39 ° C (4.0932?), It is 4.381 ms.

That is, as the temperature of the valve coil VC is changed by 1 ° C, the discharge time t has a difference of 20 μS. The time difference of 20μS is enough to be sensed by the ECU, and it is possible to monitor the temperature change of the valve coil (VC) by more than 6 times compared to the previous 6.6 ℃ temperature change.

2 to 4, the ECU is omitted for convenience of explanation. However, as described above, the ECU outputs the failure diagnosis signal FS and the valve activation signal VS, receives the valve monitoring signal VM, The ECU is included in the constituent elements of the present invention.

5 shows a method for monitoring a temperature change of a vehicular valve coil according to an embodiment of the present invention.

Referring to FIGS. 2 to 4, a method of monitoring the temperature change of the vehicular valve coil of FIG. 5 will be described. First, power is applied to the ECU to determine whether the ECU is driven (S110). When the ECU is driven, the ECU applies the valve activation signal VS to the second MOS transistor M2 at the first voltage level to turn on the second MOS transistor M2 (S120). At this time, the first MOS transistor M1 is kept in the turned off state. Then, the ECU determines whether the voltage level of the valve monitoring signal VM is a predetermined low level (S130).

If the voltage level of the valve monitoring signal VM is not at the low level, the ECU determines that the valve coil VC is disconnected (S140). Since it is determined that the valve coil VC is disconnected, the ECU outputs a failure message to another ECU in the vehicle so that the user recognizes that a failure has occurred (S150).

On the other hand, if the voltage level of the valve monitoring signal VM is low, the ECU applies the failure diagnosis signal FS of the first voltage level to the first MOS transistor M1 to turn on the first MOS transistor M1 (S160). Then, the ECU determines whether the voltage level of the valve monitoring signal VM is a predetermined high level (S170).

If the voltage level of the valve monitoring signal VM is not at the high level, the ECU determines that a short circuit occurs in the valve coil VC (S180). Then, the ECU outputs a fault message (S150).

However, if the voltage level of the valve monitoring signal VM is high, it is determined that there is no abnormality in the valve coil VC, and the valve activation signal VS of the second voltage level is applied to the second MOS transistor M2 , And turns off the second MOS transistor M2 (S190). At this time, since the first MOS transistor M1 is kept in the turned-on state, the measurement capacitor C1 is charged.

Thereafter, the ECU determines whether the valve coil enters the temperature change monitoring mode (S200). The ECU may determine whether or not the monitoring mode is entered at a predetermined time period, and may determine whether or not a monitoring entry command is applied from another ECU in the vehicle.

If it is determined that the mode is entered, the ECU applies the second level fault diagnostic signal FS to the first MOS transistor M1 to turn off the first MOS transistor M1, VS is applied to the second MOS transistor M2 at the first voltage level to turn on the second MOS transistor M2 (S210).

When the first MOS transistor M1 is turned off and the second MOS transistor M2 is turned on, the ECU determines whether the voltage level of the valve monitoring signal VM is lower than a predetermined reference voltage Vref (S220). At this time, the ECU measures the time while the voltage level of the valve monitoring signal VM is lowered.

If it is determined that the voltage level of the valve monitoring signal VM is lowered to a predetermined reference voltage Vref or lower, the measurement time during which the voltage level of the valve monitoring signal VM is lowered, that is, The discharge time is calculated (S230). When the charge discharge time is calculated, the calculated charge discharge time is applied to Equation (6) to calculate the resistance of the valve coil, and the temperature of the valve coil is calculated by the resistance of the calculated valve coil (S240). Calculating the temperature of the valve coil with the resistance of the valve coil calculated here is because the resistance value of the valve coil varies linearly in proportion to temperature.

In the above description, the first MOS transistor M1 and the second MOS transistor M2 are turned on in response to a signal of a first voltage level on the assumption that they are the same channel (for example, N-channel) The channel of the first MOS transistor M1 and the channel of the second MOS transistor M2 may be different from each other.

The method according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

Claims (9)

A first MOS transistor connected between the battery power source and the valve coil of the solenoid valve and responsive to the failure diagnosis signal, for applying the battery power to the valve coil;
A second MOS transistor connected between the valve coil and a ground power supply and responsive to a valve activation signal, for connecting the valve coil to the ground power supply;
A measuring capacitor connected between the first node between the first MOS transistor and the valve coil and the ground power supply in parallel with the valve coil to charge and discharge the charge; And
The first MOS transistor and the second MOS transistor are controlled by outputting the fault diagnosis signal and the valve activation signal to sense a time when the voltage level of the first node drops in accordance with a discharge of the measurement capacitor, An ECU for monitoring the temperature of the coil; And a temperature sensor for monitoring the temperature change of the vehicle valve coil. The system as claimed in claim 1, wherein the ECU
The first MOS transistor is turned on to charge the measurement capacitor, and when the temperature of the valve coil is monitored, the first MOS transistor is turned off, the second MOS transistor is turned on, and the measurement capacitor is charged And discharges the electric charge that has passed through the valve coil. The vehicle-mounted valve coil monitoring apparatus according to claim 1,
Further comprising two distribution resistors connected in parallel with the valve coil and the measurement capacitor between the first node and the ground power supply to distribute the voltage at the first node,
Wherein the ECU receives a valve monitoring signal induced at a second node between the two distribution resistors and detects a drop in the voltage level of the first node. 4. The apparatus of claim 3, wherein the ECU
Measuring the time from when the measuring capacitor starts to discharge until the voltage level of the valve monitoring signal drops below a predetermined reference voltage and calculating and obtaining a resistance value of the valve coil from the measured time , And the temperature of the valve coil is calculated from the obtained resistance value of the valve coil. A method for monitoring a temperature change of a vehicular valve coil of a vehicular valve coil temperature monitoring apparatus including a first MOS transistor, a second MOS transistor, a measurement capacitor, and an ECU,
The ECU outputs a failure diagnostic signal to the first MOS transistor connected between the battery power source and the valve coil of the solenoid valve to turn off the valve diagnostic signal and turns on the second MOS transistor connected between the valve coil and the ground power supply, To turn on and enter a monitoring mode;
When the ECU discharges the charged charge through the first node between the first node between the first MOS transistor and the valve coil and the ground power source and the measuring capacitor connected in parallel with the valve coil, Determining whether a voltage level of one node falls below a predetermined reference voltage; And
Calculating a temperature of the valve coil using a time measured until the voltage level of the first node drops below the predetermined reference voltage after the ECU enters the monitoring mode; Wherein the temperature change of the valve coils of the vehicle is measured by the temperature sensor. 6. The method of claim 5, wherein determining whether the voltage drops below the reference voltage
Further comprising two distribution resistors connected in parallel with the valve coil and the measurement capacitor between the first node and the ground power supply to distribute the voltage of the first node,
Wherein the ECU receives a valve monitoring signal induced at a second node between the two distribution resistors and detects a drop in the voltage level of the first node. 6. The method of claim 5, wherein calculating the temperature of the valve coil
Calculating a resistance value of the valve coil from the measured time, and calculating a temperature of the valve coil using the resistance value of the valve coil obtained. 6. The method according to claim 5, wherein the temperature change monitoring method of the vehicular valve coil
Diagnosing whether the valve coil fails before entering the monitoring mode; And
The ECU turns on the first MOS transistor and turns off the second MOS transistor to charge the measurement capacitor; Further comprising the step of: detecting a temperature change of the valve coil in the vehicle. The method as claimed in claim 8, wherein the step of diagnosing whether or not the valve coil
After the ECU turns on the second MOS transistor in a state where the first MOS transistor is turned off, detecting a voltage level of the first node to determine a disconnection of the valve coil; And
Determining that the valve coil is short-circuited by sensing the voltage level of the first node after the ECU turns on the first MOS transistor; Wherein the temperature of the valve coils is set to a predetermined value.
KR1020140099039A 2014-08-01 2014-08-01 Apparatus and method for monitoring temperature chance of valve coil in vehicle KR20160015977A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102223767B1 (en) 2020-04-24 2021-03-05 서울대학교산학협력단 Fault detection method for electronic valve

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102223767B1 (en) 2020-04-24 2021-03-05 서울대학교산학협력단 Fault detection method for electronic valve

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