KR200383028Y1 - A driving control apparatus for car cooperation blower motor be possessed of trouble diagnosis function - Google Patents

Abstract

The air conditioner blower motor drive control apparatus for a vehicle having an abnormal diagnosis function is to protect the blower motor even in the case of poor contact with the heat sink and to improve the reliability of the operation. The present invention uses a FET module with an internal temperature sensing function as a control element for controlling the blower motor instead of eliminating the temperature fuse attached to the heat sink for overheating protection. When the device's operating temperature rises above, it electrically cuts off the voltage of the FET gate to protect the blower motor from overheating and prevents damage to the FET, the control element, and also blocks the drive signal itself applied to the FET gate so that noise does not occur in the blower motor. It is composed. Therefore, the present invention does not need to attach a heat fuse separately to the heat sink, thereby reducing the cost and the number of manufacturing processes, and directly sensing the temperature of the control element to perform more reliable operation, and according to the temperature change inside the FET. The voltage applied to the blower motor provides an effect to prevent the noise caused by repeated.

Description

A driving control apparatus for car cooperation blower motor be possessed of trouble diagnosis function}

The present invention relates to a blower motor drive control device for an automobile, and in particular, to directly detect the temperature of the FET itself, a blower motor drive control element, to perform thermal protection and fault diagnosis, and to perform a more reliable operation. An air conditioner blower motor drive control apparatus for a vehicle having a function is provided.

In order to maintain a proper temperature in a vehicle, the vehicle maintains a temperature by introducing hot or cold air into the vehicle. Air inflow for the temperature control is performed by a blower fan (Fan), the fan (Fan) is rotated by a blower motor (Blower Motor).

In general, a blower motor driving apparatus for driving a blower motor performs linear control using a field effect transistor (FET) element. This is schematically illustrated in FIG. 1.

1 is a schematic configuration of a blower motor driving apparatus for a vehicle using a conventional FET module, the blower motor driven by the power of the battery (Batter) is the gate end of the MOSFET (MOSFET) Controlled according to the control signal (Control Signal) input to. That is, the battery voltage Vmotor applied to the blower motor takes a voltage obtained by subtracting the voltage Vds across the MOSFET from the vehicle battery voltage Vbat. This can be summarized as follows.

Vmotor = Vbat-Vds

Here, Vmotor is a blower motor applied voltage, Vbat is a battery voltage, Vds is a voltage drop between the FET drain and the source.

The voltage drop between the FET drain and the source is released as heat, and the heat sink (not shown) is attached to the device to emit heat. In addition, by attaching a thermal fuse separately to the heat sink to sense the temperature of the heat sink contact portion, if the temperature rises beyond the heat dissipation capacity of the heat sink, the temperature fuse is melted to short the negative terminal of the blower motor power supply. The blower motor is protected by shutting off the power. In addition, when the blower motor is constrained, the electric current rises above the allowable current by the counter electromotive force of the blower motor. In this case, the temperature of the heat sink is also increased so that the temperature fuse is melted.

However, the conventional protection method of the blower motor is a structure in which only the temperature of the heat sink is increased without raising the temperature of the heat sink even when the contactor is in poor contact due to a problem in the attachment of the control element and the heat sink. It has a problem that the control element itself breaks down before the temperature fuse is melted. In addition, there is a disadvantage in that the entire FET module, which is a control element, needs to be replaced during melting of the temperature fuse.

Accordingly, an object of the present invention is to detect the temperature of the control element FET itself, not the heat sink to protect the blower motor and the control element even when the contact with the heat sink is poor, in order to solve the above problems, indirect through the heat sink It is to provide a vehicle air conditioning blower motor drive control device that can perform a more reliable operation by a direct sensing method that detects the temperature of the device itself, rather than the phosphorus temperature sensing.

It is also an object of the present invention to diagnose an abnormality by receiving a feedback signal applied to the above-described FET so as to prevent the "ON / OFF" repetition of the blower motor by the internal temperature change of the FET. An air conditioner blower motor drive control apparatus having a function is provided.

The air conditioner blower motor drive control apparatus for a vehicle having an abnormal diagnosis function of the present invention for achieving the above object, in the apparatus for controlling the blower motor drive for the vehicle, the blower motor, the blower motor is connected to the drain, A control signal is input to a gate to control the blower motor driving, and senses its own temperature to electrically cut off the voltage of the gate to protect the blower motor from overheating and to prevent the occurrence of self failure, and the FET control The control signal is applied to the gate of the device, and when the abnormality is detected by detecting the voltage of the FET gate, the heater control unit for blocking the control signal itself applied to the FET gate.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 shows a configuration of a blower motor drive control apparatus for a vehicle according to the present invention. The blower motor drive control device shown in FIG. 2 is configured in the same manner as the conventional device of FIG. A new FET module including a function of sensing temperature is employed as the control element 20. Here, the FET module, which is the control element 20, uses a VNW50N04A or an Infineon company BTS282Z, etc. of ST, in which the temperature sensing unit 21 for sensing the temperature of the FET device itself is used. The blower motor drive control device of FIG. 2 also includes a heater controller 30 for applying a control signal to the control element 20. The heater controller 30 is composed of a microcomputer 31 and a drive circuit 32, and feeds the feedback line 33 so that a control signal applied from the drive circuit 32 to the control device 20 is fed back to the microcomputer 31. Form. The operation of diagnosing an abnormal occurrence in the blower motor system in the automotive air conditioner blower motor drive control device of FIG. 2 having such a configuration will be described in detail with reference to FIGS. 3 and 4.

In FIG. 2, the blower motor 10 driven by the power of the battery is controlled according to a control signal input to the gate terminal of the MOSEFT, which is the control element 20. The control device 20 uses a FET module in which the temperature sensing unit 21 is incorporated. The drain of the FET module is connected to the blower motor 10 and the control signal is input to the gate to drive the MOSFET.

The temperature detector 21 inside the FET module, which is the control device 20, senses the temperature of the device itself and blocks the voltage of the FET gate when the detected temperature rises above the operating temperature of the control device 20. It prevents the damage of the control element 20 in advance, and thereby has a structure to protect the blower motor 10. That is, when the blower motor 10 is restrained, the voltage of the FET gate is electrically cut off, and when the blower motor 10 is released, the signal is applied to the gate to operate normally.

By the way, when the blower motor 10 is constrained, the control element 20 electrically switches the gate signal of the FET module to the ground level, but as shown in FIG. If it goes down, it turns "Turn On" again, and accordingly, if the temperature goes up, it "turns off" repeatedly. There is a concern that noise may occur in the blower motor 10 due to the repetition of the "ON / OFF". That is, when the blower motor 10 is constrained, the FET repeats " ON / OFF " due to internal temperature change. Accordingly, the phenomenon in which the voltage is applied to the blower motor 10 is repeated, thereby generating noise generated in the blower motor 10 driving torque.

In order to solve this problem, a feedback line 33 is formed in the heater controller 30 generating the FET driving signal. In order to control the blower motor 10, the microcomputer 31 of the heater controller 30 first selects a user motor stage (step 401) and then calculates a motor driving signal (step 402). The microcomputer 31 generates the motor drive signal in the form of pulse width modulation (PWM) or digital-analog (D / A) in accordance with the calculated motor drive signal (step 403). The drive circuit 32 receives a PWM or D / A signal and outputs a signal for driving the FET, which is the control element 20. At this time, the signal applied to the FET is fed back to the A / D port of the microcomputer 31 through the feedback line (33). The microcomputer 31 senses a feedback signal input to the A / D port (step 404), and determines whether the feedback signal is a ground level (step 405). In the normal operation, the FET gate applied voltage is sensed in the feedback line 33. As the internal temperature of the FET increases when the motor is locked, the FET itself switches the gate signal to the ground level, which causes the FET to be " turned off ". At this time, the microcomputer 31 gates through the feedback line 33. It detects that the signal has changed to ground level and determines that FET protection has been activated. If the feedback signal is not the ground level, the microcomputer 31 determines the normal operation state and repeats the operation from step 401 to control the blower motor 10. The microcomputer 31 blocks the motor driving signal applied to the FET gate to prevent the "ON / OFF" repetition of the blower motor 10 when the feedback signal is at the ground level (step 406). It is determined that an abnormality has occurred in the system of the motor 10 (step 407). That is, as shown in FIG. 3, the microcomputer 31 blocks the motor driving signal itself during the temperature hysteresis period of the FET so that the phenomenon in which the voltage is applied to the blower motor 10 is not repeated.

As described above, the automotive air conditioner blower motor drive control device having an abnormal diagnosis function of the present invention, unlike the conventional temperature fuse attached to the heat sink to directly detect the internal temperature of the control element of the FET to rise above the operating temperature When an abnormal phenomenon occurs, the blower motor and the control element can be protected from damage. In addition, the cost can be reduced by eliminating the temperature fuse, eliminating the process of attaching the temperature fuse to the heat sink in the manufacturing process and soldering to the substrate, and can also be used semi-permanently without replacing the FET module. .

In addition, the FET driving signal is fed back from the heater controller to determine the operation of the protection function, thereby blocking the FET driving itself, thereby preventing noise from occurring in the motor driving torque.

1 is a schematic view showing a blower motor driving apparatus for a vehicle using a conventional FET module,

2 is a block diagram showing a blower motor driving device for a vehicle using a new FET module according to the present invention,

3 is a graph showing a repeating operation state according to a change in internal temperature of a FET;

4 is a flow chart for explaining the microcomputer operation of FIG.

<Description of the symbols for the main parts of the drawings>

10 blower motor 20 control element

21: temperature detection unit 30: heater controller

31: microcomputer 32: drive circuit

33: feedback line

Claims (4)

In the apparatus for controlling the blower motor drive for automobiles, Blower motors; The blower motor is connected to the drain, a control signal is input to the gate to control the blower motor driving, and senses its own temperature to electrically cut off the voltage of the gate to protect the blower motor from overheating and prevent the occurrence of its own failure. FET control element for; And The control signal is applied to the gate of the FET control element, and when the abnormality is detected by detecting the voltage of the FET gate, a vehicle having a fault diagnosis function including a heater control unit for blocking the control signal itself applied to the FET gate Air-conditioning blower motor drive control device. The method of claim 1, wherein the FET control element has a function of sensing an internal cell temperature, and when the detected temperature rises above the normal operating temperature, the gate voltage is cut off. An air conditioner blower motor drive control device for an automobile having an abnormal diagnosis function, characterized in that being applied. The method of claim 1, wherein the heater control unit A microcomputer for generating a control signal for driving the blower motor; A drive circuit for applying a driving signal to the FET control element according to the control signal generated by the microcomputer; And And an feedback line for feeding back the output of the drive circuit to the A / D port of the microcomputer. 4. The vehicle having an abnormality diagnosis function according to claim 3, wherein the microcomputer detects that the voltage of the FET gate has changed to the ground level through the feedback line and blocks the driving signal itself applied to the FET gate. Air conditioning blower motor drive control device.