JPS6364322B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a lock detection device for automobile control equipment;
In particular, the present invention relates to a lock detection device that adjusts a lock detection level based on changes in the internal temperature of a vehicle.

Generally, as shown in FIG. 1, a vehicle air conditioner includes, in addition to a blower 1, an evaporator 2, a heater core 3, etc., an actuator 5 that controls the inside/outside air switching door 4, an actuator 7 that controls the air mixer door 6, a mode setting door 8, It is equipped with actuators 10, 11, etc., which control the actuators 5, 7, 10, 11, etc., and by driving the automobile control equipment consisting of the actuators 5, 7, 10, 11, the opening degree of each door is set to a predetermined value and air conditioning is performed. It is something to do. The actuators 5, 7, 10, and 11 are composed of a motor, an intermediate gear that reduces the rotational speed of the motor, an output gear, an envelope, etc., and each door is operated by reciprocating a link that is interlocked with the output gear. The opening degree of the gear can be controlled, and lubricating oil or the like is usually applied to the meshing portions of the intermediate gear and output gear. The above-mentioned motor is set to forward rotation, reverse rotation, and stop by the control device, but if the above-mentioned gear is missing or the door is clogged with foreign matter, the motor cannot rotate, that is, becomes locked. A lock detection device is provided to detect this and cut off the input to the motor. The conventional lock detection device compares and calculates a load signal corresponding to the motor load current with a preset lock detection signal, and determines that the lock is locked when the load signal becomes larger than the lock detection signal. It is configured.

However, according to the lock detection device of the conventional automobile control equipment, when the air conditioning switch is turned on and the air conditioner is started when the outside temperature is as low as -30°C, the intermediate gear constituting the actuator and the output For reasons such as hardening of the lubricating oil applied to the gears or freezing of moisture adhering to the links, etc., the load on the motor becomes larger than normal, and as a result, the above load signal becomes higher than normal. Since the lock detection device becomes larger than the above, the lock detection device is activated, which causes the motor to stop, resulting in the inconvenience that air conditioning cannot be performed at all. The so-called virtual lock caused by hardening of the lubricating oil or freezing of water adhering to the link is often released by continuing to rotate the motor against the load applied to the motor without cutting off the motor input. According to conventional lock detection devices, even with such a virtual lock, the motor input is cut off, so the actuator cannot be driven at all, or the actuator remains stopped for a long time, making air conditioning impossible in extremely cold weather, and causing damage to the occupants. There was also the risk of causing significant physical discomfort.

In the present invention, the magnitude of the lock detection signal of the lock detection device is adjusted by the output signal from the sensor that detects the interior air temperature, so that the magnitude of the lock detection signal can be adjusted at a time when the interior air temperature is still low, such as immediately after starting the air conditioner. Increase the value so that the motor input is not cut off by the virtual lock.
This method eliminates the above drawbacks and will be explained in detail below using examples.

FIG. 1 is a circuit diagram showing an embodiment of a lock detection device for an automobile control device according to the present invention. In the figure, 20 is a control circuit;
0 controls the motor drive circuit 21, and the motor drive circuit 21 sets the motor 22, which constitutes an actuator as an automobile control device, to rotate forward, reverse, or stop. The load current of the motor 22 is detected by a load detection circuit 23,
Load signal V ₀ from load detection circuit 23 is supplied to lock detection circuit 24 . Further, the lock detection circuit 24 is supplied with setting reference value signals V _s1 and V _s2 from a level setting circuit 25 for setting the magnitude of the lock detection signal. The control circuit 20 is a temperature setting device 26
The temperature setting signal T _D from the inside air sensor 27, the signal T _r from the outside air sensor 28, the signal V _a from the outside air sensor 28, and the signal T _s from the solar radiation sensor 29 are selectively transferred to the A/D converter 30.
A central processing unit 32 controls the motor drive circuit 21 and level setting circuit 25 based on the output from the A/D converter 30. The central processing unit 32 is composed of, for example, a microcomputer, which processes the signals T _D , T _r , T _a , T _s and generates control signals (not shown) for controlling the compressor, blower, air mixer door, etc. Based on the calculation result, the function sent from the port is compared with the opening signal _θ H from output terminals a and b,
By sending both L signals, the motor drive circuit 21 is controlled and the opening degree of various doors is controlled. That is, an H level signal is sent from output terminal a, an L level signal is sent from output terminal b to rotate the motor 22 in the forward direction, an H level signal is sent from output terminals a and b to stop the motor, and a signal from output terminal a is sent out from output terminal a to stop the motor. It has a function of sending out an H level signal from the L level output terminal b to reverse the motor 22. The central processing unit 32 also has a function of comparing and calculating the signal Tr from the inside air sensor 27 and the set temperature signal To, and sending out a control signal S from the output terminal C. That is, as shown in FIG. 3, the inside air temperature signal Tr gradually rises from the start of the engine and air conditioner, and when it becomes larger than the set temperature signal To,
A changeover switch circuit 3 that sends the control signal S to the level setting circuit 25 and configures the level setting circuit 25
It has a function to switch between 4 and 4. In the motor drive circuit 21, the output terminal a of the central processing unit 32 is
It has a transistor 37 connected to the base side via a diode 35 and a resistor 36, and a transistor 40 whose output terminal b of the central processing unit 32 is connected to the base side via a diode 38 and a resistor 39. A power supply is connected to the collector side of the transistor 37 via a diode 41 and a resistor 42, and the collector side is further connected to the base side of a transistor 44 via a resistor 43, and a diode 4 is connected to the collector side of the transistor 40.
5. A power supply is connected through a resistor 46, and its collector side is further connected to the base side of a transistor 48 through a resistor 47. The anode side of the diode 41 is connected to the base side of a transistor 50 via a diode 49, and the anode side of the diode 45 is connected to the base side of a transistor 52 via a diode 51. The transistors 44 and 50 are connected in series, and one end of the motor 22 is connected to their connection point, and the transistors 48 and 52 are connected in series, and the other end of the motor 22 is connected to their connection point. The load detection circuit 23 has one end connected to the transistors 50 and 52.
A resistor 53 is connected to the emitter side of the resistor 53 and the other end is grounded, a capacitor 54 is charged by the voltage appearing on the resistor 53, and a resistor 55 is connected between the resistor 53 and the capacitor 54. , the capacitor 54 and the resistor 55 are connected in proportion to the magnitude of the load current flowing through the resistor 53 of the load detection circuit 23.
The load signal Vo sent out from the connection point becomes larger. The lock detection circuit 24 has an operational amplifier 57 to which the load signal Vo sent from the load detection circuit 23 is supplied to the non-inverting input side via a resistor 56, and this operational amplifier 57 functions as a comparator. A switching circuit 34 constituting the level setting circuit 25 is connected to the inverting input side of the operational amplifier 57.
The output signal V _s1 or V _s2 from is supplied via a resistor 58 . The output side of the operational amplifier 57 is connected to transistors 37 and 4 via diodes 59 and 60.
It is supplied to the resistors 36 and 39 connected to 0.
The level setting circuit 25 consists of dividing resistors 61, 62 and 63, 64 connected in series with each other, and a setting reference signal V _s1 for setting a lock detection signal is obtained from the connection point of the resistors 61 and 62, and this signal
V _s1 is supplied to one fixed contact 34a of the switching circuit 34, and the setting reference V _s2 obtained from the connection point between the resistors 63 and 64 is supplied to the other fixed contact 34b of the switching circuit 34. In this case, V _s1 >
The resistance value of each of the resistors 61 to 64 is set in advance to be V _s2 .

The operation in the above configuration will be explained. First, when an H level signal is sent from one output terminal a of the central processing unit 32 that constitutes the control circuit 20 and an L level signal is sent from the output terminal b, the transistor 37 is turned on and the transistor 40 is turned off. Turns on transistor 44
is turned on, and when transistor 40 is turned off, transistor 52 is turned on, and the other transistors 48 and 50 are turned off. Therefore, the motor 22
The current flows from the power supply through transistor 44, motor 22, transistor 52, resistor 53, and ground.
IF flows and this causes forward rotation. As the motor 22 rotates forward, the opening degrees of various air control doors are set to predetermined values, and _the central processing unit When transistor 32 sends out H-level outputs from output terminals a and b, transistor 3
Since transistors 7 and 40 are both turned on, transistor 4
4 and 48 are turned on, transistors 50 and 52 are turned off, the above-mentioned current IF is cut off, and the motor is stopped. Next, when an L level signal is sent from the output terminal a of the central processing unit 32 and an H level signal is sent from the output terminal b, the transistor 37 is turned off, the transistor 40 is turned on, the transistors 48 and 50 are turned on, and the other transistors are turned off. is turned off, so a current in the opposite direction to the above-mentioned current flows through the motor 22, and the motor 22 is reversed. In this way, the motor 22 is set to the normal point, reverse point, and stop by the central processing unit 32 that constitutes the control circuit 20. Next, when the motor 22 becomes locked due to a defect in the gear that reduces the rotational force of the motor 22 or a clogged door, the current flowing through the resistor 53 of the load detection circuit 23 increases, and the terminal voltage increases. 54 is charged, i.e. the voltage at which capacitor 54 is charged.
The load signal sent from the connection point between and the resistor 55
Since Vo increases and becomes larger than the signal V _s1 or V _s2 supplied to the inverting input side of the operational amplifier 57, the output of the operational amplifier 57 is inverted to H level, turning on the transistors 37 and 40. 48 is on, transistors 50, 52
is turned off, the input to the motor 22 is cut off, and the motor is stopped.

According to the present invention, when the inside air temperature detected by the inside air sensor 27 is relatively high, the inside air temperature signal is
Since Tr is larger than the set temperature signal To, the control signal S
is sent out, and this control signal S causes the switching circuit 3 to
The movable contact 34c of No. 4 is switched to the fixed contact 34b side, and as a result, the setting reference signal V _s2 is supplied to the inverting input side of the operational amplifier 37, and the lock detection circuit 24
performs a lock detection operation by comparing and calculating this setting standard signal V _s2 and the load signal Vo, but if the internal air temperature is still low immediately after starting the engine and air conditioner, Tr<To, and the central processing Since the control signal S is not sent from the device 32, the movable contact 34c of the switching circuit 34 becomes the fixed contact 34a.
Therefore, the inverting input of the operational amplifier 57 is supplied with the signal V _s1 . This signal V _s1 is set larger than the signal V _s2 , and therefore, immediately after the engine and air conditioner start, lock detection is not performed unless the load signal Vo becomes considerably large, so the motor 22 easily stops. Not. Therefore, the motor does not come to a halt due to the virtual lock that occurs when the outside temperature is extremely cold, such as -30°C. This not only solves the problem of the air conditioner being unable to perform air conditioning operations and significantly reducing the feeling of the occupants, but also automatically releases the virtual lock state due to the motor being able to rotate excessively. In some cases, it is possible to automatically release the virtual lock.

Next, after a certain period of time has passed immediately after the engine and air conditioner are started, the inside air temperature rises due to the warm air from the air conditioner, and when the inside air temperature signal Tr becomes approximately equal to or larger than the set temperature signal To, a control signal S is sent. As a result, the movable contact 34c of the switching circuit 34 switches to the fixed contact 34b side, so that a signal V _s2 smaller than the signal V _s1 is supplied to the operational amplifier 57 as a lock detection signal, and the operation of the lock detection circuit 24 is performed. The amplifier 57 receives this set reference value signal V _s2
The lock is detected by comparing the load signal Vo and the load signal Vo.

As explained above, according to the present invention, in a lock detection device for an automobile control device that controls an air conditioner or the like by decelerating the rotational force of a motor, the load detection means detects the magnitude of the load on the motor; A lock detecting means compares the detection signal from the load detecting means with the lock detecting signal and sends a stop signal to the motor based on the comparison result, and the lock detecting signal supplied to the lock detecting circuit means determines the magnitude of the lock detecting signal. and a control means that determines the output signal from the inside air temperature sensor and controls the level setting means. Therefore, even if a virtual lock state occurs due to the hardening of the lubricating oil in the automotive control equipment or freezing of attached moisture,
Since the magnitude of the lock detection signal of the lock detection circuit is set to be large at this start point, the motor does not easily stop due to the virtual lock, so that the air conditioner cannot be operated. It is possible to prevent the feeling from decreasing due to the stoppage of the air conditioner, and since the motor can be rotated excessively to some extent, the virtual lock state can be automatically released and restored.

[Brief explanation of drawings]

FIG. 1 is a simplified configuration diagram showing an example of an air conditioner, and FIGS. 2 and 3 are a circuit diagram and an operation explanatory diagram showing an embodiment of a lock detection device for an automobile control device according to the present invention. 5, 7, 10, 11...actuator, 20
...Control circuit, 21...Motor drive circuit, 22...
...Motor, 23...Load detection circuit, 24...Lock detection circuit, 25...Level setting circuit, 30...
A/D converter, 31...Multiplexer, 32...
... central processing unit, 34 ... switching circuit, 57 ... operational amplifier.

Claims (1)

[Scope of Claims] 1. A lock detection device for an automobile control device that controls an air conditioner or the like by decelerating the rotational force of a motor, including a load detection means for detecting the magnitude of the load on the motor, and this load detection means. and the output signal from
A lock detection means for comparing and calculating a lock detection signal and transmitting a signal to cut off input to the motor based on the comparison result; and a level for adjusting the magnitude of the lock detection signal supplied to the lock detection means. An automobile control device comprising: a setting means; and a control means for comparing and calculating an output signal from an inside air temperature sensor of the vehicle with a setting signal and controlling the level setting means based on the calculation result. lock detection device. 2. The lock detection device for a control device for an automobile according to claim 1, wherein the control means comprises a processing device that performs a comparison calculation process on the output signal from the inside air temperature sensor and the setting signal stored in advance in a storage device. .