JPS6315504Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a control circuit suitable for operating a power window of an automobile or the like, which drives a window regulator by rotating a motor in forward or reverse directions to raise and lower a window glass.

This type of control circuit energizes the motor to raise and lower the window glass while the switch is pressed in manual operation, and energizes the motor to raise and lower the window glass until it is fully open or fully closed in automatic operation.

However, with conventional circuits, if the window glass rushes into the blade of the door before the window glass is fully opened or closed, the motor is loaded and the switch is released, causing the window glass to completely enter the blade. There were many times when I couldn't get in.

To explain further details with reference to Figures 1 and 2,
FIG. 1 shows the position of the window glass 2 with respect to the door 1, and FIG. 2 shows the characteristics of the current flowing through the motor at each position of the window glass 2.

In this figure, position D indicates the position where the window glass 2 is about to enter the blade 11 of the door 1, and position E indicates the fully closed state. Conventionally, the amount of current B applied to the motor when the window glass 2 abuts the blade 11 turns off the switch and stops the motor. This caused the inconvenience that the window glass 2 could not be fully closed. This invention has been made in view of the above points, and its purpose is to detect the increase in motor current after a delay time when the window glass enters the door blade. To provide a window control circuit for an automobile, etc., which can always move a window glass to a fully closed position because the motor is stopped.

Next, an embodiment of this invention will be described with reference to FIG.

First, in FIG. 3, _S1 is a switch for raising the window glass, and _S2 is a switch for lowering the window glass, which is kept in the on state when a solenoid S, which will be described later, is energized. Furthermore, each switch
For S ₁ and S ₂ , the solid line indicates the off state, and the dotted line indicates the on state. M is a motor that controls the raising and lowering of the window glass, and when the current flows in the direction of the solid line, the window glass is raised, and when the current flows in the direction of the dotted line, it is lowered.

3 is a self-holding and releasing circuit, which has the following circuit configuration. R ₁ and R ₂ are divided resistors for generating a reference voltage to determine the release current, R ₃ is a resistor for current detection, and CP ₁ has one terminal at the connection point with the above divided resistors R ₁ and R ₂ . Above switches S ₁ , S ₂ and resistor R ₃
A comparator with the + terminal connected to the connection point with
When the potential on the + terminal side is higher than on the - terminal side, the output becomes high level. R ₈ and R ₉ are divided resistors similar to the above resistors R ₁ and R ₂ , and CP ₂ is a resistor whose + terminal forms a time constant circuit at the connection point of the above divided resistors R ₈ and R ₉ .
A second comparator has one terminal connected to the connection point of _R7 and capacitor _C1 , and the output of the first comparator _CP1 becomes high level, and after the time constant of the time constant circuit, the output becomes low level. It is what it is. Q is a transistor that is turned on when the output from the comparator CP ₁ is at a high level; S is a solenoid that is energized when the transistor Q is turned on and keeps the switches S ₁ and S ₂ on; and R ₄ is the above comparator CP ₁
hysteresis resistor, _R5 is the base resistance of transistor Q, and _R6 is the Zener diode described later.
D ₄ is a protective resistor, D ₁ and D ₂ are diodes for backflow prevention, D ₃ is a diode for preventing back electromotive force of solenoid S, D ₄ is a Zener diode for absorbing surge from motor M and for constant voltage, R ₇ , _C1 are the resistors and capacitors that make up the time constant circuit. _R10 is a hysteresis resistance of the comparator _CP2 , and _R11 is a load resistance of the first comparator _CP1 .

Next, to explain the operation of the circuit shown in FIG.
When S ₁ is switched from the solid line position to the dotted line position, +B switches S ₁ - Motor M - Switch S ₂
- A current flows through the resistor _R3 , causing the motor M to rotate in the direction of raising the window glass 2, while flowing through the switch _S1 to the self-holding and releasing circuit 3; At this time, the current flowing through _the motor M is in the range A to D in FIG _. It is at a low level. Also, since the + terminal side of the comparator CP ₂ is connected to the connection point of the dividing resistors R ₈ and R ₉ , the potential of the + terminal > the - terminal, and the output of the comparator CP ₂ is at a high level, and therefore the transistor When Q is turned on, solenoid S is energized and switch _S1 is kept on.

Then, when the windshield comes into contact with the door blade and the amount of current to motor M becomes large, the comparator
One end of _CP1 becomes the potential of the + terminal, and its output becomes high level. Here, when the output of the comparator CP ₁ becomes high level, charging of the capacitor C ₁ is started via the resistor R ₇ , and one terminal of the comparator CP ₂ does not become high potential immediately. Therefore, transistor Q
is maintained in the on state, and the motor M continues to rotate to raise the window glass to the fully closed position. and resistance
After a delay of the time constant of the time constant circuit formed by _R7 and the capacitor _C1 , the potential of the comparator _CP2 becomes one terminal>+terminal, and the output of the comparator _CP2 becomes a low level. As a result, the transistor Q is turned off and the current to the solenoid S is cut off, so that the switch _S1 returns to its original state and all operations are stopped.

Note that when the switch _S2 for lowering the window glass 2 is operated, the position is changed from the solid line position to the dotted line position, and the following operations are the same as those described above, so a description thereof will be omitted.

In addition, the resistance that constitutes the time constant circuit in Fig. 3
It is also possible to connect a thermistor instead of _R7 . In this case, the lower the temperature of the thermistor connected, the longer the delay time will be, and the lower the temperature, the harder the window glass of the door will be and the slower the rate of rise, so the longer the delay time, the better. That is, the delay time can be adjusted to the temperature characteristics of the window glass.

As mentioned above, this idea detects that the amount of current to the motor has become large and then cuts off the current to the motor after a delay time due to the time constant of the time constant circuit, so automatic operation is possible. After a certain period of time after the window glass contacts the door blade, the raising stops, so that the window glass can always be raised to the fully closed position.

In addition, even if the load increases while the window is being raised and lowered automatically and the motor current exceeds the set value, the window can be reliably raised and lowered without stopping as long as it is within a predetermined time.

[Brief explanation of drawings]

Figure 1 is a diagram showing the raised state of the window glass.
FIG. 2 is a diagram showing the relationship between the motor current and the raised position of the window glass, and FIG. 3 is a circuit diagram showing an embodiment of the window raising/lowering control circuit according to this invention. 1...door, 2...window glass, 3...self-holding and release circuit, _S1 , _S2 ...switch, S...
Solenoid, Q...transistor, _R7 , _C1 ...
Resistors and capacitors make up the time constant circuit.

Claims (1)

[Scope of utility model registration request] In a window raising/lowering control circuit for automobiles, etc., which detects an overcurrent in the motor when raising/lowering the windshield and cuts off the power to the motor, the voltage generated in the resistor inserted in the energizing path of the motor is compared with a set value. The output of the first comparator is input to the second comparator through a delay circuit made of CR, and when the motor current flows beyond the set value for a set time or more, the motor A window lift control circuit characterized by cutting off electricity to the window.