JP2004106729A - Drive controller for opening/closing body of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drive controller for an opening/closing body of a vehicle capable of substantializing both speed adjustment by PWM control during motor drive by one semiconductor switch, and control power adjustment upon regenerative braking, and having an advantageous structure for reducing cost. <P>SOLUTION: A motor driving circuit 9 is composed: by connecting a first relay 11 which is a mechanical contact mechanism between one end side of a motor 2 and a battery 5, and a second relay 12 which is a mechanical contact mechanism between the other end side of the motor 2 and the battery 5; by connecting a third relay 13 and a fourth relay 14 which are mechanical contact mechanisms, between a ground GND and both of the first relay 11 and the second relay 12, respectively; and by connecting a FET15 which is the semiconductor switch between the third relay 13 and the fourth relay 14. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a drive control device for driving and controlling a vehicle opening / closing body such as a sliding door and a back door of a vehicle using a motor.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a drive control device that automatically opens and closes a vehicle opening / closing body such as a sliding door or a back door of a vehicle by a forward rotation drive or a reverse rotation drive of a motor has been proposed and has been put to practical use. In such a drive control device for an opening / closing body for a vehicle, a motor drive circuit is generally configured using semiconductor switches such as a plurality of field effect transistors (FETs), and ON / OFF of the plurality of semiconductor switches is performed. By controlling the turning-off, the energizing direction to the motor is switched so that the vehicle opening / closing body is moved in both directions of the opening direction and the closing direction. Further, in this type of drive control device, the opening / closing speed is generally controlled by performing pulse width modulation (PWM) on the pulse input to the plurality of semiconductor switches. (For example, see Patent Document 1).
[0003]
Also, when the vehicle is stopped on a steep slope, the opening / closing speed of the vehicle opening / closing body may exceed the target speed due to the effect of its own weight. If the opening / closing speed cannot be suppressed to the target speed, the motor drive circuit is closed to put the motor in a regenerative braking state, and a braking force is applied to the vehicle opening / closing body, so that the opening / closing speed is adjusted to the target speed. Techniques for approaching this have also been proposed. In this case, if the braking force by the regenerative brake becomes too large, the opening / closing speed of the vehicle opening / closing body rapidly decreases and a smooth opening / closing operation is hindered. A regenerative braking state and a free state in which the regenerative braking is released are alternately set to adjust the braking force applied to the vehicle opening / closing body (for example, see Patent Document 2).
[0004]
[Patent Document 1] JP-A-11-303505 [Patent Document 2]
Japanese Patent Application Laid-Open No. Hei 10-246061
[Problems to be solved by the invention]
By the way, in the above-mentioned conventional drive control device, four switching means are connected to a motor to form a motor drive circuit, and the speed control by PWM control when driving the motor and the braking force adjustment during regenerative braking are performed. In order to realize both, a semiconductor switch such as an FET which can be turned on / off at high speed is used for at least two of these four switching means.
[0006]
However, since a semiconductor switch such as an FET is itself relatively expensive, a circuit configuration using a plurality of such semiconductor switches poses a problem in reducing the cost of a motor drive circuit. In addition, since the semiconductor switch generates a large amount of heat during operation, a motor drive circuit using a plurality of such semiconductor switches requires a large-scale heat radiation mechanism to be installed, which also reduces the cost of the motor drive circuit. There is a problem that it is difficult.
[0007]
The present invention has been made in view of the above-described conventional circumstances, and can realize both speed adjustment by PWM control when driving a motor and braking force adjustment during regenerative braking with one semiconductor switch. It is an object of the present invention to provide a drive control device for a vehicle opening / closing body having an advantageous configuration for reducing costs.
[0008]
[Means for Solving the Problems]
According to the first aspect of the present invention, the motor is operated in one of a forward rotation driving state, a forward rotation regenerative braking state, a reverse rotation driving state, and a reverse rotation regenerative braking state, thereby opening and closing the vehicle opening / closing body and the opening / closing speed thereof. A drive control device for a vehicle opening / closing body to be controlled, wherein the drive control device is provided between one end of the motor and a battery and between the other end of the motor and the battery, and is connected between the motor and the battery. First and second relays, which are mechanical contact mechanisms for switching states, are provided between each of the first and second relays and a ground, and connect the motor to the ground. Third and fourth relays, which are mechanical contact mechanisms for switching, and a semiconductor switch provided between the third relay and the fourth relay and operated by a pulse input. And it is characterized in and.
[0009]
In the drive control device for a vehicle opening / closing member according to the first aspect, the motor may be in the third state regardless of whether the motor is in the forward drive state, the forward regenerative brake state, the reverse drive state, or the reverse regenerative brake state. Since the semiconductor switch provided between the relay and the fourth relay is necessarily interposed in the circuit, the semiconductor switch is turned on / off at a high speed, so that the motor is driven in the normal rotation state and the reverse rotation state. In the state, high-precision speed adjustment by the PWM control is realized, and when the motor is in the forward rotation regenerative braking state and the reverse rotation regenerative braking state, highly accurate adjustment of the braking force can be realized.
[0010]
According to a second aspect of the present invention, in the drive control device for a vehicle opening / closing body according to the first aspect, the third relay and the fourth relay are configured as two-circuit two-contact relays. It is characterized by having.
[0011]
In the drive control device for a vehicle opening / closing body according to the second aspect, the third relay and the fourth relay are configured as two-circuit, two-contact relays, and the third relay and the fourth relay are provided. Are simultaneously controlled by a common input, so that these switching controls can be easily performed.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0013]
FIG. 1 schematically shows the entire configuration of a drive control device for a vehicle opening / closing body to which the present invention is applied. The drive control device 1 includes a motor 2 serving as a drive source for opening and closing a vehicle opening / closing body such as a sliding door or a back door of a vehicle, a rotary encoder 3 for detecting a rotation pulse of the motor 2, The vehicle includes an operation switch 4 operated by an occupant, a battery 5, and a controller 6. The drive control device 1 calculates the opening / closing speed of the vehicle opening / closing body based on the rotation pulse of the motor 2 detected by the rotary encoder 3, and generates a pulse signal for bringing the opening / closing speed close to a predetermined target speed. And a relay for switching and controlling each relay included in a motor drive circuit described later according to the operation input from the operation switch 4 and the opening / closing speed of the vehicle opening / closing body calculated by the pulse generation circuit 7. The controller 6 includes a control circuit 8 and a motor drive circuit 9 for driving the motor 2.
[0014]
As shown in FIG. 2, the motor drive circuit 9 includes a first relay 11 which is a mechanical contact mechanism provided between one end of the motor 2 and the battery 5, and the other end of the motor 2 and the battery 5. The second relay 12 is a mechanical contact mechanism provided between the first relay 11 and the second relay 12, and the second relay 12 is a mechanical contact mechanism provided between both the first relay 11 and the second relay 12 and the ground GND. The semiconductor device includes a third relay 13 and a fourth relay 14, and a MOS-type N-channel FET 15 which is a semiconductor switch provided between the third relay 13 and the fourth relay 14.
[0015]
The first relay 11 and the second relay 12 are connected to the battery 5 with a normally open contact NO in common. The normally closed contact NC of the first relay 11 is connected to the normally closed contact NC of the third relay 13 and the normally open contact NO of the fourth relay 14, and the normally closed contact NC of the second relay 12 is , Is connected to the normally open contact NO of the third relay 13 and the normally closed contact NC of the fourth relay 14. The movable contact TR of the first relay 11 is connected to one terminal of the motor 2, and the movable contact TR of the second relay 12 is connected to the other terminal of the motor 2. In the motor drive circuit 9, the first relay 11 and the second relay 12 function as switches for switching the connection state between the motor 2 and the battery 5.
[0016]
The movable contact TR of the third relay 13 is connected to the drain of the FET 15, and the movable contact TR of the fourth relay 14 and the source of the FET 15 are connected to the ground GND. That is, the FET 15 is interposed between the movable contact TR of the third relay 13 and the movable contact TR of the fourth relay 14. Further, the third relay 13 and the fourth relay 14 are configured as two-circuit, two-contact relays, and switching operations are performed simultaneously with a common input. In the motor drive circuit 9, the third relay 13 and the fourth relay 14 function as switches for switching the connection state between the motor 2 and the ground GND.
[0017]
Further, the pulse signal P1 generated by the pulse generation circuit 7 is input to the gate of the FET 15, and the input of the pulse causes the FET 15 to operate so that on / off switching can be performed at high speed. ing. The semiconductor switch is not limited to such a MOS N-channel FET 15, but any semiconductor switch that can be switched on / off at high speed by pulse input can be applied.
[0018]
In the motor drive circuit 9 configured as described above, the first relay 11, the second relay 12, the third and the fourth relay 13 are respectively switched and controlled according to the control signal from the relay control circuit 8. Thus, the motor 2 is operated in any of the forward drive state, the forward regenerative brake state, the reverse drive state, and the reverse regenerative brake state.
[0019]
That is, in response to a control signal from the relay control circuit 8, the first relay 11 is turned on, the movable contact TR is brought into contact with the normally open contact NO, the second relay 12 is turned off, and the movable contact TR is normally turned off. The contact is brought into contact with the closed contact NC. Further, the third relay 13 and the fourth relay 14 are energized to bring the respective movable contacts TR into contact with the normally open contacts NO. Thereby, as shown in FIG. 3, a circuit in which current flows in the order of the battery 5, the first relay 11, the motor 2, the second relay 12, the third relay 13, the FET 15, and the ground GND is formed. 2 is operated in the normal rotation drive state. When the motor 2 is operated in the normal rotation drive state, for example, a driving force in the opening direction acts on the vehicle opening / closing body such as the slide door or the back door.
[0020]
At this time, a pulse signal P1 subjected to PWM control is generated by the pulse generation circuit 7 in accordance with the rotation speed of the motor 2, and the ON / OFF of the FET 15 is switched at a high speed in accordance with the pulse signal P1 to thereby rotate the motor 2. The speed is controlled, and the speed is adjusted with high accuracy so that the opening speed of the vehicle opening / closing body approaches the target speed.
[0021]
Further, in response to a control signal from the relay control circuit 8, the first relay 11 is turned off and the movable contact TR is brought into contact with the normally closed contact NC. The second relay 12 is turned on and the movable contact TR is normally turned off. It is brought into contact with the open contact NO. Further, the third relay 13 and the fourth relay 14 are turned off, and the respective movable contacts TR are brought into contact with the normally closed contacts NC. As a result, as shown in FIG. 4, a circuit in which a current flows in the order of the battery 5, the second relay 12, the motor 2, the first relay 11, the third relay 13, the FET 15, and the ground GND is formed. 2 is operated in the reverse rotation driving state. When the motor 2 is operated in the reverse rotation driving state, a driving force in a closing direction, for example, acts on a vehicle opening / closing body such as a slide door or a back door.
[0022]
At this time, a pulse signal P1 subjected to PWM control is generated by the pulse generation circuit 7 in accordance with the rotation speed of the motor 2, and the ON / OFF of the FET 15 is switched at a high speed in accordance with the pulse signal P1 to thereby rotate the motor 2. The speed is controlled, and the speed is adjusted with high accuracy so that the closing speed of the vehicle opening / closing body approaches the target speed.
[0023]
Further, in response to a control signal from the relay control circuit 8, the first relay 11 is turned off and the movable contact TR is brought into contact with the normally closed contact NC. The second relay 12 is turned off and the movable contact TR is turned off. It is brought into contact with the normally closed contact NC. Further, the third relay 13 and the fourth relay 14 are turned off, and the respective movable contacts TR are brought into contact with the normally closed contacts NC. Thereby, as shown in FIG. 5, a closed circuit circulating in the order of the motor 2, the first relay 11, the third relay 13, the FET 15, the fourth relay 14, the second relay 12, and the motor 2 is configured. Thus, the motor 2 is operated in the forward rotation regenerative braking state, which is the dynamic braking state. When the motor 2 is operated in the forward rotation regenerative braking state, a braking force for suppressing the driving force in the opening direction, for example, acts on the vehicle opening / closing body such as the slide door or the back door.
[0024]
At this time, when the FET 15 is operated with the pulse signal P1 generated by the pulse generation circuit 7 by periodic repetition, the FET 15 is turned off while the pulse signal P1 is at the Lo level, thereby forming an open circuit. It is in a free state where the regenerative brake is released. Then, the ON / OFF of the FET 15 is switched at a high speed in response to the pulse signal P1, thereby alternately setting the normal regenerative braking state and the free state, whereby the magnitude of the braking force applied to the vehicle opening / closing body is increased. Will be adjusted. Also in this case, similarly to the PWM control at the time of the forward rotation drive or the reverse rotation drive, the period of the Hi level of the pulse signal P1 and the Lo level of the pulse signal P1 are changed according to the rotation speed of the motor 2, that is, the moving speed of the vehicle opening / closing body. By changing the duty of the period, the magnitude of the braking force can be more finely adjusted.
[0025]
Further, in response to a control signal from the relay control circuit 8, the first relay 11 is turned off and the movable contact TR is brought into contact with the normally closed contact NC. The second relay 12 is turned off and the movable contact TR is turned off. It is brought into contact with the normally closed contact NC. Further, the third relay 13 and the fourth relay 14 are energized to bring the respective movable contacts TR into contact with the normally open contacts NO. Thereby, as shown in FIG. 6, a closed circuit circulating in the order of the motor 2, the second relay 12, the third relay 13, the FET 15, the fourth relay 14, the first relay 11, and the motor 2 is configured. Then, the motor 2 is operated in the reverse rotation regenerative braking state, which is the power generation braking state. When the motor 2 is operated in the reverse rotation regenerative braking state, a braking force that suppresses, for example, the driving force in the closing direction acts on the vehicle opening / closing body such as the slide door or the back door.
[0026]
At this time, the on / off state of the FET 15 is switched at a high speed by the pulse signal P1 generated by the pulse generation circuit 7 by periodic repetition, and the reverse regenerative braking state and the free state are alternately set, thereby opening and closing the vehicle. The magnitude of the braking force acting on the body will be adjusted. Also in this case, similarly to the PWM control at the time of the forward rotation drive or the reverse rotation drive, the period of the Hi level of the pulse signal P1 and the Lo level of the pulse signal P1 are changed according to the rotation speed of the motor 2, that is, the moving speed of the vehicle opening / closing body. By changing the duty of the period, the magnitude of the braking force can be more finely adjusted.
[0027]
When the motor 2 is operated in each of the patterns of the forward rotation driving state, the forward rotation regenerative braking state, the reverse rotation driving state, and the reverse rotation regenerative braking state as described above, the first to fourth relays 11, 12, 13, and 14 are operated. FIG. 7 shows a list of how the switching is performed. By switching the first to fourth relays 11, 12, 13, and 14 as shown in FIG. 7, the motor 2 is driven in the normal rotation driving state, the normal rotation regenerative braking state, the reverse rotation driving state, and the reverse rotation regenerative braking state. Whichever pattern is used, the FET 15 is necessarily interposed in the circuit.
[0028]
Therefore, when the motor 2 is operated in the forward rotation driving state or the reverse rotation driving state, the rotation speed of the motor 2 is adjusted by switching on / off the FET 15 at a high speed by the PWM-controlled pulse signal P1. The opening / closing speed of the opening / closing body can be close to the target speed. When the motor 2 is operated in the forward rotation regenerative braking state or the reverse rotation regenerative braking state, the ON / OFF of the FET 15 is switched at high speed by the pulse signal P1 to alternate the motor 2 between the regenerative braking state and the free state. Thus, the magnitude of the braking force applied to the vehicle opening / closing body can be adjusted with high accuracy.
[0029]
As described above, in the drive control device 1 for a vehicle opening / closing body to which the present invention is applied, the motor drive circuit 9 of the controller 2 includes the first to fourth relays 11, 12, and 13 which are four mechanical contact mechanisms. , 14 and an FET 15 which is one semiconductor switch, and switches the first to fourth relays 11, 12, 13, 14 to drive the motor 2 in the forward rotation driving state, the forward rotation regenerative braking state, and the reverse rotation driving. State, or reverse regenerative braking state, and by switching ON / OFF of the FET 15 at high speed, the opening / closing speed of the vehicle opening / closing body is controlled with high precision at the time of forward rotation driving or reverse rotation driving, and At the time of forward regenerative braking or reverse regenerative braking, the braking force applied to the vehicle opening / closing body is adjusted with high precision. That is, the drive control device 1 is configured such that a function similar to the function realized by using a plurality of FETs in the related art can be realized by one FET 15.
[0030]
Therefore, in the drive control device 1, a problem caused by the conventional configuration of the motor drive circuit using a plurality of FETs, that is, the FET itself is relatively expensive, The opening and closing operation of the vehicle opening and closing body and the opening and closing speed of the opening and closing body for a vehicle can be increased without causing a problem that a large heat dissipation mechanism for dissipating a large amount of heat is required and hinders the cost reduction. It can be controlled with high precision.
[0031]
Further, in the drive control device 1, the third relay 13 and the fourth relay 14 of the motor drive circuit 9 are configured as two-circuit, two-contact relays, and the third relay 13 and the fourth relay Since the switching of 14 is controlled simultaneously by a common input, these switching controls can be easily performed.
[0032]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the operation state of the motor used as a drive source is controlled by using the 1st-4th relay which is a mechanical contact mechanism, and one semiconductor switch, and switching of these, and the opening / closing body for vehicles Since the opening / closing operation and the opening / closing speed are controlled, the opening / closing operation of the vehicle opening / closing body and the opening / closing operation of the vehicle opening / closing body are realized while realizing a reduction in apparatus cost, which has been difficult when a plurality of semiconductor switches are used. The opening / closing speed can be controlled with high accuracy.
[Brief description of the drawings]
FIG. 1 is a block diagram schematically showing a drive control device for a vehicle opening / closing body to which the present invention is applied.
FIG. 2 is a circuit diagram showing a motor drive circuit provided in the drive control device for the vehicle opening / closing body.
FIG. 3 is an operation explanatory diagram showing a state where the motor is operated in a normal rotation drive state by the motor drive circuit.
FIG. 4 is an operation explanatory diagram showing a state where the motor is operated in a reverse rotation driving state by the motor driving circuit.
FIG. 5 is an operation explanatory diagram showing a state where the motor is operated in a forward rotation regenerative braking state by the motor drive circuit.
FIG. 6 is an operation explanatory diagram showing a state where the motor is operated in a reverse rotation regenerative braking state by the motor drive circuit.
FIG. 7 is a view showing a list of a relationship between an operation state of the motor and switching control of first to fourth relays.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 vehicle opening / closing body drive control device 2 motor 5 battery 6 controller 9 motor drive circuit 11 first relay 12 second relay 13 third relay 14 fourth relay 15 FET

Claims (2)

Drive control of a vehicle opening / closing body that controls the opening / closing operation of the vehicle opening / closing body and its opening / closing speed by operating the motor in one of a forward rotation driving state, a forward rotation regenerative braking state, a reverse rotation driving state, and a reverse rotation regenerative braking state A device,
First and second mechanical contact mechanisms provided between the one end of the motor and the battery and between the other end of the motor and the battery, respectively, for switching a connection state between the motor and the battery. A second relay;
Third and fourth relays, which are provided between both the first and second relays and ground, and are mechanical contact mechanisms for switching a connection state between the motor and the ground,
A drive control device for a vehicle opening / closing body, comprising: a semiconductor switch provided between the third relay and the fourth relay and operated by a pulse input. The drive control device for a vehicle opening / closing body according to claim 1, wherein the third relay and the fourth relay are configured as a relay having two circuits and two contacts.

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