JP3556438B2 - Vehicle motor control device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a motor control device for a vehicle that obtains a target value corresponding to an operating state of the vehicle and controls a control motor to follow the target value.
[0002]
[Prior art]
It is known that, in a conventional vehicle engine, since the rotational speed and load fluctuation are large, the operating state of the engine is detected, and various control valves are opened and closed to perform optimal control of the engine. For example, an exhaust control valve is provided on the downstream open side of the exhaust pipe, and the exhaust valve is fully opened in the high-speed range of the engine to maximize the dynamic efficiency of the exhaust system to increase the output. There is a method of preventing the occurrence of torque valley due to the reverse effect of the dynamic effect by closing the control valve to about 1/2 (Japanese Patent Publication No. 7-78370). Also, various proposals have been made in which a control valve is provided in a plurality of intake pipes, and the control valve is opened and closed according to the speed of the internal combustion engine to substantially change the length of the intake pipe.
[0003]
[Problems to be solved by the invention]
When these control valves are controlled by the motor to follow the target opening, a state occurs in which the motor keeps repeating forward and reverse rotation as shown in FIG.
In other words, in the figure, when the load is light and the inertia of the rotating part is large, the motor passes through the target zone A despite the fact that the motor enters the target zone A and stops the motor, and the motor deviates from the target value. The case where the operation of passing A is repeated is shown.
[0004]
Intermittent or continuous forward / reverse rotation of the motor in such a state means that a large starting current is repeatedly supplied to the motor, and the motor temperature rises excessively, shortening the motor life and performing optimal motor control. There was a problem that it was not possible.
[0005]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it has been proposed that the rotation angle of a motor that opens and closes various control valves such as a throttle valve and an exhaust valve provided in a vehicle be changed by controlling the rotation angle of an engine. When performing follow-up control to achieve a rotation angle that corresponds to the operating state , the motor current may be interrupted near the target value, causing the motor to vibrate or repeat forward / reverse rotation, thereby damaging the motor. It is an object of the present invention to provide a motor control device for a vehicle, which prevents the motor life and improves the control accuracy with respect to a target value and enables optimal motor control.
[0006]
[Means for Solving the Problems]
The present invention relates to a vehicle for controlling a rotation angle of a motor for opening and closing various control valves such as a throttle valve and an exhaust valve provided in the vehicle so as to be a rotation angle corresponding to an operation state of an engine. The following configuration is adopted in the motor control device.
[0007]
That is, a motor control device for a vehicle according to claim 1 includes a means for detecting the operating state of the engine, and a target value for obtaining a target value of the rotation angle of the motor based on the detection output of the detection means. Calculating means; current value detecting means for obtaining a current value which is a current rotation angle of the motor; outputting a motor control signal based on a difference between the target value and the current value; A control means for outputting a reverse rotation signal for forcibly stopping the motor when the value reaches the value, and a driver for driving the motor based on the motor control signal, wherein the control means reduces an output time of the reverse rotation signal. It is characterized by being changed by the rotation angle of the motor.
[0008]
A motor control device for a vehicle according to claim 2, further comprising: means for detecting an operation state of the engine; and target value calculating means for obtaining a target value of a rotation angle of the motor based on a detection output of the detection means. Current value detecting means for calculating a current value that is a current rotation angle of the motor; anda motor control signal is output based on a difference between the target value and the current value. Control means for outputting a reverse rotation signal for forcibly stopping the motor when it arrives; and a driver for driving the motor based on the motor control signal, wherein the control means outputs an output time of the reverse rotation signal of the engine. It is characterized by being changed by the number of rotations.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a block diagram showing the entire system of a vehicle motor control device according to the present invention, and FIG. 2 is a functional block diagram showing the same.
[0010]
The engine 1 is a two-cycle engine, and has an exhaust valve 3 at an exhaust port 2. The exhaust valve 3 is connected to a motor 5 by a wire cable 4, and the exhaust valve 3 is opened and closed by the motor 5. The spring 6 is for assisting the closing or opening operation of the exhaust valve 3. The motor 5 is equipped with a potentiometer 7 as current value detecting means, and detects the current rotation angle of the motor.
As the operating state detecting means, a rotation sensor 9 is provided on the crankshaft 8 to detect the engine speed.
The throttle valve (not shown) is provided with a throttle sensor 10 for detecting a throttle opening.
[0011]
The control unit 11 has various functions such as a CPU 12 and a motor driver 13.
Further, the CPU 12 is provided with various functions such as a target value calculating means 14, a control means 15, a timer measuring means 16 and the like, based on the results calculated by the target value calculating means 14, the control means 15 and the timer measuring means 16. And outputs a motor control signal to the motor driver 13. The target value calculation means 14 retrieves data corresponding to the engine speed and the throttle opening from the target map, and calculates the target value of the exhaust valve.
Further, the motor driver 13 receives a control signal from the CPU 12 and controls a drive current to the motor 5.
[0012]
Next, the operation of the present invention will be described based on the control flowchart of FIG.
In the present invention, a series of operations described below are repeatedly performed by the timer measuring means 16 at predetermined time intervals (for example, every 5 msec).
First, the CPU 12 detects information such as the engine speed and the throttle opening by the rotation sensor 9 and the throttle sensor 10 as operating state detecting means, and the target value calculating means 14 uses the obtained information to set the target value and the target value. The target zone having a predetermined width with the center value as the center value is calculated.
Next, the current value of the motor 5 is detected by a potentiometer 7 which is current value detecting means. The direction in which the motor 5 is to be driven (here, the forward direction) is calculated from the positional relationship between the current value and the target value.
[0013]
Next, the target zone is compared with the current value, and the control content is selected from a drive mode, a stop mode, and a brake mode.
That is, when the current value is outside the target zone, the driving mode is set and a forward driving signal is output to the driver 13.
If it is within the target zone, it is determined whether it is within the brake zone. That is, even if the motor 5 is within the target zone, the motor 5 does not stop due to a large inertia of the motor or the like. If the motor 5 exceeds the target value, the brake mode is set. Output to
[0014]
The reverse rotation signal in the brake mode in this case is output for a predetermined time as described later to reverse the motor 5 (only the reverse rotation is started and the motor itself is not reversely rotated). That is, a signal (pulse) for reverse rotation is sent to the motor 5 rotating in the forward rotation to forcibly perform the reverse rotation operation and stop. By applying the reverse rotation signal, the rotational force rotating in the forward rotation side is canceled. Let them stop there. As a result, the rotational force (inertia) of the motor 5 is canceled and the motor 5 is stopped. While the predetermined time has not elapsed, the brake mode is continued, and after the predetermined time has elapsed, the stop mode described below is set.
When the current value is within the target zone and outside the brake zone, the stop mode is set and a stop signal is output to the driver 13. The stop mode indicates that the drive terminals of the motor 5 are short-circuited or both terminals are grounded. In this state, no driving force is applied to the motor 5 from the driver 13.
[0015]
As described above, if the control motor is controlled to follow the target value obtained from the engine operating state, the target value does not deviate from the target value after reaching the target value, thereby improving the control accuracy. In addition, since the fine intermittent operation near the target value and the forward / reverse operation due to hunting do not occur, the problem that the motor is overheated and the life is shortened does not occur.
[0016]
Here, the reverse rotation signal in the brake mode is output for a predetermined time as described above, but the predetermined time in this case is changed according to the magnitude of the rotation angle of the motor 5. That is, the exhaust valve 3 opens and closes when the motor 5 winds or rewinds the wire cable 4. However, since the wire cable 4 is provided with the spring 6, the exhaust valve 3 is opened more. The winding force of the motor 5 is large, and conversely, a small force is required when the motor 5 is closed. The relationship between the rotation angle of the motor 5 and the force of rewinding the motor 5 is as shown in FIG.
[0017]
That is, since the winding force of the motor 5 is different between the winding start and the winding end of the wire cable 4 due to the spring 6, if the reverse rotation signal output time is constant, the motor 5 does not stop at the target position or the motor 5 reversely rotates. I do. Therefore, in the first embodiment, the output time of the reverse rotation signal is changed according to the rotation angle of the motor 5. Specifically, when the rotation angle of the motor 5 is large, the output time is lengthened, and when the rotation angle is small, the output time is shortened.
[0018]
In the first embodiment, by controlling the drive of the exhaust valve motor 5 provided in the exhaust port 2, the valve is opened in the high speed range of the engine, closed in the middle speed range, and the torque valley in the middle speed range is controlled. Is to prevent the occurrence of. However, similar effects can be obtained by applying the present invention to control of other motors such as a control valve motor for controlling the intake pipe length.
[0019]
Further, in the above description, the case where the engine speed and the throttle opening are detected by the rotation sensor 9 and the throttle sensor 10 as the operating state detecting means has been described. The operation state may be detected based on the operation state.
[0020]
Embodiment 2 FIG.
In the first embodiment, the case where the reverse rotation signal output time is changed according to the rotation angle of the motor has been described. However, the reverse rotation signal output time can be changed according to the engine speed.
That is, as shown in FIG. 5, the valve opening is determined by the engine speed, and the force applied to the motor 5 differs depending on the valve opening as described in the second embodiment. The reverse signal output time is switched at the boundary.
[0021]
【The invention's effect】
According to the motor control device for a vehicle according to the first aspect of the present invention, when the target value is reached, the control means outputs a reverse rotation signal to the motor to forcibly stop the motor. It will not deviate from the value. For this reason, control accuracy is improved, and fine intermittent operation near the target value and forward / reverse rotation operation due to hunting do not occur, so that problems such as shortening of life due to overheating of the motor do not occur. In addition, since the output time of the reverse rotation signal is changed in accordance with the rotation angle of the motor, even when the load applied to the motor varies depending on the rotation angle of the motor, appropriate control can be performed in accordance with the change.
[0022]
According to the motor control device for a vehicle according to the second aspect of the present invention, when the target value is reached, the control means outputs a reverse rotation signal to the motor to forcibly stop the motor. It will not deviate from the value. For this reason, control accuracy is improved, and fine intermittent operation near the target value and forward / reverse rotation operation due to hunting do not occur, so that problems such as shortening of life due to overheating of the motor do not occur. In addition, since the output time of the reverse rotation signal is changed according to the engine speed, even when the control valve has an appropriate opening degree that varies depending on the engine speed, appropriate control can be performed in accordance with the change.
[Brief description of the drawings]
FIG. 1 is a configuration diagram showing an entire system of a vehicle motor control device according to a first embodiment of the present invention.
FIG. 2 is a functional block configuration diagram of a vehicle motor control device according to Embodiment 1 of the present invention.
FIG. 3 is a control flowchart of the vehicle motor control device according to the first embodiment of the present invention.
FIG. 4 is a graph showing a relationship between a motor rotation angle and a motor rewinding force according to the first embodiment of the present invention.
FIG. 5 is a graph showing a relationship between an engine speed and a valve opening according to a second embodiment of the present invention.
FIG. 6 is a graph showing a vibration and a hunting state of a conventional motor.
[Explanation of symbols]
1 engine, 5 motors, 7 potentiometers, 9 rotation sensors, 10 throttle sensors, 13 drivers, 14 target value calculation means, 15 control means.

Claims (2)

A motor control device for a vehicle for controlling the rotation angle of a motor that opens and closes various control valves such as a throttle valve and an exhaust valve provided in the vehicle so that the rotation angle corresponds to the operating state of the engine. Means for detecting the operating state of the engine; target value calculating means for obtaining a target value of the rotation angle of the motor corresponding to the detection output of the detection means; and a current rotation angle of the motor. and the current value detecting means for obtaining a certain current value, outputs a motor control signal have groups Dzu the difference between the target value and the current value, when the current value has reached the target value, forcing the motor motor control means for outputting a reversing signal for stopping, and a driver for driving the motor based on the motor control signal, the control means, the output time of the reverse rotation signal to the Vehicle motor control apparatus, characterized in that to change the rotation angle. A motor control device for a vehicle for controlling the rotation angle of a motor that opens and closes various control valves such as a throttle valve and an exhaust valve provided in the vehicle so that the rotation angle corresponds to the operating state of the engine. Means for detecting the operating state of the engine; target value calculating means for obtaining a target value of the rotation angle of the motor corresponding to the detection output of the detection means; and a current rotation angle of the motor. Current value detecting means for obtaining a certain current value, and outputting a motor control signal based on a difference between the target value and the current value, and forcibly stopping the motor when the current value reaches the target value. Control means for outputting a reverse rotation signal for stopping; and a driver for driving the motor based on the motor control signal, wherein the control means controls the output time of the reverse rotation signal. Vehicle motor control apparatus, characterized in that to change the rotational speed.

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