JP2021098436A - Vehicle height control device - Google Patents

Abstract

To provide a vehicle height control device which can control a vehicle height with high accuracy.SOLUTION: A vehicle height control device includes: a jack part in which a support member supporting a spring is moved so as to change a load of the spring; a supply part for supplying a liquid to the jack part by driving of a motor; and a control device which performs basic control of setting a target current value supplied to the motor as a first predetermined target value when the support member is moved so as to increase the load of the spring, and sets the target current value to be a second target value larger than the first target value when an actual current value that is actually supplied to the motor is equal to or more than a predetermined reference value during the basic control.SELECTED DRAWING: Figure 7

Description

The present invention relates to a vehicle height adjusting device that adjusts the height of a vehicle.

In recent years, a vehicle height adjusting device has been proposed that adjusts the height (vehicle height) of the vehicle body of the vehicle in order to make getting on and off easier and to adjust the posture of the vehicle.
For example, the front fork, the rear suspension, and the control device described in Patent Document 1 are an example of a vehicle height adjusting device that adjusts the vehicle height of a motorcycle.
Further, the vehicle height adjusting device described in Patent Document 2 has a support member for supporting one end of the suspension spring and a jack chamber, and the support member is moved by supplying liquid to the jack chamber to move the vehicle body. It is equipped with a vehicle height adjustment suspension that changes the height. Further, the vehicle height adjusting device described in Patent Document 2 has a pump-side oil chamber which is connected to a jack chamber via an oil passage and whose volume is variable by the movement of a pump-side piston, and is from the pump-side oil chamber to the jack chamber. It is equipped with a hydraulic pump that supplies liquid to the pump, a motor that drives a piston on the pump side, and a control device that controls the drive of the motor. More specifically, the hydraulic pump includes a thin-walled cylindrical pump-side cylinder and a lid portion that closes both ends of the cylindrical pump-side cylinder in the center line direction.

JP-A-2018-144650 Japanese Unexamined Patent Publication No. 2016-160968

In the hydraulic pump of the vehicle height adjusting device described in Patent Document 2, the piston (pump side piston) finishes discharging the liquid from the storage chamber (pump side oil chamber) and closes the end of the cylinder (pump side cylinder). If the motor is driven to move the piston to discharge the liquid even after hitting the lid, the motor may be overloaded. Therefore, when the piston hits the lid, it is necessary to stop the driving of the motor. For example, if the value of the current supplied to the motor is larger than the reference value, it is possible to presume that the piston has hit the lid and stop the drive of the motor. However, depending on the environment, such as when the piston starts to move at a low temperature, the current value supplied to the motor may be higher than the reference value, so even if the piston does not hit the lid, the piston will touch the lid. It is presumed that the piston has hit, and the drive of the motor may be stopped. In such a case, even though the piston has not moved to the desired position, the driving of the motor is stopped, and it becomes difficult to adjust the vehicle height to the desired height.
An object of the present invention is to provide a vehicle height adjusting device capable of adjusting a vehicle height to a desired height with high accuracy.

The present invention completed for this purpose includes a jack portion in which a support member supporting a spring moves so as to change the load of the spring, and a supply portion for supplying liquid to the jack portion by driving a motor. When the support member is moved to increase the load of the spring, the basic control is performed so that the target current value supplied to the motor is set to a predetermined first target value, and the basic control is performed. Occasionally, when the actual current value actually supplied to the motor becomes equal to or higher than a predetermined reference value, the control device sets the target current value as a second target value larger than the first target value. It is a vehicle height adjusting device provided with.

According to the present invention, it is possible to provide a vehicle height adjusting device capable of adjusting the vehicle height to a desired height with high accuracy.

It is a figure which shows an example of the schematic structure of the motorcycle which concerns on 1st Embodiment. It is a figure which shows an example of the schematic structure of the vehicle height adjustment device which concerns on 1st Embodiment. It is a figure which shows an example of the block diagram of a control device. It is a figure used for explaining the method which the target current setting part sets a target current value. It is a figure used for explaining the method which the target current setting part sets a target current value. It is a flowchart which shows an example of the procedure of the target current setting process performed by the target current setting unit. It is a flowchart which shows an example of the procedure of the target current setting process performed by the target current setting unit. It is a figure which shows an example of the transition of the target current value when the target current setting part which concerns on 2nd Embodiment determines that the movement amount of a piston has reached the maximum value. It is a figure which shows an example of the transition of the target current value when the target current setting part which concerns on 3rd Embodiment determines that the movement amount of a piston has reached the maximum value.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments shown below are examples of embodiments of the present invention, and the present invention is not limited to the embodiments shown below.

<First Embodiment>
FIG. 1 is a diagram showing an example of a schematic configuration of the motorcycle 1 according to the first embodiment.
FIG. 2 is a diagram showing an example of a schematic configuration of the vehicle height adjusting device 100 according to the first embodiment.
The motorcycle 1 includes a front wheel 2 which is a front wheel, a rear wheel 3 which is a rear wheel, a front wheel side sensor 4 which detects the rotation angle of the front wheel 2, and a rear wheel which detects the rotation angle of the rear wheel 3. It includes a side sensor 5.
Further, the motorcycle 1 includes a vehicle body frame 11 forming the skeleton of the motorcycle 1, a handle 12, a brake lever 13, and a vehicle body 10 having a seat 14.

Further, the motorcycle 1 has a front fork 21 that connects the front wheel 2 and the vehicle body 10. Further, the motorcycle 1 includes two brackets 15 for holding two front forks 21 arranged on the left and right sides of the front wheel 2, and a shaft 16 arranged between the two brackets 15. The shaft 16 is rotatably supported by the vehicle body frame 11. The front fork 21 includes a suspension spring 21s that absorbs the impact applied to the front wheel 2 from the road surface or the like, and a damping device 21d that damps the vibration of the suspension spring 21s.

Further, the motorcycle 1 has one rear suspension 22 for connecting the rear wheel 3 and the vehicle body 10 on the left side and one on the right side of the rear wheel 3. The rear suspension 22 includes a suspension spring 22s that absorbs the impact applied to the rear wheels 3 from the road surface and the like, and a damping device 22d that damps the vibration of the suspension spring 22s.
In the following description, the front fork 21 and the rear suspension 22 may be collectively referred to as a "suspension device 23". Further, the suspension spring 21s and the suspension spring 22s may be collectively referred to as "spring 23s". Further, the front wheels 2 and the rear wheels 3 may be collectively referred to as "wheels", and the vehicle body 10 may be referred to as a "body".

The suspension device 23 includes a jack portion 30 that adjusts the length of the spring 23s. As shown in FIG. 2, the jack portion 30 has a support member 31 that supports the end portion of the spring 23s on the vehicle body side, and a forming member 33 that forms the jack chamber 32 together with the support member 31, and the jack chamber 32. The length of the spring 23s is adjusted by moving the support member 31 according to the amount of liquid (for example, oil) inside. It can be exemplified that the support member 31, the jack chamber 32, and the forming member 33 are realized by the support member, the jack chamber, and the hydraulic jack of the rear suspension or the front fork described in Patent Document 1, respectively.

Further, the motorcycle 1 is provided with a supply device 40 for supplying a liquid to the jack chamber 32 of the jack portion 30.
As shown in FIG. 2, the supply device 40 includes a cylindrical cylinder 41, a cylindrical piston 42 that slides in the cylinder 41, and a circle that closes one end (right side in FIG. 2) of the cylinder 41. A plate-shaped lid portion 43 is provided. A storage chamber 44 for storing the liquid is formed in the space surrounded by the cylinder 41, the piston 42, and the lid portion 43. The piston 42 is formed with a columnar recess recessed from the end surface on the other side (left side in FIG. 2), and a female screw 42f is formed in this recess.

Further, as shown in FIG. 2, the supply device 40 includes a screw member 45 formed with a male screw 45 m that meshes with the female screw 42f formed on the piston 42. Further, the supply device 40 includes a motor 46 that rotates the screw member 45, and a speed reduction unit 47 that reduces the rotational speed and transmits the driving force of the motor 46 to the screw member 45. It can be exemplified that the motor 46 is a brushed direct current (DC) motor. As shown in FIG. 2, the reduction gear 47 includes a drive gear 47d mounted on the output shaft of the motor 46, a passive gear 47r mounted on the screw member 45, a first intermediate gear 47m that meshes with the drive gear 47d, and a passive gear 47d. It includes a gear unit 47u having a second intermediate gear 47n that meshes with the gear 47r.

Further, the supply device 40 is provided between the storage chamber 44 and the jack chamber 32 of the jack portion 30, and includes a hose 48 for flowing a liquid between the storage chamber 44 and the jack chamber 32.
Further, the supply device 40 includes a movement amount detection unit 49 that detects the movement amount of the piston 42. The movement amount of the piston 42 detected by the movement amount detection unit 49 is the movement amount when the movement amount when the piston 42 is located at the reference position is set to 0. The reference position is the position of the piston 42 when the liquid in the jack chamber 32 is 0 and the support member 31 is located closest to the vehicle body. In other words, the amount of liquid in the reservoir 44 is maximized when the piston 42 is in the reference position. It can be exemplified that the movement amount detecting unit 49 is a sensor that detects the position of the other end surface of the piston 42 with respect to the other end surface (left side in FIG. 2) of the cylinder 41. The movement amount detection unit 49 integrates the rotation angle of the screw member 45 or the motor 46 by using the output value from the sensor that detects the rotation angle of the screw member 45 or the motor 46, thereby increasing the movement amount of the piston 42. May be detected.

Further, the motorcycle 1 includes a control device 50 that controls the drive of the motor 46 of the supply device 40. The control device 50 will be described in detail later.

The vehicle height adjusting device 100 for adjusting the vehicle height of the motorcycle 1 is configured by the suspension device 23, the supply device 40, the control device 50, and the like configured as described above.
In the vehicle height adjusting device 100, the motor 46 of the supply device 40 rotates in one direction, so that the amount of movement of the piston 42 from the reference position increases, and the piston 42 discharges the liquid from the storage chamber 44. As a result, the liquid is supplied into the jack chamber 32 via the hose 48. Then, the support member 31 moves to the wheel side (right side in FIG. 2) with respect to the forming member 33, and the spring length of the spring 23s becomes shorter.

When the spring length of the spring 23s becomes shorter due to the movement of the support member 31 with respect to the forming member 33, the spring force with which the spring 23s pushes the support member 31 is increased as compared with the case before the support member 31 moves with respect to the forming member 33. growing. As a result, even if a force acts from the vehicle body to the wheel side, the initial load that does not change the relative positions of the two becomes large. In such a case, when the same force is applied from the vehicle body side to the wheel side, the amount of subduction of the suspension device 23 (change in the distance between the vehicle body and the wheels) becomes small. Therefore, when the spring length of the spring 23s becomes shorter due to the movement of the support member 31 with respect to the forming member 33, the height of the seat 14 increases as compared with the case before the support member 31 moves with respect to the forming member 33. (The vehicle height becomes higher).

On the other hand, when the motor 46 of the supply device 40 rotates in the other direction, the amount of movement of the piston 42 from the reference position becomes small, and the volume of the storage chamber 44 becomes large. Then, the support member 31 discharges the liquid in the jack chamber 32 and supplies it to the storage chamber 44. As a result, the support member 31 moves to the vehicle body side (left side in FIG. 2) with respect to the forming member 33, and the spring length of the spring 23s becomes longer.

When the spring length of the spring 23s becomes longer due to the movement of the support member 31 with respect to the forming member 33, the spring force with which the spring 23s pushes the support member 31 is increased as compared with the case before the support member 31 moves with respect to the forming member 33. It becomes smaller. As a result, when the same force is applied from the vehicle body side to the wheel side, the amount of subduction of the suspension device 23 becomes large. Therefore, when the spring length of the spring 23s becomes longer due to the movement of the support member 31 with respect to the forming member 33, the height of the seat 14 decreases as compared with the case before the support member 31 moves with respect to the forming member 33. (The vehicle height becomes lower).

(Control device 50)
Next, the control device 50 will be described.
FIG. 3 is a diagram showing an example of a block diagram of the control device 50.
The control device 50 includes a CPU, a ROM in which programs executed by the CPU, various data, and the like are stored, a RAM used as a working memory of the CPU, and an EEPROM which is a non-volatile memory. .. Output signals from the front wheel side sensor 4, the rear wheel side sensor 5, the movement amount detection unit 49, and the like described above are input to the control device 50.

The control device 50 calculates the rotation speed of the front wheel 2 based on the output signal from the front wheel side sensor 4, the front wheel side calculation unit 51, and calculates the rotation speed of the rear wheel 3 based on the output signal from the rear wheel side sensor 5. It is provided with a rear wheel side calculation unit 52 for calculation. The front wheel side calculation unit 51 and the rear wheel side calculation unit 52 each grasp the rotation angle based on the pulse signal which is the output signal from the sensor, and calculate the rotation speed by differentiating it with the elapsed time.

Further, the control device 50 uses at least one of the rotation speed of the front wheel 2 calculated by the front wheel side calculation unit 51 and the rotation speed of the rear wheel 3 calculated by the rear wheel side calculation unit 52 at the moving speed of the motorcycle 1. A vehicle speed grasping unit 53 for grasping a certain vehicle speed Vc is provided.

Further, the control device 50 has a motor control unit 60 that controls the drive of the motor 46 based on the vehicle speed Vc grasped by the vehicle speed grasping unit 53.
The front wheel side calculation unit 51, the rear wheel side calculation unit 52, the vehicle speed grasping unit 53, and the motor control unit 60 are realized by the CPU executing software stored in a storage area such as a ROM.

(Motor control unit 60)
The motor control unit 60 includes a target movement amount setting unit 61 that sets the target movement amount Lt of the piston 42, a target current setting unit 62 that sets the target current value It to be supplied to the motor 46, and a drive unit that drives the motor 46. It includes 63 and a current detection unit 64 that detects the actual current value actually flowing through the motor 46.

The target movement amount setting unit 61 sets the target movement amount Lt to a predetermined minimum target movement amount before the user gets on the motorcycle 1. Then, after the user gets on the motorcycle 1, the target movement amount setting unit 61 sets the target movement amount Lt to the target movement amount on the maximum side. It can be exemplified that the target movement amount on the minimum side is 0. It can be exemplified that the target movement amount on the maximum side is a value corresponding to the target vehicle height selected by the user via the user interface provided on the motorcycle 1.

Further, in the target movement amount setting unit 61, the subtraction value ΔL (= Lt-La) obtained by subtracting the detected movement amount La grasped by using the output value from the movement amount detection unit 49 from the target movement amount Lt becomes 0. If the actual vehicle height at that time is different from the target vehicle height, the target movement amount Lt is corrected. The corrected target movement amount Lt is set according to the difference between the actual vehicle height and the target vehicle height. It should be noted that the actual vehicle height can be exemplified by using the output value from the stroke sensor that detects the stroke amount of the suspension device 23.

Further, the target movement amount setting unit 61 uses the deviation between the load grasped by using the output value from the load sensor that detects the load generated on the seat 14 and the value predetermined according to the target vehicle height. The corrected target movement amount Lt may be set.
As described above, the target movement amount setting unit 61 sets the corrected target movement amount Lt as a new target movement amount Lt, so that the actual vehicle height becomes the target vehicle height, for example, for two-seater or luggage loading. Suppress the deviation from.

The target current setting unit 62 will be described in detail later.
The drive unit 63 includes, for example, a transistor (FET) as a switching element connected between the positive electrode side line of the power supply and the coil of the motor 46. Then, the drive of the motor 46 is controlled by driving the gate of the transistor and switching the transistor.
The current detection unit 64 detects the actual current value flowing through the motor 46 from the voltage generated across the shunt resistor connected to the drive unit 63.

(Target current setting unit 62)
4 and 5 are diagrams used for explaining a method in which the target current setting unit 62 sets the target current value It.
The target current setting unit 62 sets the piston 42 so that the target movement amount Lt determined by the target movement amount setting unit 61 and the detected movement amount La grasped by using the output value from the movement amount detection unit 49 match. Move.

When the piston 42 is moved in the direction of discharging the liquid from the storage chamber 44, the target current setting unit 62 sets the target current value It to a predetermined one-side target value. On the other hand, when the target current setting unit 62 moves the piston 42 in the direction of discharging the liquid from the jack chamber 32, the target current value It is set to a predetermined target value on the other side. It can be exemplified that the one-side target value is 8A and the other-side target value is -8A.

In determining the movement direction of the piston 42, the target current setting unit 62 first detects and moves the target movement amount Lt set by the target movement amount setting unit 61 using the output value from the movement amount detection unit 49. It is determined whether or not the subtraction value ΔL (= Lt-La) obtained by subtracting the quantity La is larger than 0. Then, when the subtraction value ΔL is larger than 0 (ΔL> 0), the target current setting unit 62 sets the target current value It to the one-side target value in order to move the piston 42 in the direction of discharging the liquid from the storage chamber 44. Set to. On the other hand, when the subtraction value ΔL is smaller than 0 (ΔL <0), the target current setting unit 62 sets the target current value It to the other side target value in order to move the piston 42 in the direction of discharging the liquid from the jack chamber 32. Set to. On the other hand, when the subtraction value ΔL is 0 (ΔL = 0), the target current setting unit 62 sets the target current value It to 0A.
In calculating the target current value It, it is possible to set feedback control so that the target movement amount Lt and the detected movement amount La match, and the subtraction value ΔL is proportionally processed by the proportional element and the integral element is used. The target current value It may be calculated by performing integration processing and adding these values in the addition calculation unit.
The above is the basic control performed by the target current setting unit 62.

The target current setting unit 62 determines whether or not the absolute value of the subtraction value ΔL is larger than the predetermined reference deviation, and if the absolute value of the subtraction value ΔL is equal to or less than the reference deviation, the target current value It. Is set to 0A, and if the absolute value of the subtraction value ΔL is larger than the reference deviation, the target current value It may be set to the one-side target value or the other-side target value according to the sign of the subtraction value ΔL. good.

Next, the determination control performed by the target current setting unit 62 will be described.
Here, even after the piston 42 finishes discharging the liquid from the storage chamber 44 and the piston 42 hits the lid 43, the motor 46 is driven to move the piston 42 to discharge the liquid from the storage chamber 44. , The motor 46 is overloaded. For example, if the movement amount detection unit 49 fails and the actual position of the piston 42 cannot be detected, the target current value It is set to the one-side target value even after the piston 42 hits the lid portion 43. This may result in excessive load on the motor 46.

Therefore, when the piston 42 hits the lid 43, in other words, when the movement amount of the piston 42 reaches the maximum value, it is necessary to stop the driving of the motor 46. For example, if the current value supplied to the motor 46 is larger than a predetermined reference value, it is estimated that the amount of movement of the piston 42 has reached the maximum value and the load on the motor 46 has increased, and the motor 46 is driven. It is possible to stop it. However, for example, when the motor starts to move at a low temperature, or when the tandem seat of the seat 14 has a heavier passenger than expected or a load heavier than expected is placed on the loading platform, the motor 46 is supplied. If the current value to be generated becomes larger than the reference value, it may be erroneously determined that the amount of movement of the piston 42 has reached the maximum value. When it is erroneously determined that the movement amount of the piston 42 has reached the maximum value and the drive of the motor 46 is stopped, the piston 42 of the piston 42 has not reached the target movement amount Lt even though the actual movement amount of the piston 42 has not reached the target movement amount Lt. Since the movement is stopped, it becomes difficult to adjust the vehicle height to the target height.

In view of the above items, the target current setting unit 62 performs the determination control described below in order to accurately determine whether or not the movement amount of the piston 42 has reached the maximum value.
The target current setting unit 62 determines whether or not the first condition is satisfied when the target current value It is set to the one-side target value. The first condition exemplifies that the period in which the detected current value Ia detected by the current detection unit 64 is equal to or greater than the predetermined first reference value continues for the predetermined first reference period. can do. It should be noted that the first reference value can be exemplified as having a current value smaller than the one-side target value, for example, 7.85A. It can be exemplified that the first reference period is 500 milliseconds (msec). The first condition may be that the detected current value Ia detected by the current detection unit 64 is equal to or higher than the first reference value.

Then, when the target current setting unit 62 determines that the first condition is satisfied, it temporarily determines that the movement amount of the piston 42 has reached the maximum value, and sets the target current value It from the one-side target value. Is set to the second target value set to a large value. It can be exemplified that the second target value is, for example, 12A.

Then, when the target current value It is set to the second target value, the target current setting unit 62 determines whether or not the second condition is satisfied within a predetermined determination period. The second condition can exemplify that the detected current value Ia is equal to or higher than a predetermined second reference value. In addition, it can be exemplified that the second reference value is a current value larger than the first reference value and the one-side target value and smaller than the second target value, and is, for example, 11.85A. Can be exemplified. It can be exemplified that the determination period is 500 milliseconds.

Then, when the target current setting unit 62 determines that the second condition is satisfied within the determination period, it officially determines that the movement amount of the piston 42 has reached the maximum value, as shown in FIG. , The target current value It is set to 0A in order to stop the driving of the motor 46. On the other hand, when the target current setting unit 62 determines that the second condition is not satisfied within the determination period, it temporarily determines that the movement amount of the piston 42 has reached the maximum value, as shown in FIG. Is released, and the target current value It is set as the one-side target value. That is, the target current setting unit 62 performs basic control.

FIG. 6 is a flowchart showing an example of the procedure of the target current setting process performed by the target current setting unit 62.
The target current setting unit 62 repeatedly executes this target current setting process, for example, every predetermined period (for example, 1 millisecond).
The target current setting unit 62 first determines whether or not the subtraction value ΔL (= Lt−La) obtained by subtracting the detected movement amount La from the target movement amount Lt is 0 (S601). Then, when ΔL is not 0 (no in S601), the target current setting unit 62 determines whether or not the subtraction value ΔL is larger than 0 (S602).

When the subtraction value ΔL is larger than 0 (yes in S602), the target current setting unit 62 sets the target current value It to the one-side target value (S603). On the other hand, when the subtraction value ΔL is not larger than 0 (no in S602), the target current setting unit 62 sets the target current value It to the other side target value (S604).
On the other hand, when ΔL is 0 (yes in S601), the target current setting unit 62 sets the target current value It to 0A (S605).

FIG. 7 is a flowchart showing an example of the procedure of the target current setting process performed by the target current setting unit 62.
The target current setting unit 62 repeatedly executes this target current setting process, for example, every predetermined period (for example, 1 millisecond).
The target current setting unit 62 first determines whether or not the target current value It is a one-sided target value (S701). When the target current value It is a one-sided target value (yes in S701), the target current setting unit 62 determines whether or not the first condition is satisfied (S702). That is, the target current setting unit 62 determines whether or not the period in which the detected current value Ia is equal to or greater than the first reference value continues for the first reference period.

Then, when the first condition is satisfied (yes in S702), the target current setting unit 62 sets the target current value It to the second target value (S703). On the other hand, if the first condition is not satisfied (no in S702), this process ends.
After setting the target current value It to the second target value in S703, it is determined whether or not the second condition is satisfied (S704). That is, it is determined whether or not the detected current value Ia is equal to or higher than the second reference value.

Then, when the second condition is satisfied (yes in S704), the target current setting unit 62 sets the target current value It to 0A (S705). On the other hand, when the second condition is not satisfied (no in S704), the target current setting unit 62 determines whether or not the determination period has elapsed after setting the target current value It to the second target value (no). S706).

Then, when the determination period has elapsed (yes in S706), the target current setting unit 62 sets the target current value It to the one-side target value (S707). On the other hand, when the determination period has not elapsed (no in S706), the target current setting unit 62 performs the processing after S704.

Assuming that the first condition is satisfied because the target current setting unit 62 performs the above-mentioned target current setting process, for example, when the load starts to move at a low temperature or when the maximum load is temporarily increased. (Even if the period in which the detected current value Ia is equal to or higher than the first reference value continues for the first reference period), it is suppressed that the driving of the motor 46 is immediately stopped. As a result, it is suppressed that the movement of the piston 42 is stopped even though the actual movement amount of the piston 42 has not reached the target movement amount Lt. As a result, the vehicle height is adjusted to a desired height with high accuracy.

As described above, the vehicle height adjusting device 100 according to the first embodiment includes a jack portion 30 in which the support member 31 that supports the spring 23s moves according to the amount of liquid contained in the jack chamber 32. A supply device 40 as an example of a supply unit that supplies liquid into the jack chamber 32 by driving a motor 46 is provided. Further, the vehicle height adjusting device 100 sets the target current value It supplied to the motor 46 as one side target value as an example of the first target value when the support member 31 is moved to increase the load of the spring 23s. It is provided with a control device 50 that performs basic control. Then, when the control device 50 is performing the basic control, the actual current value actually supplied to the motor 46, in other words, the detected current value Ia becomes equal to or higher than the first reference value, the target current value is reached. It is set as a second target value larger than the one-side target value.

Then, after setting the target current value It as the second target value, the control device 50 can determine whether or not the movement amount of the piston 42 has reached the maximum value depending on whether or not the second condition is satisfied. become. As a result, the control device 50 reaches the target movement amount Lt in the actual movement amount of the piston 42 as compared with stopping the driving of the motor 46 when the detected current value Ia becomes equal to or higher than the first reference value. It suppresses the movement of the piston 42 from being stopped even though the piston 42 is not moved. As a result, according to the vehicle height adjusting device 100, the vehicle height can be adjusted to a desired height with high accuracy.

The control device 50 is an example of a determination value in which the detection current value Ia is set to a value larger than the reference value within a predetermined determination period when the target current value It is set as the second target value. When the value becomes equal to or higher than the second reference value, the drive of the motor 46 is stopped. When the detected current value Ia becomes equal to or higher than the second reference value, it can be determined that the movement amount of the piston 42 has reached the maximum value, so that the control device 50 stops driving the motor 46. As a result, it is possible to prevent the motor 46 from being overloaded.

When the target current value It is set as the second target value, the control device 50 performs basic control when the detected current value Ia does not exceed the determination value within the determination period. That is, the control device 50 sets the target current value It as the one-side target value. As a result, the actual movement amount of the piston 42 does not reach the target movement amount Lt due to the temporary increase in the load when the control device 50 starts to move at a low temperature or when the maximum load is loaded. Nevertheless, it is possible to suppress the movement of the piston 42 from being stopped.

When the control device 50 continues the first reference period as an example of a predetermined period in which the detected current value Ia is equal to or greater than the first reference value during basic control, the control device 50 continues the target current value. It is set as the second target value. As a result, for example, it is possible to prevent the target current value It from being frequently set as the second target value due to noise generated in the output value from the current detection unit 64.

<Second embodiment>
FIG. 8 is a diagram showing an example of a transition of the target current value It when the target current setting unit according to the second embodiment determines that the movement amount of the piston 42 has reached the maximum value.
The target current setting unit according to the second embodiment is used for determining whether the target current value It is set to 0A or one side target value with respect to the target current setting unit 62 according to the first embodiment. Two conditions are different. Hereinafter, the points different from the first embodiment will be described. The same reference numerals and terms are used for those having the same function and meaning in the first embodiment and the second embodiment, and detailed description thereof will be omitted.

The target current setting unit according to the second embodiment determines that the second condition is that the period in which the detected current value Ia is equal to or greater than the second reference value continues for the second reference period. It should be noted that the second reference period can be exemplified to be 100 milliseconds, which is a period shorter than the determination period. That is, in the target current setting unit according to the second embodiment, when the target current value It is set to the second target value, the period during which the detected current value Ia is equal to or greater than the second reference value is within the determination period. When the second reference period is continued, it is officially determined that the movement amount of the piston 42 has reached the maximum value, and the target current value It is set to 0A in order to stop the driving of the motor 46.
As a result, it can be determined with high accuracy that the amount of movement of the piston 42 has reached the maximum value.

<Third embodiment>
FIG. 9 is a diagram showing an example of a transition of the target current value It when the target current setting unit according to the third embodiment determines that the movement amount of the piston 42 has reached the maximum value.
The target current setting unit according to the third embodiment is used for determining whether the target current value It is set to 0A or one side target value with respect to the target current setting unit according to the second embodiment. The conditions are different. Hereinafter, the points different from the second embodiment will be described. In the second embodiment and the third embodiment, the same reference numerals and terms are used for those having the same function and meaning, and detailed description thereof will be omitted.

The target current setting unit according to the third embodiment determines that the second condition is that the period in which the detected current value Ia is equal to or greater than the second reference value has occurred a predetermined number of times predetermined to continue for the third reference period. And. In addition, it can be exemplified that the third reference period is 100 milliseconds, which is a period shorter than the determination period. Further, it can be exemplified that the predetermined number of times is two times. That is, in the target current setting unit according to the third embodiment, when the target current value It is set to the second target value, the period during which the detected current value Ia is equal to or greater than the second reference value is within the determination period. When the continuation of the third reference period occurs a predetermined number of times, it is officially determined that the movement amount of the piston 42 has reached the maximum value, and the target current value It is set to 0A in order to stop the driving of the motor 46. Set.
As a result, it can be determined with high accuracy that the amount of movement of the piston 42 has reached the maximum value.

1 ... Motorcycle, 2 ... Front wheel, 3 ... Rear wheel, 10 ... Vehicle body, 14 ... Seat, 21 ... Front fork, 22 ... Rear suspension, 23s ... Spring, 30 ... Jack part, 31 ... Support member, 32 ... Jack Room, 40 ... Supply device, 41 ... Cylinder, 42 ... Piston, 43 ... Lid, 44 ... Storage chamber, 46 ... Motor, 49 ... Movement amount detection unit, 50 ... Control device, 60 ... Motor control unit, 61 ... Target Movement amount setting unit, 62 ... target current setting unit, 63 ... drive unit, 64 ... current detection unit

Claims (6)

A jack portion in which the support member that supports the spring moves so as to change the load of the spring, and
A supply unit that supplies liquid to the jack unit by driving a motor,
When the support member is moved to increase the load of the spring, the basic control is performed so that the target current value supplied to the motor is set to a predetermined first target value, and the basic control is performed. In addition, a control device that sets the target current value as a second target value larger than the first target value when the actual current value actually supplied to the motor becomes equal to or higher than a predetermined reference value.
Vehicle height adjustment device equipped with. When the target current value is set to the second target value, the control device sets the actual current value to a value larger than the reference value within a predetermined determination period. The vehicle height adjusting device according to claim 1, wherein the driving of the motor is stopped when the vehicle becomes. The vehicle height according to claim 2, wherein the control device stops driving the motor when a period in which the actual current value is equal to or greater than the determination value continues within a predetermined reference period within the determination period. Adjustment device. The control device performs the basic control when the actual current value does not exceed the determination value within a predetermined determination period when the target current value is set to the second target value. The vehicle height adjusting device according to claim 2 or 3. When the control device performs the basic control and the period in which the actual current value is equal to or greater than the reference value continues for a predetermined period of time, the target current value is referred to as the second target value. The vehicle height adjusting device according to any one of claims 1 to 4. The supply unit includes a cylindrical cylinder, a piston that slides in the cylinder, and a lid portion that closes an end portion of the cylinder, and the piston is moved toward the lid portion by driving the motor. By allowing the liquid in the cylinder to be supplied to the jack portion,
Any one of claims 1 to 5, wherein the control device drives the motor in a direction of moving the piston toward the lid when the support member is moved to increase the load of the spring. Vehicle height adjustment device described in.

Images