JPH04129865A - Auxiliary wheel device for vehicle - Google Patents

Abstract

PURPOSE:To prevent the departure of a vehicle in a condition where an auxiliary wheel device is lowered by detecting release from a condition unable to transmit power, and outputting a rise signal to an elevating device based on an detection output signal. CONSTITUTION:A rise signal is outputted to an elevating device M3 with a control device M2 based on the output signal of a setting release condition detection means M1 detecting the release of the output axis and the gear shifter device output axis of an engine from a condition unable to transmit power. An auxiliary wheel is raised with the elevating device M3 based on the rise signal. Consequently an auxiliary wheel storing action is made prior to the departure of a vehicle. This can prevent the departure of the vehicle in a condition where an auxiliary device is lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a liftable auxiliary wheel device provided at the front or rear of a vehicle.

[Conventional technology]

Conventionally, in this type of device, an auxiliary wheel is provided at the rear of the vehicle, a hydraulic motor is attached to the auxiliary wheel, and the hydraulic motor is rotated in forward and reverse directions to move the vehicle laterally. For example, there is one shown in Japanese Utility Model Application Publication No. 50-38234.

A partially enlarged view of the auxiliary wheel device in the above publication is shown in FIG. 6, and a hydraulic circuit of the auxiliary wheel device is shown in FIG. The PS closed hydraulic circuit consisting of the directional control valve 2 and the steering box 4 is switched to a PS closed hydraulic circuit communicating with the cylinder 7 by switching the directional control valve 2.

As a result, the sitter 7 moves the auxiliary wheels 9 up and down by expanding and contracting the rod 20 due to internal pressure changes.

[Problems solved by the invention]

However, in the case of an FF vehicle in which the auxiliary wheel device 9 is located on the rear wheel side and the drive wheels are always in contact with the ground, the auxiliary wheel device 9
If the driver forgets to store the auxiliary wheel device 9 and depresses the accelerator pedal while the auxiliary wheel device 9 is not retracted, a force is applied in a direction perpendicular to the rotational direction of the auxiliary wheel device, causing the support arm 17 or rod of the auxiliary wheel device 9 to 20 etc. are curved,
There is a risk of hindering the lifting and lowering operations.

In addition, in the case of a PR vehicle where the auxiliary wheel device 9 is on the rear wheel side, if the driver forgets to store the auxiliary wheel device 9 and depresses the accelerator pedal while the auxiliary wheel device 9 is not stored, the drive wheel There is a possibility of the engine idling and the engine speed increasing rapidly.

In view of the above problems, it is an object of the present invention to prevent the vehicle from starting when the auxiliary wheel device is lowered by giving priority to the auxiliary wheel storage operation over the vehicle starting.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention provides a vehicle in which it is possible to set a state in which the output shaft of the engine and the output shaft of the transmission device can transmit power, and a state in which the output shaft of the engine and the output shaft of the transmission device cannot transmit power. In this auxiliary wheel device, the auxiliary wheel device includes a lifting device M3 that is located at the front or rear of the vehicle and supports auxiliary wheels that move the vehicle in the lateral direction so that they can be raised and lowered in response to an external signal, from the state in which power cannot be transmitted. The present invention is characterized in that it includes a setting cancellation state detection means M1 that detects that the setting has been canceled, and a control device M2 that outputs a rising signal to the lifting device based on the output signal of the setting cancellation state detection means.

[Effect]

According to the above means, the control device M2 outputs a rise signal to the elevating device M3 based on the output signal of the setting release state detection means Ml that detects that the state in which power cannot be transmitted is released.

Based on this lift signal, the lifting device M3 raises the auxiliary wheels.

Therefore, the auxiliary wheel retracting operation is performed with priority over starting the vehicle.

(Example〕 An embodiment of the present invention will be described below with reference to the drawings.

The auxiliary wheel device 30 of this embodiment mainly includes an electronic control circuit 3
1, an elevating device 52, and a device for detecting a start preparation state, which will be described later. First, the elevating device 52 will be explained with reference to FIGS. 3 and 4.

This lifting device 52 includes an auxiliary wheel 60, a hydraulic cylinder 53,
It is composed of a rod 57, a hydraulic motor 58, and a support rod 62, and is installed at the center of the rear of the vehicle 50.

The upper end of the hydraulic cylinder 53 is connected to a shaft 6 extending in the longitudinal direction of the vehicle.
8 is rotatably supported at the bottom of the vehicle 50, and a rod 57 extends from the inside of the hydraulic cylinder 53 at the lower end.

The inside of the hydraulic cylinder 53 is separated by the upper end of the rod 57 into a first liquid chamber 54 connected to an oil passage 90 and a second liquid chamber 55 connected to an oil passage 91, as shown in FIG. A storage spring 56 is disposed in the second liquid chamber 55, and urges the rod 57 toward the first liquid chamber 54.

The upper end of the support rod 62 is connected to a shaft 66 extending in the longitudinal direction of the vehicle.
Therefore, it is rotatably supported on the bottom of the vehicle 50, and a hydraulic motor 58 and auxiliary wheels 60 are fixed to the lower end.

Furthermore, the auxiliary wheel 60 is connected to the rotation shaft 5 of the hydraulic motor 58.
9, it is configured to move to the side of the vehicle 50.

The vicinity of the center of the support rod 62 is rotatably fixed to the lower end of the rod 57 extending from the lower end of the hydraulic cylinder 53 by a shaft 64 extending in the longitudinal direction of the vehicle.

The above hydraulic cylinder 53, rod 57, and support rod 62
In this configuration, when the auxiliary wheel 60 or the rear wheel of the vehicle 50 is raised, the first liquid chamber 54 of the hydraulic cylinder 53 is opened by the weight of the vehicle 50 and the force of the storage spring 56 (to be described later) urging the rod 57. When the oil pressure suddenly decreases, the support rod 62 supports the vehicle 50 with the shaft 66 as a fulcrum.
It has a shape and rigidity that allows it to be moved all the way to the bottom.

Note that the hydraulic motor 58 is connected to an oil passage 96 consisting of a hydraulic vibrator.
．． 97, and the illustration and detailed explanation of the specific structure of the hydraulic motor 58 will be omitted since it is a well-known structure.

FIG. 2 is a circuit diagram showing the entire auxiliary wheel device according to the embodiment of the present invention.

The auxiliary wheel device 30 of this embodiment includes a PS servo valve 72
This configuration uses a PS pump 70 for supplying oil to the engine, and the directional control valve 71 is switched to 71a by an output signal from a microcomputer 38, which will be described later.

In normal running conditions, the directional control valve 71 is connected to the PS pump 70 which is driven by the driving force.
Accordingly, oil is transferred from the oil reservoir 74 to the oil passage 79.
．． It is supplied to the PS servo valve 72 via 80 and 82.

The PS servo valve 72 is equipped with a hydraulic reaction force mechanism disclosed in Japanese Utility Model Application Publication No. 63-32070.

The hydraulic reaction force mechanism generates hydraulic pressure when the steering wheel is turned, and the hydraulic pressure is sent to the power cylinder 73 through oil passages 83 and 84, thereby moving the wheels in the direction in which the steering wheel is turned. is steered.

When the directional control valve 71 is switched to 71a by an output signal from the microcomputer 38, which will be described later, the PS
The oil passage 80 communicating with the oil supply side of the pump 700 communicates with an oil passage 81 and is cut off from communication with the supply oil passage 82 to the power steering circuit 72.

The oil passage 81 is connected to the oil passage 90 via the one-way valve 75.
It communicates with the first liquid chamber 54 of the hydraulic cylinder 53.

Note that the one-way valve 75 is connected to the first liquid chamber 5 of the hydraulic cylinder 53.
This prevents backflow of oil to the pump 70 and damage when the pressure of the engine 4 suddenly increases due to an external force or the like, and when the engine rotation is stopped with the auxiliary wheels (described later) being lowered and the wheels being raised.

The oil passage 90 branches into an oil passage 92 to the hydraulic motor 58 side and an oil passage 86 to the oil reservoir 74 side.

The oil passage 92 is connected to the pressure control valve 76 and further includes:
Only when the pressure in the oil passage 90 exceeds the set pressure, the pressure control valve 76 opens and communicates with the oil passage 93.

The oil passage 93 communicates with an electromagnetic switching valve 78 via an oil passage 94 via a fixed throttle 77 that reduces pump pulsation.

The electromagnetic switching valve 78 operates according to an output signal from the microcomputer 38, which will be described later.
78 by exciting the solenoid coils placed at both ends of 8.
A, 78b, or 78c. Normally, the position of the electromagnetic switching valve 78 is 78 when the solenoid coil is not energized.
b, and the oil passage 94 and oil passage 95 are in communication with each other.

When the solenoid coil on the 78a side is energized by the output signal from the microcomputer, 78a of the electromagnetic switching valve 78 moves to the neutral position, and when the solenoid on the 78c side is energized, the 78a of the electromagnetic switching valve 78 moves to the neutral position.
8c moves to the neutral position, and the oil passage 94 is switched.

When the electromagnetic switching valve 78 is set to 78a, oil is supplied from the oil passage 97 to the hydraulic motor 58.
After rotating, the oil is returned to the oil reservoir 74 via oil passage 96, oil passage 95, and oil passage 91.

Note that as the hydraulic motor 58 rotates, the auxiliary wheels 60
Rotate in the clockwise direction in FIG.

When the electromagnetic switching valve 78 is set to 78c, oil is supplied from the oil path 96 to the hydraulic motor 58 and is then connected to the hydraulic motor 5B.
After rotating, the oil is returned to the oil reservoir 74 via oil passage 97, oil passage 95, and oil passage 91.

Note that as the hydraulic motor 58 rotates, the auxiliary wheels 60
Rotate counterclockwise in FIG.

When the electromagnetic switching valve 78 is 78b, the oil passage 94 is
Since the oil is returned to the oil reservoir 74 via the oil path 95 and the oil path 91, oil is not supplied to the hydraulic motor 5B, and the hydraulic motor 58 does not rotate.

Note that an oil passage 91 connected to the second liquid chamber 55 of the hydraulic cylinder 53 drains leaked oil from the first liquid chamber to an oil reservoir 74.
It is meant to return to.

Furthermore, the oil passage 86 branched from the oil passage 90 is returned to the oil reservoir 74, and the flow of oil is restricted by a leaf valve 98 and a direction switching valve 99 that are connected and arranged in parallel in the middle of the oil passage 86. .

The leaf valve 98 is activated by the pressure increase in the oil passage 86a.
Only when the pressure difference between the oil passage 86 and the oil passage 87 becomes higher than the set pressure, the oil passage 86 and the oil passage 87 are provided with a mechanism that communicates with each other, and the hydraulic circuit such as the hydraulic cylinder 54 and the oil passage 90.86 is damage is prevented.

Note that the set pressure of the leaf valve 98 is a larger value than the set pressure of the relief valve 76 described above.

The direction switching valve 99 is switched to either 99a or 99b in response to an output signal from a microcomputer 38, which will be described later, to shut off or communicate with the oil passage 88.

Next, regarding the electronic control circuit 31 of the auxiliary wheel device 30, the sensors (33b, 33c) that detect when the output shaft of the engine and the output shaft of the transmission are released from the power transmission disabled state (start preparation state). Give an explanation.

The electronic control circuit 31 includes a microcomputer 38, an auxiliary wheel rotation direction sensor 33a that inputs information to the microcomputer 38, a stop lamp SW33d, an auxiliary wheel operation switch (SWl), an auxiliary wheel lift switch (SW2), and a stop lamp SW33d.
).

Note that illustration of the specific configuration of each switch and each sensor is omitted.

Sensors that detect the start preparation state include a clutch pedal sensor 33b and a shift position sensor 33c.

The auxiliary wheel rotation direction sensor 33a detects whether the auxiliary wheel operation switch (SWI) installed in the driver's seat is in a command position (R) for moving the vehicle 50 to the right, a command position (L) for moving the vehicle 50 to the left, or an OFF command. It detects the position and outputs according to the operating state.

The clutch pedal sensor 33b detects whether or not the clutch pedal installed in the driver's seat is used to disconnect the clutch disk from the flywheel that transmits the driving force of the engine. A switch is installed to indirectly detect the connection state between the flywheel and clutch disc.

The shift position sensor 33c detects whether or not the sleeve connected to the shift fork of the transmission is moved toward the drive gear from the neutral state by the shift lever.

The stop lamp SW33d detects a brake operation, replaces the presence or absence of a brake operation with an output signal, and outputs the signal.

Each of these sensors and each switch is connected to a microcomputer 38.

The microcomputer 38 includes a ROM 38b and a CPU 38c, each connected to a bus 38a.

It consists of a RAM 38d, an input interface 38e, and an output interface 38f.

The ROM 38b stores a program corresponding to the flowchart in FIG. 5, the CPU 38c executes the program, and the RAM 38d temporarily stores variables necessary for the program. The input interface 38e is for inputting each signal from each sensor and each switch. In addition, the output interface 38
f outputs various control signals to the outside, and is connected to the output interface 38f to the directional switching valve 71, the electromagnetic switching valve 78, and the directional switching valve 99.

Next, the operation of the embodiment configured as described above will be explained according to the flowchart shown in FIG.

First, when the ignition switch is turned on in step l (hereinafter referred to as S1, and abbreviations are used in other steps as well), the CPU 38c starts executing the program, and the RAM 38d, input and output interfaces 38e, 38f After initializing the above, the processes from S2 onwards are repeatedly executed.

In this case, both the directional switching valves 71 and 99 and the electromagnetic switching valve 78 are not controlled to be energized, so the directional switching valve 71 is connected to 71b, and the PS pump is connected to the oil on the PS servo valve 72 side. The directional control valve 71.99 is in the state of the directional control valve 99a1 and the electromagnetic control valve 78b.

In G2, the detection signal detected by the clutch pedal sensor 33b and the shift position detected and outputted by the shift position sensor 33C are read or read from the RAM 38. recorded in d.

In addition, the input interface 38e reads the switching state of the auxiliary wheel operation switch SWL and auxiliary wheel lift switch SW2 operated by the driver, and the input interface 38e also stores the switching state of the auxiliary wheel operating switch SWL and the auxiliary wheel elevation switch SW2.
The flag G1 and flag F are set and confirmed.

The flag G consists of three types, 0.1.2, and is set corresponding to the three types of switching means (OFFSR, L) of the operated auxiliary wheel operation switch SWI. Depending on the set value, three types of command currents are set for switching the electromagnetic switching valve 78, which will be described later, to a corresponding switching position.

In addition, the flag F consists of two types of 0.1, and two types of switching means (
OFF, ON), and depending on the setting of each flag, the direction switching valve 71.99 described later
Two types of corresponding command currents are set for switching the switch to the corresponding switching position.

Next, at 83, set the auxiliary wheel lift switch SW2 to 0N10.
FF is confirmed using flag F.

When flag F is larger than 0 (auxiliary wheel lift switch SW
2 ON), it is judged as YES and proceeds to G4, and when it is not large (auxiliary wheel lift switch SW20FF), it is judged as NO.
It is determined that this is the case, and the process proceeds to S17.

In G4, it is determined whether the operating state of the clutch pedal stored in the RAM 38d in G2 has been depressed;
If it is stepped on, it is judged as YES, that is, it is judged to be ready for departure, and the process proceeds to SI4. Otherwise, it is judged as N.
Judging as O, we can move on to G5.

In G5, it is determined whether the shift position stored in the RAM 38 d in G2 is neutral or not. If NO, it is determined that the vehicle is ready to start, and the process proceeds to SI4; otherwise, it is determined YES. It will advance to G6.

In G6, each command current value is commanded from the output interface 38f to the directional control valve 71.99 based on the flag F stored in the RAM 38d in G2, and then in S7
You can proceed to

In response to this command, the directional control valve 71 is switched to 71a, the supply of oil from the PS pump 70 to the power steering device is cut off, and the oil passage 80 and the oil passage 81 are communicated with each other.

Further, the directional switching valve 99 is switched to 99b, and the flow of oil between the oil passage 86 and the oil passage 88 is blocked.

As described above, the oil discharged from the PS pump 70 increases the pressure inside the oil passages 86, 90, 92 and the first liquid chamber 54 of the hydraulic cylinder 53.

Therefore, by moving toward the second liquid chamber 55 against the elastic force of the rod 57 or the storage spring 56, the support rod 62 rotates around the shaft 66 and lowers the auxiliary wheel 60 to the road surface. Furthermore, by rotating the support rod 62, the vehicle 5o is lifted up.

After the lowering of the auxiliary wheels 60 is completed, that is, after the rear wheels of the vehicle 50 are raised, the pressure in the oil passage 92a becomes equal to or higher than the set valve opening pressure.

Therefore, the pressure control valve 76 opens and closes depending on the pressure in the oil passage 92a, and the oil flows out to the oil passages 93, 94, and 95.

In S7, it is determined whether or not the flag G is greater than 0, that is, whether the auxiliary wheel operation switch SWI is in the ON state (R or L). When the flag G is greater than 0, If YES is determined, the process proceeds to S8, and if NO, the process returns to S2 and the steps after S2 are executed.

In S8, it is determined whether the flag G is smaller than 2, that is, it is determined whether the auxiliary wheel operation switch SWI is in the R or L state. When the flag G is small, YES (R
), the process proceeds to S9, and if No (L), the process proceeds to SIO.

In S9, based on the command current setting value of flag G=1, the command current is outputted from the output interface 38f to the electromagnetic switching valve 78 and switched to the electromagnetic switching valve 78c, and the process proceeds to S11.

By switching the electromagnetic switching valve 78c, the hydraulic motor 58 rotates clockwise in FIG. 3 and operates the auxiliary wheels 60, thereby moving the rear of the vehicle 50 to the right.

In SIO, based on the command current setting value of flag G=2, the command current is output from the output interface 38f to the electromagnetic switching valve 78, which is switched to the electromagnetic switching valve 78a, and the process proceeds to S11.

By switching the electromagnetic switching valve 78a, the hydraulic motor 58 rotates counterclockwise in FIG. 3, operating the auxiliary wheels 60 and moving the rear of the vehicle 50 to the left.

In Sll, a judgment is made as to whether or not a brake signal has been detected by the foot brake sensor 33d. If YES, the process advances to S12; if NO, the process returns to S2,
Steps after S2 are executed.

In S12, the auxiliary wheel operation switch SWI is forcibly released, the flag G is set to 0, and the process proceeds to S13.

In S13, the command current to the electromagnetic switching valve 78 is stopped, so that the electromagnetic switching valve is switched to 78b, and the process returns to S2, and the steps after S2 are executed. .

Note that the execution of S13 forcibly stops the rotation of the hydraulic motor 58 and stops the vehicle 50 from moving rearward and laterally.

After S2 to S7 or Sll are executed, when the auxiliary wheel lift switch SW2 is turned OFF and the flag F is set, or when S2 to 813 are executed, etc. , the process proceeds to step 317 in the same manner as the NO determination in S3 described above, and in S17, the directional control valve 71 is
．． A command is issued to set the command current to 99 to O, and the process proceeds to 318.

As a result, the directional switching valves become 71b and 99a, and the oil passages 86, 90, 92 and the first liquid chamber 54 of the hydraulic cylinder 53 communicate with the oil reservoir 74 via the oil passage 88, and the PS pump 70. Be cut off.

Therefore, when the auxiliary wheel is in the lowered state, the first liquid chamber 5
4 decreases and rises due to the elastic force of the storage spring 56 and the weight of the vehicle 50, and is stored.

Next, in S14, which is proceeded by a determination of YES (start preparation state) in S4 or a determination of No (start preparation state) in S5, it is checked whether the flag F is smaller than 1. If it is 0, then 31 with a YES judgment.
If the answer is NO, the process proceeds to S15.

In S15, the flag F is set to 0 and the auxiliary wheel lift switch SW2 is forcibly released, and the process proceeds to S16.

In S16, a command to set the command current to the directional control valve 71.99 to 0 is executed, and the process proceeds to S18.

As a result, the directional switching valves become 71b and 99a, and the oil passages 86, 90, 92 and the first liquid chamber 54 of the hydraulic cylinder 53 communicate with the oil reservoir 74 via the oil passage 88, and the PS pump 70. Be cut off.

Therefore, when the auxiliary wheel is in the lowered state, the first liquid chamber 5
4 decreases and rises due to the elastic force of the storage spring 56 and the weight of the vehicle 50, and is stored.

Therefore, when the auxiliary wheels are lowered, transmission of power to the drive wheels is avoided.

In S18, it is determined whether or not the flag G is greater than 0. If it is larger, that is, YES, the process proceeds to S19, and if NO, the process proceeds to S20.

At step 319, the flag G is set to 0 and the auxiliary wheel operation switch SWI is forcibly released, and the process proceeds to S20.

In S20, the command current to the electromagnetic switching valve 78 is set to 0, the process returns to return, and the steps after S2 are executed.

In addition, in the embodiment of the present invention, the vehicle with a manual transmission is targeted, and the detection means for detecting the start preparation state is set in duplicate, so that even if an abnormality occurs in the detected value of one of the start preparation states, , the auxiliary wheel is raised by the other detection means, and in the present invention, either one of the detection means may be used.

Additionally, in the case of a vehicle with an automatic transmission, the output shaft of the engine and the output shaft of the automatic transmission are always engaged due to fluid coupling, so for example, when the transmission is released from the N or P range, The start preparation state may be detected by a range sensor and used.

Further, as means for detecting the start preparation state, a touch sensor may be used, which detects when the driver's hand touches the shift lever and determines the start preparation state.

Furthermore, in this embodiment, as a device for separating the auxiliary wheel from the road surface, a means for reducing the pressure in the first liquid chamber 54 of the hydraulic cylinder 53 by means of a direction switching valve 99, and a means for lowering the pressure in the first liquid chamber 54 of the hydraulic cylinder 53, and a means for lowering the pressure of the auxiliary wheel by the elastic force of the storage spring 56 are used. Although the elevating device 52 has a rod 57 that indirectly supports the auxiliary wheels, the present invention is not limited to this embodiment. Rotate the electric motor according to
A support member that supports the auxiliary wheel may be raised via a gear.

〔Effect of the invention〕

According to the present invention, the auxiliary wheels are raised by the control device outputting a lift signal to the lifting device based on the output signal of the setting cancellation state detection means that detects that the power transmission is not possible. .

Therefore, for example, even if the driver performs a shift lever switching operation or clutch operation while the vehicle is lifted up by the training wheels, the training wheels will be retracted with priority over starting the vehicle. .

[Brief explanation of drawings]

FIG. 1 is a block diagram conceptually showing the configuration of the present invention. FIG. 2 is a circuit diagram showing the entire auxiliary wheel device according to an embodiment of the present invention. FIG. 3 is a rear view showing one way in which the auxiliary wheel device is used in a vehicle. FIG. 4 is a left side view showing one way in which the auxiliary wheel device is used in a vehicle. FIG. 5 is a flowchart of a program executed by the microcomputer shown in FIG. FIG. 6 is a partially enlarged perspective view of a conventional auxiliary wheel device. FIG. 7 is a hydraulic circuit diagram of the prior art. Explanation of symbols 30: Auxiliary wheel device, 31: Electronic control circuit, 33: Sensor 33a: Auxiliary wheel rotation direction sensor 33b = Clutch pedal sensor 33c/shift position sensor 33d: Foot brake sensor 38 2. Microcomputer 38a; Bus, 38b: ROM, 38c: CPU3
8d: RAM 38e: Input interface 38f: Output interface 50: Vehicle, 52. Lifting device, 53. Hydraulic cylinder, 5
4: First liquid chamber, 55: Second liquid chamber 56: Storage spring, 57: Rod 58: Hydraulic motor, 59: Rotating shaft 60/auxiliary wheel, 62: Support rod 64.66.68: Shaft 71 (71a, 71b): Directional switching valve 74: Oil reservoir 78 (78a, 78b, 78c): Electromagnetic switching valve, 79-97: Oil passage 99 (99a, 99b): Directional switching valve WI Auxiliary wheel operation switch W2 Auxiliary wheel elevation switch

Claims (1)

[Scope of Claims] A vehicle capable of setting a state in which the output shaft of the engine and the output shaft of the transmission device can transmit power and a state in which the output shaft of the engine and the output shaft of the transmission device cannot transmit power, the vehicle In an auxiliary wheel device that is located at the front or rear of a vehicle and includes an elevating device that supports auxiliary wheels that move the vehicle laterally so that they can be raised and lowered in response to an external signal, it is detected that the power transmission is disabled. An auxiliary wheel device comprising: a setting release state detection means; and a control device that outputs a rising signal to the lifting device based on an output signal of the setting release state detection means.