JP2511028Y2 - Mode display device for four-wheel steering vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a mode display device for a four-wheel steering vehicle.

[Prior Art] Various four-wheel steering vehicles are known (for example, Japanese Patent Laid-Open No. 62-199).
The present applicant has proposed a technique for performing mode switching safely and surely in Japanese Patent Application No. 63-110621.

In a four-wheel steering vehicle in which a mechanical mode switching device is switched by electronic control or the like, the mode display lamp built in the mode switching switch whose mode is fixed is turned on, and the mode display lamp during mode switching blinks. Are displayed.

However, since the mode display lamps other than the above-mentioned lighting or blinking are off, there is a problem that the position of the mode changeover switch incorporating the mode display lamp is difficult to understand at night.

Generally, it is well known to provide a switch for switching the steering mode in a four-wheel steering vehicle, for example, the actual opening sho 62-807.
It is disclosed in Japanese Patent Publication No. 59. However, as mentioned above,
With such a known technique, it is difficult to know the position of the mode changeover switch which is turned off at night.

Further, Japanese Utility Model Laid-Open No. 57-61733 discloses a technique of lighting an indicator lamp provided in a preset operation button at two levels of brightness. However, in the case of an automobile, the lighting switch is always turned on to drive the vehicle at night, so the brightness must be controlled in association with the lighting switch, and the above-mentioned known technique cannot be applied.

[Problem to be Solved by the Invention] Therefore, an object of the present invention is to provide a mode display device for a four-wheel steering vehicle in which the position of the mode changeover switch can be easily confirmed in association with the lighting switch at night.

[Means for Solving the Problems] According to the present invention, the steering mode changeover switches (53, 54,
In a mode display device for a four-wheel steering vehicle having a mode display lamp (53a, 54a, 55a) built in 55), each mode display lamp (53a, 53a, 53a, 54a, 55a) are provided with a plurality of lighting circuits (C), and each lighting circuit (C) includes a first resistor (R1) connected between the drive circuit (20a) and the base of the transistor (Tr). ) And a second transistor connected between the collector of the transistor (Tr) and the indicator lamp.
Resistor (R2) and a third resistor (R3) connected between the base of the transistor (Tr) and ground, the emitter of the transistor (Tr) is grounded, and the lighting switch (12). Is connected to each mode indicator lamp (53a, 54a, 55a) through the dimming circuit (C4),
The dimming circuit (C4) includes a transistor (Tr1) whose base is connected to a lighting switch (12) via a fourth resistor (R4), a base of the transistor (Tr1) and a fourth transistor (Tr1).
A fifth resistor (R5) and a zener diode (2D), which are connected in parallel with the resistor (R4) of
A transistor (Tr1), a diode (D) and a sixth resistor (R6) connected in series between the collector and each mode display lamp (53a, 54a, 55a),
The emitter of the transistor (Tr1) is grounded.

Furthermore, according to the present invention, a lighting blinking circuit (C5) is provided for dimming the brightness of the mode indicator lamp which is lighting and blinking, and the lighting blinking circuit (C5) is provided with the drive circuit (20a) and the lighting circuit. One is connected to the circuit (L6) branched from between (C) and the other is the transistor (Tr) of the dimming circuit (C4).
1) An AND circuit (IC) connected to the circuit (L7) connected to the collector, the output side of which is connected to the base of the transistor (Tr2) via the seventh resistor (R7). The collector of the transistor (Tr2) is connected to the emitter of the transistor (Tr) of the lighting circuit (C), is grounded through the eighth resistor, and is connected to the seventh resistor (R7) and the transistor (Tr7). The base of Tr2) is grounded via the ninth resistor (R9).

[Explanation of Operation and Effect] Therefore, when the lighting switch is not turned on, when a signal is output from the drive circuit, the signal is applied to the base of the transistor of the lighting circuit, so that current flows in the mode display lamp. Lights up.

When the lighting switch is turned on, a voltage is applied to the base of the transistor of the dimming circuit, and each mode display lamp flows from the collector of the transistor to the emitter through the sixth resistor and the diode, and thus is lit darkly. At that time, if there is an output from the drive circuit, the lighting circuit having the output has the second resistor, and therefore the mode indicating lamps corresponding to the lighting circuit are connected in parallel to each other and the second resistor and the sixth resistor are connected. Since it is grounded through the resistor, it lights up brighter than other mode display lamps.

Therefore, when it is bright in the daytime, that is, when the lighting switch is off, only the mode display lamp connected to the lighting circuit output from the drive circuit lights up, and the other mode display lamps do not light up.

And when you turn on the lighting switch at night,
When there is no output from the drive circuit, each mode display lamp is lit dark by the dimming circuit, but when there is an output from the drive circuit, the mode display lamp connected to the lighting circuit lights up brighter.

Therefore, the position of the mode display lamp and the current mode can be surely known at night.

Further, if a lighting dimming circuit is provided, when the lighting switch is off, only the mode display lamp connected to the lighting circuit output from the drive circuit is lit as in the above case. When the lighting switch is turned on, the output of the AND circuit disappears, so that the mode display lamp connected to the lighting circuit having no output from the drive circuit has a sixth and sixth resistors connected in series with the second and eighth resistors connected in series. Since the current flows through the resistor, the eighth resistor is darker than in the above case. Therefore, in this example, it is possible to prevent the visibility from being too bright at night.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, one end of a front pitman arm 23 of a gear box 22 fixed to a frame and connected to a steering wheel 21 has a front drag link.
Connected to the front steering arm 25 via 24,
The front tie rod arm 26 formed integrally with the front steering arm 25 is connected to the front tie rod arm 26 on the other side via the front tie rod 27.

The other end of the front pickman arm 23 is
The idler link 28 and the first idler lever 29 are connected to the input side of a mode switching gear box 50 fixed to the frame. The output side of the mode switching gearbox 50 is a torque tube bracket fixed to the frame.
It is connected to one end of a torque tube 31 rotatably supported by 30. A rear pitman arm 33 is fixed to the other end of the torque tube 31, and the rear pitman arm 33 is pivotally mounted via a rear pitman link 34 to an actuator bracket 36 whose one end is fixed to the frame. It is connected to the steering actuator 35. The other end of the rear steering actuator 35 is connected to the middle of a second idler lever 38 pivotally attached to a second idler lever bracket 37 fixed to the frame, and the end portion of the second idler lever 38 is a rear drag. Link 39
Is connected to the rear steering arm 40 via.
The rear tie rod arm 41 formed integrally with the rear steering arm 40 is connected to the rear tie rod arm 41 on the other side via a rear tie rod 42.

In the mode switching gear box 50, an input side bevel gear and an output side bevel gear having a diameter larger than that of the bevel gear are provided on the same axis, and a planetary gear that meshes with these bevel gears is connected to the input side bevel gear via a gear arm. It is rotatably supported on the shaft part of. Further, there is provided a mode switching actuator 51 including a mode switching in-phase actuator that operates a clutch that connects and disconnects both bevel gears, and a mode switching anti-phase actuator that locks rotation of the gear arm.

With this configuration, in the in-phase mode of four-wheel steering (4WS), the mode switching in-phase actuator is extended and the clutch is moved to connect both bevel gears. Therefore, the rotation of the first idler lever 29 is directly transmitted from the rear pitman arm 33 to the rear wheels, and the in-phase steering angle characteristic in which the front wheel steering angle and the rear wheel steering angle are equal is obtained.

In the reverse phase mode, the clutch is disengaged to extend the mode switching reverse phase actuator to fix the gear arm and lock the rotation. Therefore, the rotation of the first idler lever 29 is transmitted from the input side bevel gear to the output side bevel gear having a diameter larger than that of the input side bevel gear through the planetary gear in a backward and decelerated manner, and the rear wheel steering angle is greater than the front wheel steering angle. A small reverse phase mode characteristic can be obtained.

For two-wheel steering (2WS), both actuators are turned off,
One of the rear steering systems is fixed by a neutral lock device according to a known technique to lock the rear wheels in a neutral position.

The mode-changing reverse-phase actuator, the reverse-phase mode switching valve 15 for operating the same-phase actuator, and the common-mode switching valve 16 are connected to a pneumatic pressure source A, and the air source A is locked via a lock release valve 14. The release air cylinder 1 is connected. Further, the rear steering actuator 35 is connected to the hydraulic power source B.

The mode switching actuator 51 is provided with an in-phase position sensor 3, a 2WS position sensor 4 and an anti-phase position sensor 5, each of which is a control unit.
Connected to 20.

The control unit 20 includes first and second lock sensors 6 and 7 provided on the unlocking air cylinder 1.
A first vehicle speed sensor 10, a lighting switch 12, and a display unit 52 provided in a transmission (not shown) are connected to each other.

In FIG. 2, the display section 52 has a reverse-phase mode changeover switch 53, each of which has a built-in mode lamp indicated by the subscript a.
2WS mode switch 54 and in-phase mode switch 5
Five are provided.

In FIG. 3, the drive circuit of the control unit 20
Mode lamps 54a, 53a and 55a are connected to 20a via lighting circuits C ₁ , C ₂ and C ₃ (hereinafter, reference numeral C is used) by circuits L ₁ , L ₂ and L ₃ . .

To the lighting circuit C, a resistor R ₁ , a transistor Tr and a resistor R ₂ are connected in series from the drive circuit 20a side. The base of the transistor Tr is connected to the resistor R ₁ , the collector is connected to the resistor R ₂ , the emitter is grounded, and the transistor Tr and the resistor R ₁ are grounded via the resistor R ₃ . .

On the other hand, the lighting switch 12 and the mode lamps 53a-5
A dimming circuit C ₄ is provided between the light source and 5a. In the dimming circuit C ₄ , a resistor R ₄ and a transistor Tr ₁ are connected in series on the circuit L ₄ from the switch 12 side. The base of the transistor Tr ₁ is connected to the resistor R ₄ , and the collector is a diode D and a resistor by a circuit L ₅ branched into three paths.
It is connected between the resistor R _{2 of} each of the circuits L _{1 to} L ₃ and the mode lamp via R ₆ , the emitter is grounded, and the resistor R ₄
And between the transistor Tr ₁ is parallel resistor R _5, consists Zener diode ZD, a voltage drop circuit to drop the voltage of the write power supply circuit (not shown) to the signal voltage to the base is provided.

Therefore, when the lighting switch 12 is OFF and a lighting drive signal is output from the driving circuit 20a to, for example, the lighting circuit C ₁ , the transistor Tr is turned ON and the 2WS mode lamp 54a is lit (state of FIG. 4). I and 5
Figure).

Here, when the lighting switch 12 is turned on, the transistor Tr ₁ is turned on, and the anti-phase mode lamp 53a and the common-mode lamp 55a of the resistor R ₆ are darker than the 2WS mode lamp 54a of the resistors R ₆ and R _{2 in} parallel. (State II and FIG. 6 in FIG. 4).

FIG. 7 shows another embodiment of the present invention, in which a lighting dimming circuit C ₅ for dimming the brightness of a mode lamp that is lighting or blinking is provided, and the other parts are configured in the same manner as in FIG. . That is connected to one input of the AND circuit IC~IC to each branched branch circuit L ₆ from between the lighting circuit C and the driving circuit 20a of the circuit L ₁ ~L _3, the circuit and the other input L ₇ By transistor
Connected in parallel to the collector side of Tr ₁ , and connect the output side of the AND circuit IC with the circuit L ₈ via the resistor R _7.
Connected to the base of Tr _2, grounding the emitter of the transistor Tr _2, while its collector connected to the emitter of the transistor Tr, and grounded through a resistor 8, between the resistor 7 and the transistor Tr ₂ via the resistor 9 Grounded. In this embodiment, when the lighting switch 12 is OFF and a lighting drive signal is output from the driving circuit 20a to the lighting circuit C ₁ , for example, the transistor Tr ₁ is OFF, and therefore the output of the AND circuit IC causes the transistors Tr and Tr to be turned on. ₂ is turned on and the 2WS mode lamp 54a is turned on (state I and FIG. 9 in FIG. 8).
Figure).

When the lighting switch 12 is turned on, the other mode lamps 53a and 55a are dimmed and turned on in the above embodiment, but the brightness of the 2WS mode lamp 54a being turned on is increased. On the other hand, in the present embodiment, the output of the AND circuit IC disappears when the transistor Tr ₁ is turned on, and the current of the 2WS mode lamp 54a is the series resistances R ₂ and R ₈ and the resistance in parallel with these resistances.
R ₆ and currents of the other mode lamps 53a and 55a respectively flow through the resistor R ₆ . Therefore, the other mode lamps 53a and 55a are dimmed and turned on as in the above embodiment (eighth
The 2WS mode lamp 54a is dimmed by the amount of the resistance R ₈ as compared with the above-described embodiment (state II and FIG. 10 in the figure) (state Ia and FIG. 10 in FIG. 8). It is possible to select the resistance value of the resistor R ₈ so that the brightness of the mode lamp can be identified in the daytime and prevent the visibility from being too bright at night.

[Effect of the Invention] As described above, the present invention has the above excellent effects.

(I) Only the mode display lamps connected to the lighting circuit output from the drive circuit are turned on when the lighting switch is off in the daytime, and all mode display lamps are turned on when the lighting switch is turned on at night, and the light is emitted from the drive circuit. Those connected to the lighting circuit will illuminate brightly, so
It is always easy to know which mode is being steered.

(Ii) When the lighting switch is turned on, all the mode display lamps are turned on, so the position of the mode switch can be clarified.

(Iii) Therefore, the operability of the four-wheel steering vehicle can be improved.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a four-wheel steering vehicle equipped with a mode display device embodying the present invention, FIG. 2 is a front view of a display unit, FIG. 3 is an electric circuit diagram, and FIG. 4 is an operation explanatory diagram. 5 and 6
FIG. 7 is a drawing for explaining a lighting state when the lighting switch is OFF and ON, and FIGS. 7, 8, 9 and 10 show another embodiment of the present invention. 5 and 6
It is a drawing corresponding to the figure. 12 …… Lighting switch, 20 …… Control unit, 20a …… Drive circuit, 53 …… Reverse-phase mode selector switch, 53a …… Reverse-phase mode lamp, 54 …… 2WS mode lamp, 54a …… 2WS mode lamp, 55 …… Common mode switch, C _{1 to} C ₃ …… Lighting circuit, C ₄ …… Dimmer circuit, C ₅ …… Lighting dimming circuit

Claims (2)

(57) [Scope of utility model registration request] 1. A drive circuit (20a) of a control unit (20) in a mode display device for a four-wheel steering vehicle, wherein a mode display lamp (53a, 54a, 55a) is built in a steering mode changeover switch (53, 54, 55). ) Is provided with a plurality of lighting circuits (C) for lighting each of the mode indicating lamps (53a, 54a, 55a) by a driving signal from the driving circuit (20a) to the transistor (Tr). A first resistor (R1) connected between the base and its transistor (Tr)
And a third resistor (R3) connected between the base of the transistor (Tr) and the ground, and a second resistor (R2) connected between the collector and the indicator lamp of the transistor (Tr). The emitter is grounded, and the lighting switch (12) is connected to each mode indicator lamp (53a, 54a, 55a) through the dimming circuit (C4), and the dimming circuit (C4) is lighting. A transistor (Tr1) whose base is connected to the switch (12) through a fourth resistor (R4); and a transistor (Tr1) connected in parallel between the base and the fourth resistor (R4). Grounded fifth resistor (R5) and Zener diode (2D), collector of transistor (Tr1) and each mode indicator lamp (5
3a, 54a, 55a) and a diode (D) and a sixth resistor (R6) respectively connected in series, and the emitter of the transistor (Tr1) is grounded. Mode display device for steered vehicles. 2. A lighting and blinking circuit (C5) for dimming the brightness of a mode indicator lamp that is lighting and blinking, and the lighting and blinking circuit (C5) is provided with the drive circuit (20a) and the lighting circuit (C). ) And an AND circuit (IC) connected to the circuit (L7) connected to the collector of the transistor (Tr1) of the dimming circuit (C4) and the other to the circuit (L6) branched from The output side of the AND circuit (IC) is connected to the base of the transistor (Tr2) through the seventh resistor (R7), and the collector of the transistor (Tr2) is the transistor (Tr) of the lighting circuit (C). It is connected to the emitter of and is grounded through the eighth resistor, and the seventh resistor (R7), the transistor (Tr2) and the base are grounded through the ninth resistor (R9). A mode display device for a four-wheel steering vehicle according to claim 1.