JPH0641251B2 - Torque distribution display device for four-wheel drive vehicle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Use) The present invention visually displays the torque distribution state of a four-wheel drive vehicle in which the torque distribution of the front and rear wheels can be changed according to the driving state. Torque distribution display device.

(Prior Art) A four-wheel drive vehicle is known in which the torque distribution between the front wheels and the rear wheels can be changed. For example,
Japanese Unexamined Patent Publication No. 58-20521 discloses a structure of a transmission of a four-wheel drive vehicle in which a power transmission amount of front and rear wheels, that is, a torque distribution ratio is changed when the vehicle turns.

(Problems to be solved) However, in the vehicle in which the torque distribution of the front and rear wheels can be changed in this way, when the torque distribution is changed,
Since a great change occurs in the running characteristics of the vehicle, running the vehicle not corresponding to the change in the torque distribution may not only reduce the running performance but also may not obtain good running performance. Therefore, the driver needs to grasp such a change in the torque distribution quickly and accurately.

(Means for Solving the Above Problems) In view of the above circumstances, the present invention allows the driver to quickly and accurately know the change in the torque distribution of the front and rear wheels, thereby making the four wheels with higher safety. An object of the present invention is to provide a torque distribution display device capable of ensuring traveling in a driving vehicle.

The present invention includes a detection unit that detects a traveling state of a vehicle, a control unit that receives information from the detection unit, calculates a torque distribution to wheels, and outputs a torque distribution signal from the calculation result; A distribution conversion actuator that controls torque distribution to wheels according to a signal, and a torque distribution display unit that visually displays torque distribution to wheels controlled by the actuator in response to a calculation result of the control unit. It is characterized by that.

(Description of Embodiments) Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a wheel drive system of a four-wheel drive vehicle according to the present invention. The front wheels 1 are connected to each other by a front axle 3 via a front differential gear 2 (hereinafter referred to as front differential). Further, the rear wheels 4 are connected to each other by a rear axle 6 via a rear differential gear 5 (hereinafter referred to as rear differential). Further, an engine 7 is mounted in a substantially central portion between the two front wheels 1 and slightly forward of the two axles 3 and 6, and a transmission 8 is connected to the rear side of the engine 7. ing. In the vehicle of this example, a center differential gear (hereinafter referred to as center differential) is connected to the rear side of the transmission 8. The center diff 9 is connected to the rear diff 5 via the rear wheel drive shaft 10 on the one hand, and is connected to the front diff 2 via the front wheel drive shaft 11 on the other hand. Further, in the vehicle of this example, the engine power transmitted to the center differential 9 via the transmission 8 is controlled to control the power distribution transmitted to the front differential 2 and the rear differential 5, that is, the torque distribution. can do.
In order to control the center differential 9, in this example, the controller 1 preferably composed of a microcomputer
Two are provided. The controller 12 includes the wheels 1, 4 for detecting the slip ratios of the front and rear wheels.
Signals are input from a slip rate sensor 13 attached to the vehicle, a G sensor 14 that detects longitudinal force and lateral force acting on the vehicle, and a vehicle speed sensor 15 that detects a vehicle speed. The center differential 9 of this example uses both automatic control in which the torque distribution ratio to the front and rear wheels is automatically controlled according to a command signal from the controller, and manual control in which the torque distribution ratio is determined by means. It can be controlled. The manual control and the automatic control can be selected by operating the changeover switch 16, and the signal from the changeover switch 16 is also input to the controller 12. Controller 1
In the case of automatic control, 2 outputs a distribution ratio control signal to the center differential 9 so that the torque distribution ratio according to the content of the manual control can be obtained by the signal from the changeover switch 16. The input signal from the sensor is calculated and a predetermined torque distribution ratio signal is output to the center differential 9. The center differential 9 responds to the torque distribution ratio signal from the controller 12 by the engine 7
Power is distributed according to the torque distribution ratio and transmitted to the front differential 2 and the rear differential 5. The front diff 2 and the rear diff 5 transmit the respective torque distribution amounts distributed by the center diff 9 as a driving force of each wheel so as to have an inverse ratio of the running resistance of the wheel. In the vehicle of this example,
The same signal as the torque distribution signal output from the controller 12 to the center differential 9 is input to the display unit 17 that displays the distribution ratio, and the display unit 17 responds to this signal to the front and rear wheels. The amount of torque distribution is displayed. In the present example, as shown in FIG. 2, the display unit 17 schematically shows wheels and a drive system, and the front wheel 17b to the rear wheel 1 in the schematic diagram are shown beside the schematic diagram 17a.
A scale portion 17d extending over 7c is provided. And
An indicator 17e indicating the torque distribution amount is combined with the scale portion 17d. The indicator 17e is a scale portion 17d according to the torque distribution signal from the controller 12.
The driver can visually recognize the torque distribution amount from the position of the indicator 17e. That is, when the indicator 17e is deviated to the front wheel 17b of the schematic diagram 17a, the distribution amount to the front differential 2 is large, and when the indicator 17e is located to the rear wheel 17c side, the torque distribution amount to the rear differential 5 is large. Indicates that there are many. The contents of the torque distribution control and display control of this example will be described with reference to FIG.

The controller 12 receives signals from the sensors such as the vehicle speed sensor 15, the slip ratio sensor 13, the G sensor 14, and the switching switch 16 for switching between manual and automatic. When the automatic control is performed by the signal from the switching switch 16, the controller 12 calculates the signals from the respective sensors to calculate the ground speed, the tire slip rate, the yaw change rate, etc., and based on these results, the front wheels And the torque distribution ratio to the rear wheels is determined. When performing manual control, the torque distribution ratio is determined according to the manual operation. Then, the distribution signal based on the determined distribution ratio is sent to the center differential 9
Output to an actuator (not shown). The actuator of the center differential 9 generates a hydraulic pressure having a magnitude corresponding to the distribution signal, whereby the center differential 9 operates to transmit the engine power to the front and rear wheels at a distribution ratio according to the signal.

On the other hand, the distribution signal from the controller 12 is displayed on the display unit 17
Is also input to the display unit 17, and the display unit 17 displays the distribution amount according to the distribution ratio to the center differential 9.

Note that FIG. 4 shows another type of display unit 17 ', and the display unit 17' schematically shows the front wheels 17a and the rear wheels 17b ', depending on the torque distribution amount. , The colors of the wheels 17a ', 17b' are partially changed. Therefore, the driver is
The amount of torque distribution can be known at a glance by the size of the color changing regions of a'and 17b '.

Further, FIG. 5 shows a display unit 17 ″ of another type, and this display diagram has a scale portion 17a ″ provided at the center of the wheel, which is schematically shown, and is similar to the previous example. In addition, the torque distribution amount is displayed by changing the size of the colored portion area.

(Effect of the Invention) According to the present invention, in a four-wheel drive vehicle, the torque distribution ratio of the front and rear wheels is visually displayed, so that the driver can quickly and accurately know the torque distribution ratio. be able to. Therefore, the driver can always perform driving in accordance with the torque distribution ratio, so that traveling safety can be ensured and excellent traveling performance corresponding to the torque distribution ratio can be exhibited.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a drive system of a four-wheel drive vehicle according to the present invention, FIG. 2 is a plan view showing an example of a display unit according to one embodiment of the present invention, and FIG. Control system diagram according to
FIG. 4 is a plan view of a display unit of another type according to the present invention, and FIG. 5 is a plan view of a display unit of another type according to the present invention. 1 ... front wheel, 2 ... front differential, 3 ... front axle, 4 ... rear wheel, 5 ... rear differential, 7 ... engine, 8 ... transmission, 9 ... center differential.

Claims (1)

[Claims] 1. A detection unit for detecting a running state of a vehicle, a control unit for receiving information from the detection unit, calculating torque distribution to wheels, and outputting a torque distribution signal from the calculation result, and the control unit. A distribution conversion actuator that controls the torque distribution to the wheels in accordance with the signal of, and a torque distribution display unit that visually displays the torque distribution to the wheels controlled by the actuator in response to the calculation result of the control unit. A torque distribution display device for a four-wheel drive vehicle, comprising: