JPS59176118A - Switching control device for 4-wheel-drive car - Google Patents

Abstract

PURPOSE:To improve safety by providing a switching circuit in parallel to a microphone, voice recognition device, and a manual switch in a part-time type 4-wheel drive car and automatically switching the drive of 2 and 4 wheels through drivers' voice. CONSTITUTION:The command voice of a driver issued toward a microphone 42 is voice-recognized by a voice recognition device 43 and a switching circuit 44 is turned on or off depending upon 4-wheel drive or release. The solenoid 32 of a switching valve operates by the ON or OFF of the switching circuit 44. Consequently, oil is supplied to and extracted from a transfer clutch to make changeover between 2- and 4-wheel drive. Thus, the driver need not release his hand from the handle. As a result, switching can be carried out safely even on a slippy road and safety can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a 2.4-wheel drive system for part-time 4-wheel drive vehicles that normally have two-wheel drive using one of the front and rear wheels, but can run in four-wheel drive as needed. The present invention relates to a switching control device that performs switching electrically, and particularly relates to a switching control device that allows switching not only by manual switch operation but also by voice.

This type of one-wheel drive vehicle was developed by the applicant in JP-A-55-4.
Many proposals have already been made, such as in Publication No. 292, in which a switching clutch is provided between the front and rear wheel transmission systems, and switching between 2 and 4 wheel drive is performed by connecting this switching clutch. It has become.

By the way, as a switching control device in this case, the above-mentioned prior art and Japanese Utility Model Publication No. 53-167! i2tan, Jitsuko 53-2628
As shown in each publication No. 2, it has been proposed that a dog clutch such as a dog clutch is used as the switching clutch, and this clutch is operated mechanically with an operating lever. There are problems such as poor operability when there is a difference in rotation between the front and rear wheels. To solve this problem, a hydraulic clutch consisting of a wet multi-disc clutch is used as the switching clutch, and it is installed at the shift lever. (The applicant has proposed a system in which switching is performed electrically by operating a switch.

This switch operation method using a hydraulic clutch is very effective in terms of operability and various aspects of the ship's equipment, but even with this method, manual operation remains, and it is necessary to take one hand off the handle when operating it. must be operated. If it is necessary to switch to 4-wheel drive, for example, when it rains,
Road conditions such as snowy roads and sandy roads are likely to cause slips, and under these conditions it is necessary to operate the steering wheel particularly carefully, and it is not desirable to be forced to use the steering wheel with one hand, even if only temporarily.

In view of the problems with the operation method when switching to 2.4-wheel drive based on the conventional technology, the present invention makes it possible to switch while holding the steering wheel with both hands, and makes it possible to switch in road conditions where slipping is likely to occur. An object of the present invention is to provide a switching control device for a four-wheel drive vehicle that improves safety and the like when driving.

For this purpose, the device according to the invention is designed to automatically switch between 2 and 4 wheel drive using the driver's voice, using a microphone, a voice recognition device, and a switch circuit configured in parallel to the manual switch. This is an abstract that is organized as follows.

Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

First, the transmission system of an example of a four-wheel drive vehicle to which the present invention is applied will be explained with reference to FIG. The turbine shaft 3 is connected to a turbine shaft 3, and is configured to be transmitted to an automatic transmission 4 via the turbine shaft 3. The automatic transmission 4 includes a planetary gear 5 and a clutch 6 that selectively inputs the power of the turbine shaft 3 to an input element of a planetary gear A75.
．． 7, and a one-way clutch 8, a brake 9, and a brake hand 10 for selectively locking each element of the planetary gear 5, and the shifted power from the automatic transmission 4 is taken out forward by an output shaft 11, Reaction drive and driven gear 12゜13 and shaft 16
can be conveyed to.

Further, a front wheel final reduction device 14 is disposed in the lower part between the torque converter 2 and the automatic transmission 4, and a crown gear 15 of this device 14 is formed at one end of a shaft 16 integral with the gear j-13. By meshing the driven pinions 17, two-wheel drive running using the front wheels is achieved.

The other end of the shaft 1G is extended rearward by a transfer drive shaft 18 and connected to a transfer drive and driven gear 20, 21 of a transfer device 19 mounted at the rear of the automatic transmission 4. And this gear 21 is 21.
It is connected to a rear drive shaft 23 via a transfer clutch 22, which is a hydraulic clutch for switching four-wheel drive.
- Transmission is configured from the rear drive shaft 23 to the contact wheel final reduction gear [25] via the propeller shaft 24. In this way, when the clutch 22 is released by draining oil, power transmission to the rear wheels is cut off, and when it is engaged by refueling, power is further transmitted to the rear wheels, resulting in a state of four-wheel drive driving.

Next, the hydraulic control system of the clutch 22 will be explained. An oil pump 26, which is a hydraulic pressure source for the automatic transmission 4, controls the clutch 2 by an oil passage 28 having a switching valve 27 in the middle.
It is connected to 2. The switching valve 27 is the oil pump 2G
side inlet port 29, clutch 22 side outlet [J boat 3
0 and a drain port 31, and is configured to move the spool 34 depending on whether or not a solenoid 32 is energized and the action of a return spring 33. Therefore, if the solenoid 32 is de-energized, the entrance boat 29
closes, the outlet boat 30 communicates with the drain port 31, and the clutch 22 releases the oil by draining the oil. When the solenoid 1-32 is energized, the spool 34 moves to the left, the drain port 31 closes, and the outlet , enter[] boat 30,29
Through this communication, the clutch 22 is supplied with oil and engaged, thereby performing the above-mentioned 2.4 wheel drive switching.

To explain the electric control system in FIG. 2, there is a manual switching switch at the shift lever 35 of the automatic transmission 4.
The switch 36 is connected in series to the solenoid 32 of the switching valve 27, the ignition switch 37 and the battery 38, and the four-wheel drive indicator lamp 39 is connected in parallel to the solenoid 32. It is connected to the.

In the above configuration, as shown in FIG. 3, a microphone 42 is mounted on the driver's seat 41 of a vehicle 40 by hanging it from the ceiling. A switch circuit 44 consisting of a transistor and the like connected in parallel to the changeover switch 36 is connected to a voice recognition device 43 to turn it on and off. Voice recognition device 4
3, the driver identifies the voice input of "4WD" or "cancellation" when the driver lights up, and turns on the switch circuit 44 in the case of the voice of 4WD J, and reverses it in the case of the voice of "cancellation". The switch circuit 44 is configured to be turned off at the same time.

Because of this configuration, when the 2.4-wheel drive changeover switch 36 is turned off, the solenoid 32 of the changeover valve 27 is de-energized and drains the transfer clutch 22, so the clutch 22 is released. In this state, the U-turn from the automatic gear shift R4 is transmitted only to the front wheels by the front wheel final reduction device 14, and two-wheel drive driving is performed using the front wheels1.In this case, the indicator lamp 39 is turned off due to de-energization are doing.

On the other hand, when the switch 36 at the shift lever 35 is manually turned on, the switching valve 27 lubricates the clutch 22 by energizing the solenoid 32 and switches to engage. Power is rear wheel final reduction gear 2
5 also transmits the signal to the rear wheels, and in this way the front and rear wheels transmit 4
Wheel drive vehicles are used. In this case, the indicator lamp 39 is turned on by energization to notify the driver of this driving state.

Next, in the two-wheel drive state d'3, when the driver speaks into the microphone 42 the words "14WD", the voice recognition device 43 turns on the switch circuit 44 and turns on the switch 36. Switching valve 27 in the same way as when operated.
The solenoid 32 is energized and automatically switches to four-wheel drive. In this 4-wheel drive state, when the driver turns to the microphone 42 and speaks the word "cancellation", the switch circuit 44 switches to A) and the switching valve 27 is de-energized, causing the 2-wheel drive to be switched off. automatically return to.

As is clear from the above description, according to the present invention, 2.4
A transfer clutch 22 consisting of a hydraulic Clara f- is used to change the wheel drive, and a one-touch operation of a switch 36
．． In the switching control method for switching between 4-wheel drive, the driver can automatically switch between 2 and 4-wheel drive using his/her voice while holding the steering wheel with both hands, which further improves the operability of switching. It also improves safety when switching to four-wheel drive, especially in road conditions where slips are likely to occur.

[Brief explanation of drawings]

FIG. 1 is a skeleton diagram showing the transmission system of a four-wheel drive vehicle to which the present invention is applied, FIG. 4... automatic transmission, 14... front wheel final reduction gear, 22
...Transfer clutch, 25...Rear wheel final reduction gear, 27...Switching valve, 32...Solenoid, 3
6...Manual changeover switch, 42...Microphone, 43.
...Voice recognition device, 44...Switch circuit. Patent attorney representing Fuji Heavy Industries Co., Ltd.
Atsushi Kobashi

Claims (1)

[Scope of Claims] A four-wheel drive system in which power is directly transmitted to one of the front and rear wheels and, if necessary, the power is transmitted to the other of the front and rear wheels by engaging a transfoot clutch consisting of a hydraulic clutch. In a car, a switching valve is provided in the hydraulic system of the transfer clutch, a manual switching switch is provided in the electrical system of the solenoid of the switching valve, and a switch circuit connected in parallel to the switching switch is connected to a voice recognition device using voice input from a microphone. On via. 1. A switching control device for a four-wheel drive vehicle, characterized in that the circuit is configured so that the switch is turned off, and the switching between two and four wheel drives is automatically performed by voice.