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1. 发明专利

JPH02114023A CONTROL METHOD FOR DIFFERENTIAL CONTROL CLUTCH FOR FRONT /REAR WHEEL DRIVE VEHICLE 失效
公开(公告)号：JPH02114023A
公开(公告)日：1990-04-26
申请号：JP26669188
申请日：1988-10-21
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI
IPC分类号： B60K17/35 , B60K17/346 , B60K17/348
摘要： PURPOSE:To improve the steering stability during lane change running at a relatively high speed by controlling to increase the differential limiting force of a differential control clutch controlling the differential between front and rear wheels for a preset time when the car speed is the preset value or above and the steering angle of a steering device is the preset value or above. CONSTITUTION:The drive torque outputted from an automatic transmission 14 is divided into two by a center differential device 20 and transmitted to front wheels 24 via a front wheel differential device 22 and to rear wheels 28 via a rear wheel differential device 26 respectively. The center differential device 20 is provided with a differential control clutch 82 between a differential case 32 functioning as an input member and a front wheel drive shaft 44 functioning as an output member, and the torque distribution action of the center differential device 10 is limited as its differential limiting force is increased. When the differential control clutch 82 is controlled by an electronic controller 86 via a clutch hydraulic control circuit 84, the differential limiting force is increased for a preset time if the car speed is the preset value or above and the steering angle is the preset value or above.

2. 发明专利

JPH02106441A FRONT/REAR WHEEL DIFFERENTIAL MOVEMENT CONTROLLER FOR FOUR-WHEEL DRIVE VEHICLE 失效
公开(公告)号：JPH02106441A
公开(公告)日：1990-04-18
申请号：JP26110788
申请日：1988-10-17
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI , SATO TOSHIMITSU , KITAMURA TAKAMASA
IPC分类号： B60K17/35 , B60K17/346 , B60K17/348
摘要： PURPOSE:To secure the smooth traveling by reducing the differential movement restricting force for front and rear wheels close to zero when the state in which the possibility of the reduction of the input torque supplied into a transfer and the increase of the traveling resistance due to the application of the differential movement restricting force exists is judged. CONSTITUTION:The title device selects the differential state between front and rear wheels from the signal reflecting the vehicle traveling state, and even if the input torque supplied into a transfer for distributing the driving power into the front and rear wheels is small, a prescribed differential movement restricting force is applied. In this device, a detecting means A for detecting the above-described input torque, means B for judging the state in which the possibility of the increase of the traveling resistance due to the application of the differential movement restricting force exists, and a speed change detecting means C for detecting the generation of speed change are provided. When the state in which the possibility of the reduction of the input torque and the increase of the traveling resistance exists is judged, a controller D controls a differential control means E so that the differential movement restricting force is reduced to zero or close to zero, synchronized with the speed change.

3. 发明专利

JPH0260838A DIFFERENTIAL LIMITING DEVICE FOR FRONT AND REAR WHEELS OF FOUR WHEEL DRIVE VEHICLE 失效
公开(公告)号：JPH0260838A
公开(公告)日：1990-03-01
申请号：JP20997988
申请日：1988-08-24
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI NOBUAKI , NISHIKAWA SEIICHI
IPC分类号： B60K17/35 , B60K17/346
摘要： PURPOSE:To prevent frequent differential motion from being permitted by suspending the detection of the differential motive condition for front and rear wheels until the condition wherein vehicle speeds are less than a specified one close to zero is continued beyond the specified period of time when differential limiting at the time of high speed running is judged to have been permissible. CONSTITUTION:A front/rear wheel differential motive condition detecting means allows the differential motive condition for front and rear wheels to be detected when specified conditions are satisfied based on the result of the detection, it is judged by a judging means whether or not the differential limiting at the time of high speed running is permissible. And when the condition is judged to have been permissible, a suspension control means suspends the detection, judgement and execution of the differential motive condition for the front and rear wheels until the situation will happen thereafter wherein the differential motive condition for the front and rear wheels is possibly changed, that is, until the condition wherein vehicle speeds are less than a specified one close to zero, is continued beyond the specified period of time. This constitution prevents the frequent differential motive condition for the front and rear wheels from being permitted, thereby enabling a differential limiting means to be improved in durability.

4. 发明专利

JPH0257430A DEVICE FOR CONTROLLING DIFFERENTIAL MOTION BETWEEN FRONT /REAR WHEEL OF FOUR-WHEEL-DRIVE VEHICLE 失效
公开(公告)号：JPH0257430A
公开(公告)日：1990-02-27
申请号：JP20924288
申请日：1988-08-23
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI , FUKUMURA KAGENORI , NAKAMURA HIROYA , OZEKI TATSUYA
IPC分类号： B60K17/35 , B60K17/346 , B60K17/348
摘要： PURPOSE:To carry out smooth traveling in accordance with a traveling condition and prevent slippage by controlling the differential motion limiting force between front/rear wheels based on the input torque into a transfer, the increasing condition of traveling resistance of a vehicle accompanying the addition of differential motion limiting control, and the difference in rotating speed between front/rear wheels. CONSTITUTION:Input torque into a transfer for distributing driving force to front/rear wheels is detected by a means A. Also, it is judged whether there is a possibility of increasing the traveling resistance of a vehicle because of the application of differential motion limiting force by a means B. Further, the difference in rotating speed between front/rear wheels is detected by a means C. Based on the outputs of the means A-C, a differential motion control means E is controlled by a control device D. That is, when the input into the transfer is small while there is a possibility of increasing traveling resistance, the differential motion limiting force between front/rear wheels is reduced to zero or to the vicinity of zero. Also, even in a similar condition, when difference in rotating speed between front/rear wheels gets larger than a defined value, the differential motion limiting force between the front/rear wheels is increased.

5. 发明专利

JPH0237044A METHOD FOR CONTROLLING DIFFERENTIAL CONTROL CLUTCH FOR FRONT AND REAR WHEEL DRIVE VEHICLE 失效
公开(公告)号：JPH0237044A
公开(公告)日：1990-02-07
申请号：JP18895088
申请日：1988-07-28
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI , SATO TOSHIMITSU
IPC分类号： B60K17/35 , B60K17/346 , B60K17/348
摘要： PURPOSE:To improve the durability of a differential control clutch by deciding a time for executing opening operation for a time based on the total differential amount or total work amount in the clutch. CONSTITUTION:An engaging force in a differential control clutch 82 is read in; next, the differential amount between a front wheel 24 and rear wheel 28, i.e. the rotational speeds of both the wheels 24, 28 are read in; then a work amount DELTAE is calculated from functions stored preliminarily based on the engaging force and the differential amount, and this is accumulated by an accumulator. In lubricating the clutch 82, it is opened for a time at every time when the total work amount DELTAE reaches a judgement reference value specified preliminarily. As a result, the opening is made at an optimum frequency. It is thus possible to open the clutch 82 for a time at a sufficient interval so as to prevent occurrence of unnecessary opening operation of the clutch 82 or want of lubrication.

6. 发明专利

JPH0234432A DIFFERENTIAL CONTROL CLUTCH CONTROL METHOD FOR FRONT/ REAR WHEEL DRIVE CAR 失效
公开(公告)号：JPH0234432A
公开(公告)日：1990-02-05
申请号：JP18483388
申请日：1988-07-25
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI NOBUAKI , NISHIKAWA SEIICHI
IPC分类号： B60K17/35 , B60K17/346
摘要： PURPOSE:To eliminate excessive temporary disengagement and prevent drop in the durability of a hydraulic actuator by restricting temporary disengagement for lubrication within a certain period of time of once being disengaged in case a differential control clutch is disengaged temporarily for the purpose of performing its lubrication. CONSTITUTION:An electronic control device 86 controls a clutch hydraulic control circuit 84 of a differential control clutch 82 so as to increase the differential limiting force in accordance with the car driving force to be decided from the relation between the opening of the throttle valve, gear ratio, and engine revolving speed sensed by respective sensors 106, 108, 117. This differential control clutch 82 is disengaged temporarily every time specified conditions are met, and thus lubrication is conducted positively. Therein temporary disengagement for lubricating the differential control clutch 82 shall be restricted within a certain period of time after the clutch 82 is temporarily disengaged. Thereby excessive temporary disengagements of the clutch 82 are eliminated, which prevents drop in the durability of hydraulic actuator, etc.

7. 发明专利

JPH0231936A CONTROL METHOD FOR FRONT AND REAR WHEEL DIFFERENTIAL LIMITTING DEVICE 失效
公开(公告)号：JPH0231936A
公开(公告)日：1990-02-01
申请号：JP18263688
申请日：1988-07-21
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI , FUKUMURA KAGENORI
IPC分类号： B60K17/35 , B60K17/346
摘要： PURPOSE:To perform the optimal distribution of the driving force more quickly and exactly by previously changing the differential limitting force of front and rear wheels to the value corresponding to the driving force of after the change, when the driving force distributed to the front and rear wheels is changed. CONSTITUTION:When the driving force to be changed is judged, the differential limitting force corresponding to the driving force of after the change is found, and the control for setting this differential limitting force is firstly carried out. Thereafter, the control for changing the driving force is performed. Consequently, at the time when the driving force is changed, the differential limitting force is the value corresponding to the driving force of after the change so that the new driving force is quickly and optimally distributed to the front and rear wheels by the differential limitting force corresponding to this value.

8. 发明专利

JPH0231935A CONTROL METHOD FOR FRONT AND REAR WHEEL DIFFERENTIAL CONTROL CLUTCH 失效
公开(公告)号：JPH0231935A
公开(公告)日：1990-02-01
申请号：JP17867788
申请日：1988-07-18
申请人： TOYOTA MOTOR CORP
发明人： TAKAHASHI NOBUAKI , NISHIKAWA SEIICHI
IPC分类号： B60K17/35 , B60K17/346
摘要： PURPOSE:To improve the durability of a differential control clutch by judging the difference of the temperature of two parts at least, and forcedly reducing the slide of the clutch when the temperature of the clutch for controlling the differential of front and rear wheels rises, preceding to other part. CONSTITUTION:The temperature of two parts at least, the temperature T of a differential control clutch including a clutch for switchin two wheel drive four wheel drive or of the part substituting for it and the temperature T of the preset reference part, are detected. The compared value of the temperature (the difference of the temperature or the ratio of the temperature) of the two pats is compared with the preset value T1, and when the obtained compared value is more than the preset value T1, the clutch is controlled so as to reduce the slide of a friction plate of the clutch.

9. 发明专利

JPH0220451A CONTROL OF DIFFERENTIAL CONTROL CLUTCH FOR FRONT AND REAR WHEEL DRIVING VEHICLE 失效
公开(公告)号：JPH0220451A
公开(公告)日：1990-01-24
申请号：JP17115688
申请日：1988-07-09
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI , FUKUMURA KAGENORI , UCHIDA KIYOYUKI
IPC分类号： B60K17/35 , B60K17/346 , B60T8/1769 , B60T8/58
摘要： PURPOSE:To make highly accurate decision of the necessity or the unnecessity for the anti-skid control by reducing the differential restraint force of a differential control clutch before deciding the necessity or the unnecessity for the operation of an anti-skid controller. CONSTITUTION:A controller 86 regulates the pressure of braking oil sent to a wheel cylinder 124 via an anti-skid oil pressure control circuit 126 to make wheels slipped suitably, and also regulates the differential revolution speeds of front wheels 24 and rear wheels via a differential control clutch 82. Prior to deciding that the operation of the anti-skid control is necessary or unnecessary, the differential restraint force of the differential control clutch 82 is reduced via an oil pressure control circuit 84 and the revolution speeds of the front wheels 24 and the rear wheels 28 are detected accurately. Since the deceleration speed of the wheels is able to be obtained accurately, the highly reliable decision of the necessity or the unnecessity for the anti-skid control may be executed.

10. 发明专利

JPH0220439A FRONT AND REAR WHEEL DIFFERENTIAL CONTROLLER OF FOUR-WHEEL DRIVE VEHICLE 失效
公开(公告)号：JPH0220439A
公开(公告)日：1990-01-24
申请号：JP17020488
申请日：1988-07-08
申请人： TOYOTA MOTOR CORP
发明人： NISHIKAWA SEIICHI , TAKAHASHI NOBUAKI , KOJIMA MASAHIRO , KITAMURA TAKAMASA
IPC分类号： B60K17/35 , B60K17/346 , B60K17/348
摘要： PURPOSE:To improve the durability of both the differential control clutch and the hydraulic servo mechanism thereof by temporarily restraining the execution of the differential operation permission for the purpose of improvement of the lubricating characteristics when it is detected that the front and rear wheel differential operation is to be permitted for any other purpose. CONSTITUTION:A front and rear wheel differential controller restains the differential operation according to the vehicle driving state detected by a detecting means during all or almost running time, for example. However, since a differential control clutch is placed in the slipped state continuously for a long time and therefore the durability is reduced, the differential operation is permitted temporarily under the specified condition for the purpose of the lubrication characteristics. Furthermore, when the differential operation permission for the other purpose is detected according to the detected vehicle driving state signal, the execution of the temporary differential permission for the purpose of improving the lubricating characteristics is restrained. Thus the durability of the differential control clutch may be improved without any influence on the driving state of the vehicle.

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