A vehicle drive unit control system. The vehicle includes a prime mover arranged on a power transmission route from a continuously variable transmission to a wheel, a clutch mechanism arranged on a first route from the prime mover to the wheel, and a shift range or shift position can be shifted sele
A vehicle drive unit control system. The vehicle includes a prime mover arranged on a power transmission route from a continuously variable transmission to a wheel, a clutch mechanism arranged on a first route from the prime mover to the wheel, and a shift range or shift position can be shifted selectively between a drive range or drive position where a power can be transmitted through the first route and a non-drive range or non-drive position where a power cannot be transmitted through the first route. The control system includes a vehicle speed control demand judging mechanism judging a vehicle speed control demand in case of shifting the shift range or shift position from the non-drive range or non-drive position to the drive range or drive position; and a prime mover controller controlling torque of the prime mover based on the judged vehicle speed control demand.
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1. A control system for a drive unit of a vehicle, in which a prime mover is arranged on a power transmission route from a continuously variable transmission to a wheel, in which a clutch mechanism is arranged on a route from the prime mover to the wheel, and in which a shift range or shift position
1. A control system for a drive unit of a vehicle, in which a prime mover is arranged on a power transmission route from a continuously variable transmission to a wheel, in which a clutch mechanism is arranged on a route from the prime mover to the wheel, and in which a shift range or shift position of a shifting device can be shifted selectively between a drive range or drive position where a motive power can be transmitted through the route from the prime mover to the wheel and a non-drive range or non-drive position where a motive power cannot be transmitted through the route from the prime mover to the wheel, comprising: a vehicle speed control demand judging means for judging a vehicle speed control demand in case of shifting the shift range or shift position of the shifting device from the non-drive range or non-drive position to the drive range or drive position; anda prime mover control means for controlling a torque of the prime mover on the basis of a judgment of the vehicle speed control demand judging means, whereinthe vehicle speed control demand judging means includes a means for judging a braking demand,the prime mover control means includes a means for increasing a torque of the prime mover, and a means for changing a timing of increasing the torque of the prime mover depending on an existence of the braking demand, andthe prime mover control means includes a means for accelerating the timing of increasing the torque of the prime mover in case the braking demand is not being outputted, in comparison with the timing of the case in which the braking demand is being outputted. 2. The control system for a drive unit of a vehicle as claimed in claim 1, wherein: a second prime mover is connected to an input side of the continuously variable transmission. 3. The control system for a drive unit of a vehicle as claimed in claim 2: wherein the continuously variable transmission comprises an input element connected with the second prime mover, a reaction element connected with a reaction force establishing device, and an output element connected with the prime mover in a power transmittable manner, and those elements are capable of rotating differentially among each other;wherein a speed change ratio of the continuously variable transmission is varied steplessly by controlling an output of the reaction force establishing device; andcomprising a transmission in which a gear stage thereof is controlled by controlling a torque capacity of the clutch mechanism. 4. The control system for a drive unit of a vehicle as claimed in claim 3, wherein the vehicle speed control demand judging means includes a means for judging an acceleration demand on the basis of an opening degree of an accelerator, the control system further comprising: a revolution frequency control means for controlling a revolution frequency of the prime mover in accordance with the opening degree of the accelerator in case the opening degree of the accelerator is increased prior to shifting the shift range or shift position of the shifting device from the non-drive range or non-drive position to the drive range or drive position;a first torque control means for controlling the torque of the prime mover for the drive range or drive position in accordance with the opening degree of the accelerator, in case the shift range or shift position of the shifting device is shifted from the non-drive range or non-drive position to the drive range or drive position; anda torque capacity control means for controlling a torque capacity of the clutch mechanism for the drive range or drive position in accordance with the opening degree of the accelerator, in case the shift range or shift position of the shifting device is shifted from the non-drive range or non-drive position to the drive range or drive position. 5. The control system for a drive unit of a vehicle as claimed claim 4, further comprising: a prime mover starting means for starting the second prime mover in case the opening degree of the accelerator is increased prior to shifting the shift range or shift position of the shifting device from the non-drive range or non-drive position to the drive range or drive position, and controlling the revolution frequency of the prime mover. 6. The control system for a drive unit of a vehicle as claimed in claim 4, wherein: the revolution frequency control means includes a means for controlling a revolution frequency of the prime mover in accordance with the opening degree of the accelerator. 7. The control system for a drive unit of a vehicle as claimed in claim 6, wherein: the revolution frequency control means includes a means for controlling a revolution frequency of the second prime mover in accordance with the opening degree of the accelerator. 8. The control system for a drive unit of a vehicle as claimed in claim 5, wherein: the prime mover starting means includes a means for keeping the revolution frequency of the second prime mover in accordance with the revolution frequencies of the prime mover and the second prime mover, lower than an upper limit guard value for preventing a rise in the revolution frequency of the prime mover. 9. The control system for a drive unit of a vehicle as claimed in claim 5: wherein the prime mover starting means includes a means for controlling the revolution frequency of the second prime mover by controlling an output of the second prime mover; andfurther comprising a second torque control means for controlling a torque of the reaction force establishing device to a minimum value during a period from a commencement to a termination of a shifting operation of the shifting device from the non-drive range or non-drive position to the drive range or drive position. 10. The control system for a drive unit of a vehicle as claimed in claim 1, wherein: the vehicle speed control demand judging means further includes a means for judging the vehicle speed control demand in accordance with an opening degree of an accelerator or the braking demand. 11. The control system for a drive unit of a vehicle as claimed in claim 1, wherein: the prime mover control means includes a means for raising the torque of the prime mover gradually. 12. The control system for a drive unit of a vehicle as claimed in claim 1, wherein: the vehicle speed control demand judging means includes a means for judging the vehicle speed control demand wherein the timing of the judgment is at least one of:before a shifting operation of the shift range or shift position of the shifting device from the non-drive range or non-drive position to the drive range or drive position;during the shifting operation; andafter a completion of the shifting operation. 13. The control system for a drive unit of a vehicle as claimed in claim 1, wherein: a transmission is arranged on a power transmission route from the prime mover to the wheel;the continuously variable transmission includes an electrical continuously variable transmission, in which a speed change ratio thereof is controlled electrically and steplessly; andthe transmission includes a geared transmission, in which a gear stage thereof is changed stepwise. 14. The control system for a drive unit of a vehicle as claimed in claim 13, wherein: the electrical continuously variable transmission and the geared transmission are connected in tandem so as to input power outputted from any one of those transmissions to the other one. 15. The control system for a drive unit of a vehicle as claimed in claim 13, wherein: a total speed change ratio of the drive unit is set by both of the electrical continuously variable transmission and the geared transmission. 16. The control system for a drive unit of a vehicle as claimed in claim 13, wherein: the electrical continuously variable transmission includes a single pinion type planetary gear mechanism comprising a carrier functioning as an input element, a sun gear functioning as a reaction element, and a ring gear functioning an output element. 17. The control system for a drive unit of a vehicle as claimed in claim 13, wherein: the transmission comprises two sets of planetary gear mechanisms and a plurality of engagement devices; andthe clutch mechanism includes a plurality of engagement devices. 18. The control system for a drive unit of a vehicle as claimed in claim 17, wherein: the two sets of planetary gear mechanisms include a single pinion type planetary gear mechanism;the sun gears of a first and a second planetary gear mechanisms are connected with each other, and the carrier of the first planetary gear mechanism and the ring gear of the second planetary gear mechanism are connected with each other; andthe engagement device comprises a first clutch connecting the ring gear of the first planetary gear mechanism with the output element of the power distribution mechanism selectively,a second clutch connecting the sun gear of the first planetary gear mechanism and the sun gear of the second planetary gear mechanism with the output element of the power distribution mechanism selectively;a first brake fixing the sun gears of the first and the second planetary gear mechanisms selectively, anda second brake fixing the carrier of the second planetary gear mechanisms selectively. 19. A control method for a drive unit of a vehicle, in which a prime mover is arranged on a power transmission route from a continuously variable transmission to a wheel, in which a clutch mechanism is arranged on a route from the prime mover to the wheel, and in which a shift range or shift position of a shifting device can be shifted selectively between a drive range or drive position where a motive power can be transmitted through the route from the prime mover to the wheel and a non-drive range or non-drive position where a motive power cannot be transmitted through the route from the prime mover to the wheel, the method comprising: judging a vehicle speed control demand in case of shifting the shift range or shift position of the shifting device from the non-drive range or non-drive position to the drive range or drive position;judging a braking demand; andcontrolling a torque of the prime mover on the basis of the judging the vehicle speed control demand, including changing a timing of increasing the torque of the prime mover depending on an existence of the braking demand, and accelerating the timing of increasing the torque of the prime mover in case the braking demand is not being outputted, in comparison with the timing of the case in which the braking demand is being outputted. 20. A control system for a drive unit of a vehicle, in which a prime mover is arranged on a power transmission route from a continuously variable transmission to a wheel, in which a clutch mechanism is arranged on a route from the prime mover to the wheel, and in which a shift range or shift position of a shifting device can be shifted selectively between a drive range or drive position where a motive power can be transmitted through the route from the prime mover to the wheel and a non-drive range or non-drive position where a motive power cannot be transmitted through the route from the prime mover to the wheel, comprising: a vehicle speed control demand judging device for judging a vehicle speed control demand in case of shifting the shift range or shift position of the shifting device from the non-drive range or non-drive position to the drive range or drive position; anda prime mover control device for controlling a torque of the prime mover on the basis of a judgment of the vehicle speed control demand judging device, whereinthe vehicle speed control demand judging device includes a controller to determine a braking demand,the prime mover control device includes a controller to increase a torque of the prime mover, and a controller to change a timing of increasing the torque of the prime mover depending on an existence of the braking demand, andthe prime mover control device includes a controller to accelerate the timing of increasing the torque of the prime mover in case the braking demand is not being outputted, in comparison with the timing of the case in which the braking demand is being outputted. 21. The control system for a drive unit of a vehicle as claimed in claim 1, wherein: the means for accelerating the timing of increasing the torque of the prime mover increases a rate at which the torque of the prime mover is increased in the case the braking demand is not being outputted, in comparison with a rate at which the torque of the prime mover is increased in the case the braking demand is being outputted.
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이 특허에 인용된 특허 (6)
Sakakibara Shiro (Anjo JPX) Kume Akihiro (Aichi JPX), Apparatus for controlling a continuously variable transmission.
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