Abstract:
The invention relates to a method for adapting the clutch characteristics in a twin-clutch system (PSG) which comprises in a first train a first clutch (A) and a first partial transmission (iA) mounted downstream thereof, and in a second train a second clutch (B) and a partial transmission (iB) mounted downstream thereof. The first and the second train can be linked on the input side with a driving engine (M) and on the output side with the wheels of a vehicle. The first clutch (A) is actuated by a first clutch actuating mechanism (KA) and the second clutch (B) is actuated by a second clutch actuating mechanism (KB). A zero adjustment of the hodometry of the first and/or second clutch actuating mechanism (KA; KB) is carried out according to a predetermined strategy subject to predetermined criteria.
Abstract:
PROBLEM TO BE SOLVED: To provide a transmission system utilizing multiple sets of clutch friction elements each engaged to transfer torque from a torque input, such as an engine, to different gear ratios. SOLUTION: The sets of clutch friction elements are operated simultaneously to provide a composite gear ratio to a driving system. By varying engagement of the clutch elements, the proportion of the torque transferred to the gear ratio associated with each set of friction elements is varied and thus an intermediate effective gear ratio is developed. This effective gear ratio can be increased or decreased, in response to external stimuli such as a vehicle and/or an engine sensor, by modifying the degree of engagement of each set of clutch friction elements, and changing the proportion of torque transferred by each set of elements to its associated gear ratio. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
The invention relates to a counter shaft type transmission equipped with a pair of transmission gear trains (12-17, 26-31), the input shaft (11) of the first gear train (12-17) is connected with the engine (1) and that of the second gear train (26-31) is connected with the engine via a motor (5), the torque of the first gear train (12-17) is shifted onto the second gear train (26-31) for a while by means of the motor (5), and gear change in the first gear train (12-17) is accomplished during the time. By setting the gear ratio of the second gear train (26-31) to a half-position of gear ratio of the first gear train (12-17), motor capacity and battery capacity can be reduced and, because no clutch is needed, an economic transmission can be realized. Besides, by active transmission by means of the motor (5), torque transfer transmission becomes possible for both up-shift and down-shift. Furthermore, jump shift that has not been available in a prior art becomes possible and, since continuous ratio can be achieved, drivability of an automobile improves.
Abstract:
PROBLEM TO BE SOLVED: To provide a shift control device for a multi-stage automatic transmission for preventing joint shock by setting the joint capacity of a clutch to be an optimum value during shift. SOLUTION: The shift control device for the twin-clutch type multi-stage automatic transmission comprises an accelerator opening detecting means for detecting an accelerator opening and a shift control means formed so that a limiting value is set for the joint force of a first or second clutch when the detected accelerator opening is a preset value or smaller. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a change gear control device of a multistep automatic transmission wherein response delay is prevented from occurring at shifting gear. SOLUTION: The gear shift control device of the multistage automatic transmission of a twin clutch type is provided with a gear shift commanding means, a gear shift commanding output means and a pre-shift motion detecting means. The gear shift control device performs a pre-shift motion for shifting from a gear shift step of transmitting a driving torque via a first clutch or a second clutch to another gear shift step of connecting a shift clutch corresponding to other gear shift step connecting the other clutch not transmitting the torque based on a gear shift motion starting command from the pre-shift motion detecting means, disconnects the clutch transmitting the driving torque based on the gear shift command from the gear shift command output means, and connects the other clutch not transmitting the driving torque so as to shift gear. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To prevent shocks by smoothly coupling a clutch when the effective gear ratio reaches the gear ratio after the speed change, and exceeds the gear ratio in the reverse direction. SOLUTION: In the coupling control of a coupling side clutch C2 to be concurrently performed with reduction of the coupling force TC1 of an uncoupling side clutch C1 at the uncoupling lamp gradient α, the coupling force TC2 of the clutch C2 is increased at the lamp gradient β in the input side rotation-changing area between t1 and t2 in which the engine speed Ne as the input side number of rotation of the coupling side clutch C2 approaches the number of rotation of the clutch (C2) after the speed change corresponding to the gear ratio after the speed change. The feedback control quantity to match the slip ratio SLIP of the clutch C2 with a target value (a) is added thereto. In the input side rotation-converging area between t2 and t3 in which Ne is converged after exceeding the number of rotation of the clutch (C2) after speed change, the clutch coupling force TC2 is increased at the lamp gradient γ, the feedback control quantity to match SLIP with the target slip ratio (b) is added thereto, and the latter feedback control gain is separately set from the former one to a different value. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
A control apparatus for an automatic transmission of twin clutch type, in which a skip downshift is executed with a light gearshift shock and in a short gearshifting time period. As illustrated in FIG. 1, after the release of a clutch C2, a command for switching over a synchro mechanism is issued at a time t3. When the r.p.m. NT of a turbine has reached the synchronous r.p.m. NT3 of the intermediate stage of the skip downshift, the oil pressure of a clutch C1 is raised in order that the rising rate of the turbine r.p.m. (speed) NT may become a predetermined value d/dt(NT1) or d/dt(NT2). Thereafter, the oil pressure of the clutch C1 is controlled in order that the turbine r.p.m. NT may maintain a value NT2 (synchronous r.p.m. of the lower speed stage of the skip downshift)+ DELTA NT4. After the completion of the switchover of the synchro mechanism, the oil pressure of the clutch C2 is gradually raised, and that of the clutch C1 is gradually lowered. Thus, the skip downshift in a power-ON state is executed.
Abstract:
A power transmission for a motor vehicle. The transmission includes a plurality of transmission ratio steps defined by pairs of gear carried on parallel shafts, and final output mechanisms for engaging desired transmission ratio steps. The final output mechanisms are operable for controlling the engagement of respective transmission ratio steps to minimize tractive force interruption by allowing rapid gear changes to be effected to reduce the times between shifts of gears. By sensing accelerator pedal position and vehicle speed a new transmission ratio step to be subsequently engaged can be pre-selected while an engaged gear remains engaged.