摘要:
A control apparatus of an automatic transmission has an engagement part, a power-ON/OFF state judgment section and a control section controlling a capacity of the engagement part. The control section compares an actual input revolution speed difference absolute value of an absolute value of a difference between an input revolution speed when engaged and an actual input revolution speed with a target input revolution speed difference absolute value of an absolute value of a difference between the input revolution speed when engaged and a target input revolution speed, then a deviation is determined by subtracting the target input revolution speed difference absolute value from the actual input revolution speed difference absolute value. When the deviation is positive, the capacity is increased. When the deviation is negative, the capacity is reduced. When the deviation is zero, a previous capacity that is set before the comparison of the both absolute values is maintained.
摘要:
In control apparatus and method for an automatic transmission, a gear shift state of a stepwise variable transmission mechanism is controlled to a target gear shift state by releasing a first engagement section according to a reduction in a capacity of the first engagement section and, simultaneously, by engaging a second engagement section according to an increase in the capacity of the second engagement section, in accordance with a torque inputted to the stepwise variable transmission mechanism and, during an inertia phase, either one of the first and second engagement sections functions as a gear shift state control side engagement section and the capacity of a gear shift state non-control side engagement section which is the other engagement section is increased when determining that it is impossible to make the gear shift state follow up the target gear shift state at the gear shift state control side engagement section.
摘要:
A control apparatus for an automatic transmission includes a stepwise variable transmission mechanism; a power ON/OFF state judging section; and a shift control section configured to control the stepwise variable transmission mechanism to a target rotational speed by disengaging the first engagement portion and engaging the second engagement portion in accordance with a torque inputted to the stepwise variable transmission mechanism, the shift control section being configured to engage one of the first engagement portion and the second engagement portion which has a function to suppress a variation of an input rotational speed of the stepwise variable transmission mechanism which is generated by a switching of the power ON/OFF state when the power ON/OFF state is switched at the shift control of the stepwise variable transmission mechanism, and to disengage the other of the first engagement portion and the second engagement portion.
摘要:
After an engine (1) has started, a controller (6) starts determining whether lockup should be prohibited or permitted based on the cooling water temperature of an engine (1) or the oil temperature of a transmission (2). Once it has been determined that lockup should be permitted, the controller (6) stops determining whether lockup should be prohibited or permitted until the next time the engine (1) is started. In this way, once the conditions for determining that lockup should be permitted hold, lockup prohibition or permission based on the engine cooling water temperature or transmission oil temperature is no longer determined, so repeat engaging and disengaging of the lockup clutch (5) due to fluctuations of engine cooling water temperature or transmission oil temperature, is prevented.
摘要:
After an engine (1) has started, a controller (6) starts determining whether lockup should be prohibited or permitted based on the cooling water temperature of an engine (1) or the oil temperature of a transmission (2). Once it has been determined that lockup should be permitted, the controller (6) stops determining whether lockup should be prohibited or permitted until the next time the engine (1) is started. In this way, once the conditions for determining that lockup should be permitted hold, lockup prohibition or permission based on the engine cooling water temperature or transmission oil temperature is no longer determined, so repeat engaging and disengaging of the lockup clutch (5) due to fluctuations of engine cooling water temperature or transmission oil temperature, is prevented.
摘要:
A control device for controlling a continuously variable transmission (5) is disclosed. The control device has an oil pressure control unit (100) which supplies an oil pressure to a primary pulley (10) and secondary pulley (11) based on a command signal indicative of a target speed-reduction ratio, a sensor (26) which detects a rotation speed ( Np1 ) of the primary pulley (26), and a controller (20) which transmits the command signal indicative of the target speed-reduction ratio to the oil pressure control unit (100). The controller is programmed to set the target speed-reduction ratio to a first speed-reduction ratio ( R1 ); calculate a first predetermined rotation speed ( N1 ) of the primary pulley at which the V-belt reaches a first limiting temperature ( T1 ) at the first speed-reduction ratio ( R1 ); calculate a first elapsed time after the detected rotation speed ( Np1 ) of the primary pulley exceeds the first predetermined rotation speed ( N1 ); maintain the first speed-reduction ratio ( R1 ) when the first elapsed time is equal to or less than a first predetermined time; and set the target speed-reduction ratio to a second speed-reduction ratio ( R2 ) smaller than the first speed-reduction ratio ( R1 ) when the first elapsed time exceeds the first predetermined time. At the second speed-reduction ratio ( R2 ), the temperature of the V-belt should become equal to or less than the first limiting temperature ( T1 ) throughout the permitted rotation speed region of the primary pulley. Thus, starting acceleration performance of the continuously variable transmission is enhanced.
摘要:
There are provided with a determination means for determining whether or not the correlation between the pressure value detected by the primary pressure sensor (114) and the pressure value detected by the secondary pressure sensor (115) is an actually impossible relation (Step 5), and a switchover means for switching over to an open control while prohibiting a feedback control when the correlation is determined to have become a relation actually impossible by the determination means (Step 6). Presence or absence of a fault to the primary pressure sensor (114) or the secondary pressure sensor (115) (particularly, fault of fixed output voltage) is judged based on the correlation between the output voltage of the primary pressure sensor (114) and the output voltage of the secondary pressure sensor (115) to prohibit the control of a primary pressure and a secondary pressure using the hydraulic pressure sensors when it is judged that there is a fault.
摘要:
The controller has a feedback control unit that determines whether or not a correlation between pressures from two pressure sensors that are supplied to a cylinder chamber of two drive pulleys is actually an impossible relation. A ratio change control valve is provided to switchover to open control while preventing feedback if the correlation is actually the impossible relation showing a fault of fixed output voltage. An independent claim is also included for a method of controlling a transmission controller of a v-belt type continuously variable automatic transmission.
摘要:
A speed change ratio control unit (101) for a continuously variable transmission that uses a step motor (105) as a driving actuator of a speed change control valve (106) comprising a step-out determination means that compares a variable (ASTP) representing a step position of the step motor (105) and a step position (BSTP) of the step motor (105) that is necessary for realizing a desired speed change ratio at every predetermined operation cycle, and if ASTP≠BSTP is satisfied determines that a step-out has occurred on the step motor (105); a step-out correction means (S17d,S17f) that when a step-out is determined by the step-out determination means (S17b) corrects the ASTP so as to reduce a difference between the ASTP and the BSTP; and a drive means for driving the step motor (105) using the corrected ASTP . The speed change ratio control unit (101) for a continuously variable transmission is provided that can detect and correct a step-out at any speed change ratio.