摘要:
A hydraulic control apparatus of an automatic transmission having engagement pressure solenoid valves configured to regulate an engagement pressure supplied to a hydraulic servo of a frictional engagement element and to output the engagement pressures from a predetermined number of the engagement pressure solenoid valves to establish respective transmission gear speeds. The hydraulic control apparatus includes a simultaneous engagement signal switch valve configured to be switched from a non-output position where an output of a simultaneous engagement signal pressure is not produced to an output position where an output of the simultaneous engagement signal pressure is produced upon receipt of an input of the engagement pressures by a number larger than the predetermined number of valves; and an original pressure switch valve configured to be switched from a supply position where an original pressure is supplied to the engagement pressure solenoid valves to a blocked position where the original pressure is blocked upon receipt of an input of the simultaneous engagement signal pressure from the simultaneous engagement signal switch valve.
摘要:
A hydraulic control apparatus of an automatic transmission having engagement pressure solenoid valves configured to regulate an engagement pressure supplied to a hydraulic servo of a frictional engagement element and to output the engagement pressures from a predetermined number of the engagement pressure solenoid valves to establish respective transmission gear speeds. The hydraulic control apparatus includes a simultaneous engagement signal switch valve configured to be switched from a non-output position where an output of a simultaneous engagement signal pressure is not produced to an output position where an output of the simultaneous engagement signal pressure is produced upon receipt of an input of the engagement pressures by a number larger than the predetermined number of valves; and an original pressure switch valve configured to be switched from a supply position where an original pressure is supplied to the engagement pressure solenoid valves to a blocked position where the original pressure is blocked upon receipt of an input of the simultaneous engagement signal pressure from the simultaneous engagement signal switch valve.
摘要:
A shift device, which sends a command signal to an electric actuator for shifting a plurality of gear ranges of a transmission of a vehicle by the electric actuator. The gear ranges include a plurality of drive ranges and a parking range. A shift lever is arranged to move between a neutral position and a plurality of manipulation positions located about the neutral position. A restoration mechanism restores the shift lever to the neutral position. A first sensor electrically detects a manipulation performed to select one of the drive ranges. A second sensor electrically detects a manipulation performed to select the parking range. The first sensor detects toward which of the manipulation positions the shift lever is manipulated.
摘要:
A shift device, which sends a command signal to an electric actuator for shifting a plurality of gear ranges of a transmission of a vehicle by the electric actuator. The gear ranges include a plurality of drive ranges and a parking range. A shift lever is arranged to move between a neutral position and a plurality of manipulation positions located about the neutral position. A restoration mechanism restores the shift lever to the neutral position. A first sensor electrically detects a manipulation performed to select one of the drive ranges. A second sensor electrically detects a manipulation performed to select the parking range. The first sensor detects toward which of the manipulation positions the shift lever is manipulated.
摘要:
A condition for driving an electric oil pump is set. A turbine speed or an input speed of an automatic transmission is measured. A correction amount for a hydraulic pressure is calculated on the basis of the turbine speed obtained by reference to a relation between the turbine speed and hydraulic pressure, and a correction amount for a drive duty ratio of the electric oil pump which is required for generation of the corrected hydraulic pressure is calculated. The procedure is resumed after the procedure has been performed. The condition for driving the electric oil pump is updated on the basis of the correction amount for the drive duty ratio calculated.
摘要:
An electric oil pump capable of suppressing wear of an electric oil pump used as auxiliary to a main oil pump to thereby prolong the life of the pump and avoid any need to provide a larger pump. An electric oil pump (40) is operated only for a predetermined acceptable operation time, and the engine (12) is thereafter activated to cause the mechanical oil pump (36) to supply oil pressure. This arrangement can limit successive operating time for the electric oil pump (40), suppressing wear of the electric oil pump (40) and thus prolonging its life. Provision of a larger electric oil pump (40) can also be avoided.
摘要:
A display system for an automatic transmission including: a first range switching mechanism for switching a shift range by a mechanical operation; and a second range switching mechanism activated by electric enabling mechanism for switching the shift range by an electric operation. The display system comprises: a first display device for displaying the shift range which is selected by the first range switching mechanism; a second display device for displaying the active state of the enabling mechanism; and a third display device for displaying the shift range which is selected by the second range switching mechanism activated by the enabling mechanism.
摘要:
In an automatic transmission, torque shocks are effectively reduced in specific downshifting conditions where relatively strong engine braking occurs as a result of downshifting. When a downshift command to the automatic transmission is detected when an accelerator pedal is not depressed, a valve opening command is issued to a throttle valve so that engine output will have increased by the time the downshifting action of the automatic transmission actually begins, ignition timing is delayed so that an increase in engine output resulting from the opening of the throttle valve by a throttle valve control means is offset for a period starting at the time the engine output actually increases as a result of the opening of the throttle valve by the throttle valve control means and ending at the time the downshifting action of the automatic transmission actually beings, and the ignition timing delaying is cancelled upon initiation of the downshifting action of the automatic transmission.
摘要:
In a system for shift control in an automatic transmission, wherein gear stages are automatically switched in accordance with a preset shift pattern, judgment is made as to whether or not a shifting was abnormal, and, if it is judged as abnormal, the shift pattern in the subsequent shifting is changed to a fail shift pattern, in which shift points are set slightly low. With this arrangement, the durability of frictionally engaging devices is secured.
摘要:
Disclosed herein is a method which provides substantially zero acid number polytetramethylene ether glycol thus making it possible to regard polytetramethylene ether glycol as a fungible commodity. The improvement is achieved by complete removal of a trace impurity, believed to be n-butyl aldehyde, from dry tetrahydrofuran, by contact with molecular sieves of a particular definition, prior to the polymerization of the tetrahydrofuran in the production of polytetramethylene ether glycol.