| 摘要 |
An automatic transmission wherein means for effectuating a kickdown effect in an automatic transmission for the vehicle are provided, having associated therewith a kickdown mechanism, wherein the transmission is provided with hydraulic torque converter means having a hydraulic torque converter pump connected to the engine output shaft, and a hydraulic torque converter turbine connected to the input shaft of transmission, friction engaging means for determining the desired operative gearing for said transmission; an oil pressure operation circuit for controlling said friction engaging means and having a manual speed change value determining valve and a distribution valve for distributing the operation oil into said friction engaging means; a signal generator means for generating electric signals based on the slip ratio and vehicle speed; a gear position determining signal generator for generating a gear position electric signal by detecting the gearing state of said transmission; a synchronous time retaining means for maintaining generating output electric signals in time relationship upon the operation of said distribution valve; a bistable memorial circuit for establishing the conductivity or non-conductivity of the means for the operation or non-operation of said distribution valve by erasing the output electric signal when an input electric signal is added to one input terminal and by maintaining the generating output electric signal when an input electric signal is added to another input terminal; an AND-circuit for generating an output electric signal when the electric signal for speed change into the high gear state from said signal generator, the electric signal from said synchronous time retaining means, and the electric signal for speed change into the one stage lower gear position signal from said signal generator are coexistent for carrying out the speed change into high gear by adding the aforesaid electric signal to said one terminal of said bistable memorial circuit; an OR-circuit for generating an output electric signal when one of the electric signals for the one-stage lower gear position speed change from said running signal generator is present; an AND-circuit for carrying out the speed change into the one-stage lower gear position by adding an electric signal to said other terminal of said bistable memorial circuit by generating the output electric signal when the electric signal from said OR-circuit, the electric signal from the high gear position signal and the electric signal from the synchronous time retaining circuit are coexistent; and means for operating said bistable memorial circuit and said distribution valve; and AND-circuit between said means and said bistable memorial circuit; and providing a kickdown signal generator for delivering kickdown signal to said AND-circuit through NOT-means; whereby the said distribution valve is brought into non-operable state when the signal from said NOT-means among the signals from NOT-means and said bistable memorial circuit is eliminated, thereby effectuating a kickdown as aforesaid.
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