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Control apparatus for hydraulically operated vehicular transmission
| Details |
Inventors: Tamai, Masaya; Shimizu, Yasushi; Yamashita, Masaru;
Assignee: Honda Giken Kogyo Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: Wright; Dirk
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Westerman, Hattori, McLeland & Naughton
A control apparatus for a hydraulically operated vehicular transmission having a plurality of speed change steps includes a shift valve unit controlling the supplying of hydraulic oil to and discharging of hydraulic oil from hydraulic pressure coupling elements for the respective speed change steps, a throttle hydraulic pressure signal outputting device which outputs a throttle hydraulic pressure signal which is applied to switch the shift valve unit, according to a throttle opening degree of an engine and an accumulator connected to an input oil path through which the throttle hydraulic pressure signal is applied to the shift valve unit. |
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DETAILED DESCRIPTION In view of the foregoing, an object of the invention is to provide a control device of pure hydraulic pressure control type which is simple in structure, and prevents the skipping down shift and the skipping up shift.
The foregoing object of the invention has been achieved by the provision of a control apparatus for a hydraulically operated vehicular transmission having a plurality of speed change steps, including a shift valve unit which controls the supplying of hydraulic oil to and the discharging of hydraulic oil from the hydraulic pressure coupling elements for the respective speed change steps, a throttle hydraulic pressure signal outputting device which outputs a throttle hydraulic pressure signal which is applied to switch the shift valve unit, according to a throttle opening degree of an engine and an accumulator connected to an input oil path through which the throttle hydraulic pressure signal is applied to the shift valve unit.
With the control apparatus, even if the throttle opening degree is abruptly increased, the hydraulic pressure is stored in the accumulator, so that the throttle hydraulic pressure signal of the input oil path is gently increased, and the shift valve unit is switched from the state that the high speed step is established through the state that the middle speed step is established to the state that the low speed step is established; that is, the skipping down shift from the high speed step directly to the low speed step is prevented.
In addition, even if the throttle opening degree is abruptly decreased, hydraulic oil is pushed out of the accumulator, so that the throttle hydraulic pressure signal of the input oil path is gently decreased, and the shift valve unit is switched from the state that the low speed step is established through the state that the middle speed step is established to the state that the high speed step is established; that is, the skipping up shift from the low speed step directly to the high speed step is prevented
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