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EP0354004A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Hydraulic control device for automatic transmission for vehicle adapted to engage clutch at different speed according to engine output power

Assignee: Toyota Motor Corp
•
Filing: 1989-08-01
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Granted: —
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Expires: 2009-08-01
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Abstract

Abstract For an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second hydraulically operated input clutches and adapted to provide the 3rd speed stage in which the first and second input clutches C₁ and C₂ are both engaged ahd the overdrive 4th stage in which the clutch C₁ is disengaged and the clutch C₂ is engaged, the engagement of the clutch C₁ in the 3rd speed stage being not essential unless engine brake availability is required, a hydraulic control device has a switching over valve 330 for switching over supply of a hydraulic pressure to the first clutch C₁ between a first mode of relatively quickly supplying the hydraulic pressure to the first clutch C₁ and a second mode of relatively slowing supplying the hydraulic pressure to the first clutch C₁ according to engine output power so as to select the first mode when engine output power is higher than a determinate power level as in the kickdown and to select the second mode when engine output power is less than the determinate power level as in the overdrive inhibition.

Inventors

  • 👤 Mitsuru Takada
  • 👤 Hiroshi Itoh
  • 👤 Tokuyuki Takahashi
  • 👤 Makoto Funahashi

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-29 23:58
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/04; F16H61/06; F16H61/065; F16H61/10; F16H59/00; F16H59/74; F16H2059/743; F16H61/02; F16H61/0202; F16H61/0251; F16H2061/0255; F16H61/12; F16H2061/1232; F16H2061/1236; F16H59/14; F16H59/24; F16H59/50; F16H59/54; F16H61/067; F16H61/21

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 187 words
For an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second hydraulically operated input clutches and adapted to provide a first speed stage in which said first and second input clutches are both engaged and a second speed stage higher than said first speed stage in which said first input clutch is disengaged and said second input clutch is engaged, the engagement of said first input clutch in said first speed stage being not essential unless engine brake availability is required, a hydraulic control device comprising a switching over valve for switching over supply of a hydraulic pressure to said first input clutch between a first mode of relatively quickly supplying said hydraulic pressure to said first input clutch and a second mode of relatively slowing supplying said hydraulic pressure to said first input clutch according to engine output power so as to select said first mode when engine output power is higher than a determinate power level and to select said second mode when engine output power is less than said determinate power level.
Claim 2
Dependent Claim 187 words
For an automatic transmission for a vehicle such as an automobile having a speed stage shifting mechanism including parallelly arranged first and second hydraulically operated input clutches and adapted to provide a first speed stage in which said first and second input clutches are both engaged and a second speed stage higher than said first speed stage in which said first input clutch is disengaged and said second input clutch is engaged, the engagement of said first input clutch in said first speed stage being not essential unless engine brake availability is required, a hydraulic control device comprising a switching over valve for switching over supply of a hydraulic pressure to said first input clutch between a first mode of relatively quickly supplying said hydraulic pressure to said first input clutch and a second mode of relatively slowing supplying said hydraulic pressure to said first input clutch according to engine output power so as to select said first mode when engine output power is higher than a determinate power level and to select said second mode when engine output power is less than said determinate power level.
Claim 3
Dependent Claim 121 words
A hydraulic control device according to claim 1, further comprising an engine power simulation valve for modulating a line hydraulic pressure available in said hydraulic control device in accordance with a throttle hydraulic pressure available in said hydraulic control device so as to generate an engine power simulation hydraulic pressure which increases or decreases at higher rate along with increase or decrease of said throttle hydraulic pressure than said line hydraulic pressure in a low pressure level region of said throttle hydraulic pressure including a certain pressure level of said throttle hydraulic pressure corresponding to said determinate power level of engine output power, said determinate power level of engine output power being determined based upon said engine power simulation hydraulic pressure.
Claim 4
Dependent Claim 45 words
A hydraulic control device according to claim 1, wherein said second speed stage is an overdrive stage, and said automatic transmission is shifted down from said second speed stage to said first speed stage according to said second mode when said overdrive stage is inhibited.
Claim 5
Dependent Claim 32 words
A hydraulic control device according to claim 1, wherein said automatic transmission is shifted down from said second speed stage to said first speed stage according to said first mode by kickdown.

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