EP0490627A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Shift control system
Assignee: Honda Motor Co Ltd
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Filing: 1991-12-10
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Granted: —
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Expires: 2011-12-10
Abstract
Abstract A shift control system for a vehicle transmission (M) with multiple gear trains and connected to an engine crankshaft (CR) through a clutch (C) for shifting without disengaging the clutch (C). In conducting a shifting operation through a roller synchro mechanism (R) associated with a gear train, the number of revolutions of the engine crankshaft (CR) is promptly decreased through at least one of an ignition control means (M₁) and a fuel supply control means (M₂) to synchronize the number of revolutions of a main shaft (Sm) and a counter shaft (Sc) of the transmission when the number of revolutions of the main shaft (Sm) is greater than the number of revolutions for synchronizing with the counter shaft (Sc) and the number of revolutions of the engine crankshaft (CR) is increased to synchronize the number of revolutions of the main shaft (Sm) and the counter shaft (Sc) when the number of revolutions of the main shaft (Sm) is less than the number of revolutions for synchronizing with the counter shaft (Sc). This enables a prompt shifting.
Inventors
- 👤 Kiyoshi c/o Kabushiki Kaisha Honda Oikawa
- 👤 Takafumi c/o Kabushiki Kaisha Honda Tsurumi
- 👤 Akihito c/o Kabushiki Kaisha Honda Ohhashi
- 👤 Noboru c/o Kabushiki Kaisha Honda Ashikawa
- 👤 Kouji c/o Kabushiki Kaisha Honda Yamaguchi
- 👤 Hisashi c/o Kabushiki Kaisha Honda Kunii
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 09:56
CPC Classifications
B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/11; B60W30/00; B60W30/18; B60W2710/00; B60W2710/06; B60W2710/0605; B60W2710/0644; F; F16; F16H; F16H61/00; F16H61/04; F16H61/0403; F16H61/68; F16H61/682; F16H63/00; F16H63/02; F16H63/08; F16H63/16; F16H63/18; F16H63/40; F16H63/50; F16H63/502; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19251
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
286 words
A shift control system for a vehicle transmission comprising a main shaft connected to an engine crankshaft through a clutch; a counter shaft connected to the main shaft through a plurality of gear trains; a roller synchro mechanism for bringing any of the gear trains into engagement with the main shaft and the counter shaft to establish a desired shift stage; an engine revolutions number increasing/decreasing means for selectively either increasing or decreasing the number of revolutions of the engine crankshaft to synchronize the number of revolutions of the main shaft with the number of revolutions of the counter shaft in order to operate the roller synchro mechanism with the clutch left in engagement to establish a desired shift stage; and an electronic control unit for controlling operations of the engine revolutions number increasing/decreasing means and the roller synchro mechanism, wherein said engine revolutions number increasing/decreasing means includes a throttle actuator and at least one of an engine-ignition control means and a fuel supply control means, and said electronic control unit operates to decrease the number of revolutions of the engine crankshaft through either the ignition control means or the fuel supply control means or both when the number of revolutions of the main shaft is greater than the number of revolutions for synchronizing with the counter shaft, and to increase the number of revolutions of the engine crankshaft through the throttle valve control means when the number of revolutions of the main shaft is less than the number of revolutions for synchronizing with the counter shaft, and operates the roller synchro mechanism in a state where the number of revolutions of the main shaft is synchronized with the number of revolutions of the counter shaft.
Claim 2
Dependent Claim
88 words
The shift control system according to claim 1, further including a plurality of intake passages provided side by side in an intake passage defining member connected to the engine of a multi-cylinder type; and a plurality of throttle valves each disposed in corresponding one of the intake passages and mounted on a single throttle shaft means; and a throttle opening degree sensor connected to said throttle shaft means in the vicinity of a location at which a motor as said throttle actuator is connected to the throttle shaft.
Claim 3
Dependent Claim
47 words
The shift control system according to claim 2, wherein said throttle actuator is connected at one end of said throttle shaft means with an axis of a drive shaft of the throttle actuator being disposed in a vertical direction perpendicular to an axis of the throttle shaft.
Claim 4
Dependent Claim
77 words
The shift control system according to any of claims 1, 2 or 3, further including an acceleration pedal sensor connected to said electronic control unit and to an acceleration pedal provided at an upper end thereof with a pedal portion to extend vertically for detecting the position of the acceleration pedal, and said acceleration pedal sensor being swingably supported at its lower end in a vehicle body frame and biased in a returning direction by spring means.
Claim 5
Dependent Claim
110 words
The shift control system according to claim 4, further including a support frame fixed to the vehicle body frame behind the acceleration pedal: a shaft rotatably supported on said support frame and having an axis parallel to an axis around which the acceleration pedal is swung; a drum connected to said acceleration pedal through a wire and fixed to the shaft within the support frame; and said spring means comprising a coiled return spring interposed between said drum and said support frame and disposed within said support frame to surround said shaft; said acceleration pedal sensor being mounted to a side of said support frame and connected to said shaft.
References Cited (Backward Citations)
No citation records indexed.
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