Apparatus for controlling continuously variable transmission

Details Apparatus for controlling continuously variable transmission Apparatus for controlling continuously variable transmission

1984-07-20

1987-04-07

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 474 12, 474 28, B60K 4112

Patent

active

046565876

ABSTRACT:
The apparatus for controlling the CVT for a vehicle includes means for controlling a desired speed ratio of the CVT, means for storing a map of engine speed versus positions of the throttle valve for providing the minimum fuel consumption and means for calculating, by use of the map, a desired engine speed value corresponding to the detected throttle position. Also provided are means for determining a first operating area of the engine speed based upon the throttle opening, which area is spaced from the desired engine speed and is capable of providing sufficient power to obtain a smooth acceleration at a fixed transmission ratio as well as means for determining a second operating area of the engine speed based on the vehicle speed where the engine speed is high in relation to the vehicle speed, the second area being spaced from the desired engine speed and being capable of providing sufficient power to obtain a smooth acceleration at a fixed transmission ratio. Means are also provided for providing a signal to the transmission varying means for maintaining a current fixed speed ratio when the engine is operating in the first or second area, as well as means for providing a signal to the transmission varying means for varying the speed ratio so that the actual engine speed corresponds to the desired engine speed when the engine is in an area other than the first and second areas.

REFERENCES:
patent: 4515040 (1985-05-01), Takeuchi et al.
patent: 4534243 (1985-08-01), Yokoyama et al.
patent: 4536171 (1985-08-01), Tanaka et al.
patent: 4543077 (1985-09-01), Yamamuro et al.

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