Interrelated power delivery controls – including engine control – Transmission control – Continuously variable friction transmission
Patent
1995-11-28
1998-01-13
Ta, Khoi Q.
Interrelated power delivery controls, including engine control
Transmission control
Continuously variable friction transmission
476 10, 477 46, F16H 1504, F16H 5938
Patent
active
057073139
ABSTRACT:
A transmission ratio control apparatus for a friction-wheel CVT requires no feedback of the offset of a friction wheel and performs stable transmission ratio control. A control circuit is provided for controlling the offsetting of the friction wheel to change transmission ratio. A first unit of the control circuit determines a target input rotational speed based on the throttle valve opening and the vehicle speed. A second unit determines target transmission ratio corresponding to the target input rotational speed. A third unit determines an rotational angle instructional value for a motor to achieve the target input rotational speed. A fourth unit determines a changing rate of actual transmission ratio based on the input rotational speed and the vehicle speed. A fifth unit corrects the motor rotational angle instructional value to reduce changes in transmission ratio as the transmission ratio changing rate increases, and outputs the corrected instructional value to the motor.
REFERENCES:
patent: 4744032 (1988-05-01), Miyaura et al.
patent: 4945483 (1990-07-01), Tokoro
patent: 4993284 (1991-02-01), Oshiage
patent: 5136495 (1992-08-01), Tokoro et al.
patent: 5282400 (1994-02-01), Kobayashi et al.
patent: 5575732 (1996-11-01), Inoue
SAE Technical Paper Series--901761--Masaki Nakano et al., Dynamic Characteristics of Speed Ratio Control of the Halt Toroidal CVT for Passenger Cars, pp. 25-32.
Grabow Troy
Nissan Motor Co,. Ltd.
Ta Khoi Q.
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