F - Mech Eng,Light,Heat,Weapons – 16 – H
Patent
F - Mech Eng,Light,Heat,Weapons
16
H
F16H 59/22 (2006.01) F16H 59/48 (2006.01) F16H 61/21 (2006.01) F16H 61/42 (2006.01) F16H 61/46 (2006.01)
Patent
CA 2342690
A hydrostatic continuously variable transmission includes a fixed capacity hydraulic pump and a variable capacity hydraulic motor, connected by a hydraulic closed circuit. A control system and method for the variable transmission provides a good deceleration feeling when going downhill. In accordance with the control system and method, a range of a selected gear is determined. Next, it is determined whether the vehicle is in an automatic gear shift mode. If these conditions are met, it is then determined whether or not certain criteria for descent control are satisfied. The certain criteria may include: (1) whether the throttle is closed; (2) a speed or acceleration of the vehicle; (3) whether the acceleration exceeds a threshold; and (4) whether simultaneous satisfaction of conditions (1)-(3) exist for a period of time exceeding a fixed time. If all of the criteria are satisfied, the gear ratio is shifted by a specified amount towards a LOW side. Therefore, when driving downhill, the vehicle is not subject to acceleration greater than a predetermined value.
Itani Yoshinobu
Nanri Takehiko
Dennison Associates
Honda Giken Kogyo Kabushiki Kaisha
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