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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorsTakehiko Nanri, Yoshinobu Itani
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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.
A method of controlling a hydrostatic continuously variable transmission, which includes a fixed capacity hydraulic pump and a variable capacity hydraulic motor connected by a hydraulic closed circuit, wherein a gear ratio of the variable transmission is changed by altering an angle of a moveable swash plate, said method comprising the steps of:
A hydrostatic continuously variable transmission for a vehicle comprising:
Dependencies are inferred from the claim text.