Transmission control method for continuously variable transmission
AssigneeHonda Motor Co., Ltd.
InventorYasutaka Usukura
Life of this patent
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Abstract
A transmission control method for a continuously variable transmission for enhancing the response of a change in engine speed to a driver's accelerating/decelerating operation. In a hydraulic type continuously variable transmission, when a sport operating mode is being selected (step S1: SPORT OPERATING MODE), a target engine speed T_NE (rpm) is calculated from the vehicle velocity V (km/hr) and the position θ (degrees) of a throttle valve 60 (step S4). Further, a target angle T_A (degrees) for a motor swash plate is calculated from the vehicle velocity and the target engine speed T_NE (step S5). The motor swash plate is moved according to the difference between the actual angle A of the motor swash plate 46 and the target angle T_A.
Claims18
A transmission control method for a swash plate, hydraulic type continuously variable transmission having a plurality of transmission control modes comprising the following steps:
- wherein in a first transmission control mode,
- lowering an actual transmission gear ratio when a target engine speed calculated from vehicle velocity and throttle position is higher than an actual engine speed, and
- raising said actual transmission gear ratio when said target engine speed is lower than said actual engine speed;
- and
- in a second transmission control mode,
- calculating a target transmission gear ratio based on said target engine speed, which is calculated from said vehicle velocity and said throttle position,
- changing said actual transmission gear ratio toward said calculated target transmission gear ratio,
- said actual transmission gear ratio being changed by hydraulic pressure on a transmission movable member of the continuously variable transmission, and
- said transmission movable member is a motor swash plate or a movable member of a transmission actuator for controlling the angle of said motor swash plate.
A transmission control method for a swash plate, hydraulic type continuously variable transmission comprising the following steps:
- calculating a target transmission gear ratio from a target engine speed, which is calculated from vehicle velocity and throttle position, and said vehicle velocity, and
- changing an actual transmission gear ratio toward said calculated target transmission gear ratio,
- said actual transmission gear ratio being changed by hydraulic pressure on a transmission movable member of the continuously variable transmission, and
- said transmission movable member is a motor swash plate or a movable member of a transmission actuator for controlling the angle of said motor swashplate.
A transmission control method for a hydraulic type continuously variable transmission having a plurality of transmission control modes comprising the following steps:
- wherein in a first transmission control mode,
- calculating a target engine speed from a vehicle velocity and throttle position;
- lowering an actual transmission gear ratio when the target engine speed is higher than an actual engine speed, and
- raising said actual transmission gear ratio when said target engine speed is lower than said actual engine speed;
- and
- in a second transmission control mode,
- calculating a target transmission gear ratio based on said target engine speed and said vehicle velocity, and
- changing said actual transmission gear ratio toward said calculated target transmission gear ratio,
- said actual transmission gear ratio being changed by hydraulic pressure on a transmission movable member of the continuously variable transmission
- wherein the continuously variable transmission is controlled by an electrical control unit through a transmission actuator,
- the electronic control unit produces a control signal in accordance with engine speed detected by an engine speed sensor, a position of a throttle valve according to an operation of a throttle grip detected by a throttle position sensor and a vehicle velocity detected by a vehicle velocity sensor, and
- the control signal controls the transmission actuator.
Dependencies are inferred from the claim text.