摘要:
An overtop position is to be established in a hydrostatic type continuously variable transmission, and an increase of the maximum speed and the maintenance of power performance are to be made compatible with each other. In a hydrostatic type continuously variable transmission, the angle of inclination of a movable swash plate is controlled in such a manner that a target Ne is calculated from both RC (riding condition) and throttle valve opening, then the target Ne thus calculated is compared with an actual Ne to determine a rotational direction and DUTY of a control motor. The operation of the control motor is controlled in accordance with the thus-determined data and angle information on the angle of the movable swash plate provided from an angle sensor. In constant speed vehicular traveling, the change gear ratio is set at TOP ratio and a shift is made to OVERTOP when predetermined overtop control conditions ((1) the current change gear ratio should be at TOP position, (2) the degree opening of a throttle valve should exceed a threshold value determined according to a vehicular speed, and (3) the engine speed should exceed a preset value) are satisfied, thereby increasing the maximum vehicle speed.
摘要:
A hydrostatic continuously variable transmission includes a hydraulic pump and a hydraulic motor, supported by a common support shaft, and hydraulically connectable to each other through a hydraulic circuit including an inside passage and an outside passage. A clutch device includes a valve spool, which is slidably disposed in a hollow internal bore formed in the transmission support shaft. The valve spool is operable to make or interrupt fluid communication between the inside passage and the outside passage, according to the movement thereof. A governor mechanism is mounted to a pump casing of the hydraulic pump, and the governor mechanism generates a governor force corresponding to the rotating speed of a clutch cap, by use of centrifugal force generated by the rotation thereof. The valve spool is effectively moved in the hollow internal bore, using the governor force generated from the governor mechanism, to engage or disengage the clutch.
摘要:
A hydrostatic continuously variable transmission includes a hydraulic pump and a hydraulic motor, supported by a common support shaft, and hydraulically connectable to each other through a hydraulic circuit including an inside passage and an outside passage. A clutch device includes a valve spool, which is slidably disposed in a hollow internal bore formed in the transmission support shaft. The valve spool is operable to make or interrupt fluid communication between the inside passage and the outside passage, according to the movement thereof. A governor mechanism is mounted to a pump casing of the hydraulic pump, and the governor mechanism generates a governor force corresponding to the rotating speed of a clutch cap, by use of centrifugal force generated by the rotation thereof. The valve spool is effectively moved in the hollow internal bore, using the governor force generated from the governor mechanism, to engage or disengage the clutch.
摘要:
A continuously variable hydrostatic transmission in which a fixed displacement hydraulic pump and a variable displacement hydraulic motor are disposed on a drive axle, and connected via a closed hydraulic circuit. The continuously variable hydrostatic transmission shifts gears by changing the inclination angle of a movable swashplate provided for the variable displacement the hydraulic motor. The continuously variable hydrostatic transmission may perform a correction control, where the movable swashplate is moved to the TOP side, and the maximum value of the shift amount is obtained. Then, the movable swashplate is moved to the LOW side, and the minimum value is obtained. By storing the maximum and minimum values, correction data is derived. After that, the TOP and LOW transmission gear ratios are determined on the basis of the correction data.
摘要:
A brake device 10 for a motorcycle is capable of electrically performing driving so as to control a front wheel brake caliper 16 and a rear wheel brake caliper 18 in response to each operation of a brake lever 12 and a brake pedal 14 and is configured so that the rear wheel brake caliper 18 and the front wheel brake caliper 16 can be combined based on the operation of the brake pedal 14. The brake device 10 performs correction of a target hydraulic pressure acting on the front wheel brake caliper 16 using a prescribed preset function in such a manner as to give a braking force smaller than a braking force corresponding to an additional operation of the brake lever 12 when the brake lever 12 is additionally operated in the state where the brake pedal 14 is operated and the front wheel brake caliper 16 is generating braking force in combination with the rear wheel brake caliper 18.
摘要:
A brake apparatus includes first, second and third solenoid valves (hereinafter SOL1, SOL2 and SOL3) respectively disposed in a first branch pipe, a second branch pipe, and a main pipe connecting a master cylinder and a brake caliper. The brake apparatus also includes first, second and third pressure sensors (hereinafter P1, P2 and P3) respectively disposed between the master cylinder and the SOL3, between the SOL1 and a fluid loss simulator, and between the SOL2 and the hydraulic pressure modulator. The brake apparatus further includes a control unit for detecting output values of P1, P2 and P3. A resolution of P2 is set at a value greater than resolutions of P1 and P3. With SOL1 in an opened state, when detected output value of P2 is less than a predetermined value, the control unit stores output values from the respective pressure sensors as reference values.
摘要:
A brake apparatus includes first, second and third solenoid valves (hereinafter SOL1, SOL2 and SOL3) respectively disposed in a first branch pipe, a second branch pipe, and a main pipe connecting a master cylinder and a brake caliper. The brake apparatus also includes first, second and third pressure sensors (hereinafter P1, P2 and P3) respectively disposed between the master cylinder and the SOL3, between the SOL1 and a fluid loss simulator, and between the SOL2 and the hydraulic pressure modulator. The brake apparatus further includes a control unit for detecting output values of P1, P2 and P3. A resolution of P2 is set at a value greater than resolutions of P1 and P3. With SOL1 in an opened state, when detected output value of P2 is less than a predetermined value, the control unit stores output values from the respective pressure sensors as reference values.
摘要:
A brake system includes a front and a rear wheel brake circuit which are independent of each other. Each circuit includes: a master cylinder connected to a brake caliper through the main brake line; a hydraulic pressure modulator which causes an electrically-operated motor to generate hydraulic pressure; and a normally-open electromagnetic on-off valve. When the two brake circuits are moved in response to operation of a braking operation unit in one circuit, in the brake circuit for which a braking operation unit was operated earlier, the electromagnetic on-off valve opens so that the brake caliper is operated by use of hydraulic pressure from the master cylinder. In the other brake circuit, the electromagnetic on-off valve is closed so that the brake caliper is operated by use of hydraulic pressure from the hydraulic pressure modulator. The braking system uses simple wheel braking mechanism and piping, and concurrently reduces electric current consumption.
摘要:
A braking system includes first pressure sensors 35, 35 which are provided to braking pipes 41, 41 which constitute first input-side pressure sensors for detecting a liquid pressure on a front-wheel-master-cylinder-25 side and a rear-wheel-master-cylinder-82 side, and second pressure sensors 36, 36 which are provided at positions closer to a stroke-simulator-28 side than second solenoid-operated valves 31, 31 of braking pipes 27,27 which constitute second input-side pressure sensors for detecting a liquid pressure on the stroke-simulator-28 side.
摘要:
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.