Slip preventing control of toroidal continuously variable transmission
First Claim
1. A slip preventing device of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the device comprising:
- a sensor which detects a temperature of the oil;
a mechanism which suppresses an output torque of the engine; and
a microprocessor programmed to;
control the suppressing mechanism to suppress the output torque of the engine when the temperature of the oil is lower than a predetermined temperature independent of any determination of whether the transmission requires shifting.
1 Assignment
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Accused Products
Abstract
A toroidal continuously variable transmission (2) transmits the rotation output of a vehicle engine (1) at an arbitrary speed ratio. The toroidal continuously variable transmission (2) comprises two disks (31, 32) disposed coaxially, and power rollers (33) in contact with the two disk (31, 32). Surface of the two disks (31, 32) and of the power roller (33) are provided with oil. The oil temporarily collected in oil pan (34). The oil temperature in the oil pan (34) is detected by a sensor (14), and slip of the power rollers (33) is prevented by suppressing the output torque of the engine (1) when the oil temperature is low.
55 Citations
18 Claims
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1. A slip preventing device of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the device comprising:
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a sensor which detects a temperature of the oil;
a mechanism which suppresses an output torque of the engine; and
a microprocessor programmed to;
control the suppressing mechanism to suppress the output torque of the engine when the temperature of the oil is lower than a predetermined temperature independent of any determination of whether the transmission requires shifting. - View Dependent Claims (2, 3, 4, 5)
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6. The slip preventing device of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the device comprising:
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a sensor which detects a temperature of the oil;
a mechanism which suppresses an output torque of the engine; and
a microprocessor programmed to;
control the suppressing mechanism to suppress the output torque of the engine when the temperature of the oil is lower than a predetermined temperature, wherein the microprocessor is further programmed to suppress the output torque of the engine by performing a limitation of an increase rate of the output torque of the engine, wherein the microprocessor is further programmed to stop the limitation of the increase rate when a first period from a starting of the engine has elapsed, and wherein the first period is dependent upon the temperature of the oil. - View Dependent Claims (7)
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8. The slip preventing device of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the device comprising:
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a sensor which detects a temperature of the oil;
a mechanism which suppresses an output torque of the engine; and
a microprocessor programmed to;
control the suppressing mechanism to suppress the output torque of the engine when the temperature of the oil is lower than a predetermined temperature, wherein the engine is connected to the continuously variable transmission via a clutch, and the microprocessor is further programmed to suppress the output torque of the engine by controlling the output suppressing mechanism to prevent the output torque of the engine from exceeding a predetermined torque for a second period from when an engaging of the clutch is performed after a starting of the engine was performed, and wherein the second period is dependent upon the temperature of the oil. - View Dependent Claims (9, 10, 11, 12, 13, 15)
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14. The slip preventing device as defined in 12, claim wherein the device further comprises a sensor which detects an engine rotation speed, and the microprocessor is further programmed to determine whether or not the engaging of the clutch is complete based on a variation of the engine rotation speed, and when the engaging of the clutch is complete, to terminate setting the fuel injection amount of the fuel injector to zero.
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16. The slip preventing device of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the device comprising:
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a sensor which detects a temperature of the oil;
a mechanism which suppresses an output torque of the engine; and
a microprocessor programmed to;
control the suppressing mechanism to suppress the output torque of the engine when the temperature of the oil is lower than a predetermined temperature, wherein the microprocessor is further programmed to suppress the output torque of the engine by limiting the rotation speed of the engine, and wherein the engine is connected to the toroidal continuously variable transmission via a clutch, and the microprocessor is further programmed to stop limiting the rotation speed of the engine when the clutch is engaged.
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17. A slip preventing device of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the device comprising:
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means for detecting a temperature of the oil;
means for suppressing an output torque of the engine; and
means for controlling the suppressing means to suppress the output torque of the engine when the temperature of the oil is lower than a predetermined temperature independent of any determination of whether the transmission requires shifting.
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18. A slip preventing method of a power roller of a toroidal continuously variable transmission which varies an output rotation of an engine of a vehicle under an arbitrary speed ratio, the transmission comprising two disks disposed coaxially, the power roller being in contact with the two disks, and surfaces of the two disks and of the power roller being provided with an oil, the method comprising:
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detecting a temperature of the oil; and
suppressing an output torque of the engine when the temperature of the oil is lower than a predetermined temperature independent of any determination of whether the transmission requires shifting.
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Specification