Claims
- 1. In a vehicle transmission system including an operation sensor, a running status sensor, a processor and a memory storing relation data between target speed and data measured by use of said operation sensor and said running status sensor, a speed ratio control method for a continuously variable transmission which transfer inputs from a power source to a drive wheel, comprising the steps of;
- measuring through said operation and said running status sensors, a driver's operation quantity and a vehicle running status;
- determining through said processor, by use of said relation data, one of a target value of speed ratio and a target value of revolution speed on an input of said transmission on a basis of results of said measuring step; and
- changing a speed ratio using at least two different algorithms in correspondence with whether or not a value of deviation between said target value and a current actual value is greater than a threshold value.
- 2. A speed ratio control method for a transmission according to claim 1, wherein a changing in said changing step is performed on a deviation and velocity of deviation variation when an absolute value of said deviation is smaller than a predetermined value.
- 3. In a vehicle transmission system including an operation sensor, a running status sensor, a processor and a memory storing relation data between target speed and data measured by use of said operation sensor and said running status sensor, a speed ratio control method for a continuously variable transmission which transfer inputs from a power source to a drive wheel, comprising the steps of;
- measuring through said operation and said running status sensors, a driver's operation quantity and a vehicle running status;
- determining through said processor, by use of said relation data, one of a target value of speed ratio and a target value of revolution speed on an input of said transmission on a basis of results of said measuring step; and
- changing a speed ratio using at least two different algorithms in correspondence with whether or not a value of deviation between said target value and a current actual value is greater than a threshold value;
- wherein at least one of said different algorithms uses fuzzy logic rules.
- 4. In a vehicle transmission system including an operation sensor, a running status sensor, a processor and a memory storing relation data between target speed and data measured by use of said operation sensor and said running status sensor, a speed ratio control method for a continuously variable transmission which transfer inputs from a power source to a drive wheel, comprising the steps of;
- measuring through said operation and said running status sensors, a driver's operation quantity and a vehicle running status;
- determining through said processor, by use of said relation data, one of a target value of speed ratio and a target value of revolution speed on an input of said transmission on a basis of results of said measuring step; and
- changing a speed ratio using at least two different algorithms in correspondence with whether or not a value of deviation between said target value and a current actual value is greater than a threshold value;
- wherein said changing step is performed according to when an absolute value of said deviation is larger than a predetermined value, said speed ratio is changed based on an at least one of a vehicle acceleration value, and a value which is at least one of a ratio and difference between a predicted time until said deviation becomes 0, and a predicted response time necessary for stopping a speed by use of a speed ratio control actuator.
- 5. In a vehicle transmission system including an operation sensor, a running status sensor, a processor and a memory storing relation data between target speed and data measured by use of said operation sensor and said running status sensor, a speed ratio control method for a continuously variable transmission which transfer inputs from a power source to a drive wheel, comprising the steps of;
- measuring through said operation and said running status sensors, a driver's operation quantity and a vehicle running status;
- determining through said processor, by use of said relation data, one of a target value of speed ratio and a target value of revolution speed on an input of said transmission on a basis of results of said measuring step; and
- changing a speed ratio using at least two different algorithms in correspondence with whether or not a value of deviation between said target value and a current actual value is greater than a threshold value;
- wherein said changing step further comprises: when both an acceleration pedal position variation velocity and an absolute value of said deviation between said target value and the actual value are smaller than predetermined values, said speed ratio is not changed.
- 6. In a vehicle including an operation sensor, a running status sensor, a processing means and a memory storing relation data between target speed and data measured by use of said operation sensor and said running status sensor, a speed ratio control system of a continuously variable transmission which transfers inputs from a power source to a drive wheel, comprising:
- means for measuring a driver's operation quantity and a vehicle running status;
- means for determining one of a target value of speed ratio and a target value of revolution speed on an input of said transmission on a basis of results from said means for measuring; and
- means for changing a speed ratio using at least two different algorithms in correspondence with whether or not a value of deviation between said target value and a current actual value is greater than a threshold value.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2-311507 |
Nov 1990 |
JPX |
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Parent Case Info
This application is a continuation of Ser. No. 07/794,038, filed Nov. 19, 1991, now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (1)
Number |
Date |
Country |
63-269744 |
Aug 1988 |
JPX |
Non-Patent Literature Citations (2)
Entry |
Prototype Design and Testing of the Half Toroidal CVT, Hisashi Machida and Nobuhide Kurachi, Trilogy R&D, Nippon Seiko K. K., SAE 900552 (1990). |
"Electronically Controlled Continuously Variable Transmission (ECVT-II)", International Congress on Transporation Electronics Proceedings, Y. Kasai, Y. Morimoto, Oct. 17-18, 1988, pp. 33-42. |
Continuations (1)
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Number |
Date |
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Parent |
794038 |
Nov 1991 |
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