Speed change controller for continuously variable transmission
First Claim
1. A speed change controller for use with a continuously variable transmission of a vehicle, said transmission having an actuator for continuously varying a speed change ratio of said transmission, comprising:
- a sensor for detecting a real speed change ratio of the transmission, and a control circuit configured to;
set a target speed change ratio of the transmission according to a running state of the vehicle, calculate a proportional value which is directly proportional to a difference between the target speed change ratio and the real speed change ratio, calculate an integral value which is the integral of the difference between the target speed change ratio and the real speed change ratio, correct the integral value to a predetermined positive value when the integral value is larger than the predetermined positive value, and drive the actuator based on the sum total of the proportional value and the integral value.
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Accused Products
Abstract
In a continuously variable transmission for use with a vehicle comprising an actuator for continuously varying a speed change ratio, a target speed change ratio is set according to the vehicle running conditions and a real speed change ratio of the transmission is detected. A proportional value which is directly proportional to a difference between the target speed change ratio and real speed change ratio, and an integral value of the difference therebetween, are calculated. When the integral value is not within a preset range, the integral value is corrected to a value within the range, and the actuator is driven based on the sum total of the proportional value and the corrected integral value. In this way, a command exceeding the response capability of the actuator is prevented from being output to the actuator, and overshoot of the speed change ratio is prevented.
10 Citations
12 Claims
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1. A speed change controller for use with a continuously variable transmission of a vehicle, said transmission having an actuator for continuously varying a speed change ratio of said transmission, comprising:
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a sensor for detecting a real speed change ratio of the transmission, and a control circuit configured to;
set a target speed change ratio of the transmission according to a running state of the vehicle, calculate a proportional value which is directly proportional to a difference between the target speed change ratio and the real speed change ratio, calculate an integral value which is the integral of the difference between the target speed change ratio and the real speed change ratio, correct the integral value to a predetermined positive value when the integral value is larger than the predetermined positive value, and drive the actuator based on the sum total of the proportional value and the integral value. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A speed change controller for use with a continuously variable transmission of a vehicle, said transmission having an actuator for continuously varying a speed change ratio of said transmission, comprising:
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a sensor for detecting a real speed change ratio of the transmission, a device for detecting a running state of the transmission, and a control circuit configured to;
set a target speed change ratio of the transmission according to a running state of the vehicle, calculate a proportional value which is directly proportional to a difference between the target speed change ratio and the real speed change ratio, calculate an integral value which is the integral of the difference between the target speed change ratio and the real speed change ratio, correct the integral value to a value within a preset range when the integral value does not lie within the preset range, the preset range being set to the running state of the transmission, and drive the actuator based on the sum total of the proportional value and the integral value, wherein the detecting device comprises a sensor for detecting a temperature of lubricating oil of the transmission and sensor for detecting a pressure thereof.
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8. A speed change controller for use with a continuously variable transmission of a vehicle, said transmission having an actuator for continuously varying a speed change ratio of said transmission, comprising:
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a sensor for detecting a real speed change ratio of the transmission, and control circuit configured to;
set a target speed change ratio of the transmission according to a running state of the vehicle, calculate a proportional value which is directly proportional to a difference between the target speed change ratio and the real speed change ratio, calculate an integral value which is the integral of the difference between the target speed change ratio and the real speed change ratio, calculate a command value to be output to the actuator based on the proportional value and the integral value, calculate a variation rate of the command value, stop calculating the integral value when the variation rate exceeds a predetermined variation rate, and drive the actuator by outputting the command value thereto. - View Dependent Claims (9, 10)
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11. A speed change controller for use with a continuously variable transmission of a vehicle, said transmission having an actuator for continuously varying a speed change ratio of said transmission, comprising:
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a sensor for detecting a real speed change ratio of the transmission, a device for detecting a running state of the transmission, and a control circuit configured to;
set a target speed change ratio of the transmission according to a running state of the vehicle, calculate a proportional value which is directly proportional to a difference between the target speed change ratio and the real speed change ratio, calculate an integral value which is the integral of the difference between the target speed change ratio and the real speed change ratio, calculate a command value to be output to the actuator based on the proportional value and the integral value, calculate a variation rate of the command value, stop calculating the integral value when the variation rate exceeds a predetermined variation rate, the predetermined variation rate being determined according to the running state of the transmission, and drive the actuator by outputting the command value thereto, wherein the detecting device comprises a sensor for detecting a temperature of lubricating oil of the transmission and a sensor for detecting a pressure thereof.
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12. A speed change controller for use with a continuously variable transmission of a vehicle, said transmission having an actuator for continuously varying a speed change ratio of said transmission, comprising:
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means for detecting a real speed change ratio of the transmission, means for setting a target speed change ratio of the transmission according to a running state of the vehicle, means for calculating a proportional value which is directly proportional to a difference between the target speed change ratio and the real speed change ratio, means for calculating an integral value which is the integral of the difference between the target speed change ratio and the real speed change ratio, means for correcting the integral value to a predetermined positive value when the integral value is larger than the predetermined positive value, and means for driving the actuator based on the sum total of the proportional value and the integral value.
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Specification