Speed change controller for continuously variable transmission

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,
• 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.

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
• 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.

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,
• 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.

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:

• 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.