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Apparatus and method for controlling continuously variable transmission and program for performing the control method

A technology of continuously variable transmission and control method, which is applied in the direction of transmission, transmission control, and components with teeth, etc., which can solve problems such as transmission impact and achieve the effect of reducing transmission impact

Inactive Publication Date: 2009-09-02
TOYOTA JIDOSHA KK
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  • Abstract
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Problems solved by technology

However, when the braking operation is started while driving the vehicle at a high speed, the clamping pressure of the belt gradually increases when the vehicle speed has decreased to a predetermined low speed, so that the clamping pressure of the belt may deviate from the braking operation timing, and may cause transmission shock

Method used

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  • Apparatus and method for controlling continuously variable transmission and program for performing the control method
  • Apparatus and method for controlling continuously variable transmission and program for performing the control method
  • Apparatus and method for controlling continuously variable transmission and program for performing the control method

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Embodiment Construction

[0032] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. In the following description, the same or similar elements throughout the various embodiments of the present invention bear the same or similar reference numerals. The same or similar technical terms are given to the same or similar elements, and they perform the same or similar functions. Therefore, detailed descriptions of the same or similar elements are omitted for convenience.

[0033] Refer to the following figure 1 A vehicle equipped with the control device according to the first embodiment of the present invention will be described. The output power of the engine 200 included in the drive unit 100 installed in the vehicle is transmitted to the belt type continuously variable transmission 500 via the torque converter 300 and the forward / reverse drive conversion unit 400 . The output power of the belt type continuously variable transmissio...

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Abstract

The present invention relates to an apparatus and method for controlling a CVT (500)(continuously variable transmission), and a program for executing the control method that reduces a transmission shock during a braking operation. When a foot brake switch (916)is turned on and a vehicle speed is less than or equal to a threshold speed V(0), the ECU (900) increases a clamping pressure applied to a transmission belt (510) to a pressure level P(ON) higher than a normal pressure P(OFF). When the vehicle speed falls to or below the threshold speed when the foot brake switch (916) is turned on, the ECU prohibits an increase in the clamping pressure applied to the transmission belt(510).

Description

technical field [0001] The present invention generally relates to an apparatus and method for controlling a continuously variable transmission (CVT) and a program for executing the control method. In particular, the present invention relates to a technique for controlling the clamping pressure of a drive belt of a continuously variable transmission. Background technique [0002] In the prior art, a continuously variable transmission (CVT) is known in which a drive belt sandwiches a pair of pulleys having variable groove widths. In this CVT, the clamping pressure of the belt prevents the belt from slipping on the pulleys. However, during a rapid braking operation of the vehicle, the output speed of the continuously variable transmission decreases rapidly, so that the torque applied to the drive belt increases excessively. In the above case, the drive belt may slip on the pulley due to this excessively increased torque. In order to prevent a belt from slipping on a pulley i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/662F16H9/00F16H59/44F16H59/48F16H59/54F16H61/02F16H61/66
CPCF16H61/66272F16H2061/66281
Inventor 井上大辅
Owner TOYOTA JIDOSHA KK
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