Method and system for controlling speed ratio of CVT
What is Al technical title?
Al technical title is built by PatSnap Al team. It summarizes the technical point description of the patent document.
A technology of continuously variable transmission and control method, which is applied in the direction of transmission control, elements with teeth, belts/chains/gears, etc. The effect of not adjusting the speed ratio in time and increasing the fuel consumption
Active Publication Date: 2019-11-19
WUHAN UNIV OF TECH
View PDF2 Cites 3 Cited by
Summary
Abstract
Description
Claims
Application Information
AI Technical Summary
This helps you quickly interpret patents by identifying the three key elements:
Problems solved by technology
Method used
Benefits of technology
Problems solved by technology
[0003] At present, the speed ratio control of most continuously variable transmissions in China adopts two modes, namely economic mode and power mode, which are usually set as two button switches for the driver to choose, but in fact most of the time the driver keeps the economic mode switch normally. On, because this is enough to cope with most situations in daily life. When encountering extreme conditions such as climbing a steep slope, the driver may turn on the power mode, but after passing this condition, the driver will switch back to In economical mode, the manual switching of modes brings inconvenience to the driver, and makes the speed ratio adjustment untimely and inaccurate due to manual operation
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more
Image
Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
Click on the blue label to locate the original text in one second.
Reading with bidirectional positioning of images and text.
Smart Image
Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0031] An embodiment of the present invention provides a speed ratio control method of a continuously variable transmission. The schematic flow chart of the method is shown in the figure, and the method includes the following steps:
[0032] collecting data on the opening of the accelerator pedal, and judging whether the opening of the accelerator pedal is less than or equal to a first preset threshold according to the data on the opening of the accelerator pedal,
[0033] If so, then the CVT output economic speed ratio i eco , otherwise judge whether the accelerator pedal opening is greater than or equal to the second preset threshold,
[0034] If so, the CVT output power ratio i spt , otherwise the CVT outputs a comprehensive speed ratio in, is the opening degree of the accelerator pedal; wherein, the first preset threshold is smaller than the second preset threshold.
[0035] Preferably, the above-mentioned continuously variable transmission speed ratio control method...
Embodiment 2
[0060] The present invention also provides a continuously variable transmission speed ratio control system, including a displacement sensor, a continuously variable transmission control unit,
[0061] The displacement sensor is used to collect the opening of the accelerator pedal, and send the collected data of the opening of the accelerator pedal to the control unit of the continuously variable transmission through the CAN bus, and the control unit of the continuously variable transmission is used to , judging whether the accelerator pedal opening is less than or equal to a first preset threshold,
[0062] If so, the continuously variable transmission control unit controls the continuously variable transmission so that it outputs the economical speed ratio i eco , otherwise the continuously variable transmission control unit judges whether the accelerator pedal opening is greater than or equal to the second preset threshold,
[0063] If so, the continuously variable transmis...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
PUM
Login to view more
Abstract
The invention discloses a method and system for controlling speed ratio of a CVT, and belongs to the technical field of continuously variable transmissions. According to the method and system controlling speed ratio of the CVT, the problem that the speed ratio adjustment cannot respond to the driving mode intention of a driver in time and accurately is solved. The method for controlling the speedratio of the CVT includes the following steps of collecting opening data of an accelerator pedal; judging whether the opening of the accelerator pedal is less than or equal to the first preset threshold according to the opening data of an accelerator, and if yes, outputting economic speed ratio ieco by the CVT; and otherwise judging whether the opening of the accelerator pedal is greater than or equal to the second preset threshold, if yes, outputting dynamic speed ratio ispt by the CVT, and if not, outputting comprehensive speed ratio by the CVT, wherein the comprehensive speed ratio is the accelerator pedal opening. According to the method and system controlling speed ratio of the CVT, the self-adaptive adjustment among the economic speed ratio, comprehensive speed ratio and dynamic speed ratio is achieved, so that the problem that the speed ratio adjustment is not timely and accurate due to the need of manual operation in the prior art is avoided.
Description
technical field [0001] The invention relates to the technical field of continuously variable transmissions, in particular to a method and system for controlling the speed ratio of a continuously variable transmission. Background technique [0002] With the rapid development of automatic control technology, various industries are undergoing technological reforms of automation and intelligence. Many important parts of the car have an integrated control unit. As an important part of the car, the continuously variable transmission can automatically and continuously change the speed ratio according to the driving conditions of the vehicle so that the engine always works in the ideal area. Through the continuously variable transmission control unit , to control the speed ratio of the transmission, and then adjust the speed ratio of the vehicle. [0003] At present, the speed ratio control of most continuously variable transmissions in China adopts two modes, namely economic mode ...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more
Application Information
Patent Timeline
Application Date:The date an application was filed.
Publication Date:The date a patent or application was officially published.
First Publication Date:The earliest publication date of a patent with the same application number.
Issue Date:Publication date of the patent grant document.
PCT Entry Date:The Entry date of PCT National Phase.
Estimated Expiry Date:The statutory expiry date of a patent right according to the Patent Law, and it is the longest term of protection that the patent right can achieve without the termination of the patent right due to other reasons(Term extension factor has been taken into account ).
Invalid Date:Actual expiry date is based on effective date or publication date of legal transaction data of invalid patent.
Login to view more 
Login to view more