Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope

A comprehensive control, electric vehicle technology, applied in transmission control, components with teeth, belts/chains/gears, etc. Enhanced ride comfort and smooth shifting

Inactive Publication Date: 2012-04-25
BEIJING INSTITUTE OF TECHNOLOGYGY
View PDF4 Cites 22 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the AMT system adopts the usual gear shift strategy when the electric vehicle is driving uphill, it may result in poor driving comfort of the vehicle due to the problem of gea...

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
  • Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope
  • Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope
  • Combinational control method of gear shift by automatic mechanical transmission (ATM ) system of electric automobile running on upslope

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0014] In a pure electric vehicle equipped with AMT, the AMT shift process generally goes through three main stages: neutral gear-neutral gear-shift. In addition to the judgment of the gear position, it will also send corresponding control commands to the motor drive system to better complete the gear shifting work. The work of the three stages corresponding to the motor drive system is as follows: zero torque (that is, free rotation state) - speed regulation (according to the command of the AMT system, adjust the speed of the motor drive system to a suitable value) - output torque. It can be seen that the output torque of the motor drive system is always zero during the period from when the neutral gear is selected until the gear is properly combined, and the vehicle will gradually decelerate under the effects of rolling resistance, wind resist...

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

No PUM Login to view more

Abstract

The invention provides a combinational control method of gear shift by an automatic mechanical transmission (ATM) system of an electric automobile running on an upslope. The method comprises the following steps: a control system of a motor drive system monitors in real time and stores motor rotating speed; when shifting gear, the AMT system sends a gear shift effective signal to the motor drive system; after the AMT system has finished gear shift, the motor drive system uses the speed difference before and after gear shift to calculate slope gradient, and thereby calculating the current running resistance of the automobile; the motor drive system performs calculation according to the current running resistance and the maximal torque of the motor drive system to obtain a required variable peed ratio of the AMT when the automobile currently runs; and the motor drive system sends the variable speed ratio obtained by calculation to the AMT system, and then the AMT system regulates the gear of the automobile. Therefore, by adopting the method provided by the invention, successful gear shift can be realized when the electric automobile is running on the upslope, and running smoothness of the automobile can be improved.

Description

technical field [0001] The invention relates to the field of driving electric vehicles, in particular to a comprehensive shift control method for an electric vehicle driving system configured with an AMT transmission system when traveling uphill. Background technique [0002] When the vehicle is running uphill, the resistance it receives is different from that of ordinary driving. In some cases, the slope resistance may become the main component of the vehicle resistance. At the same time, when the vehicle is driving uphill, passability has become the main purpose of the vehicle, while acceleration and economy take second place. Therefore, the choice of gear at this time is different from that on flat roads, and different slopes correspond to different shift strategies. In the literature "AMT vehicle ramp shift strategy and experimental research", the uphill shift strategy is studied for the car with the transmission system composed of internal combustion engine and AMT. Th...

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
no application Login to view more
IPC IPC(8): F16H59/02F16H61/04
Inventor 王志福张承宁叶辉萍
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap