Vehicle Clutch Zero Point Detection via Motor Torque Calculation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle control systems face challenges in quickly detecting the zero point where the clutch between the drive motor and the driving wheel starts to generate torque capacity, leading to delays in obtaining this critical parameter.
Innovation Solution
A vehicle controlling device that includes a frictional engagement element between the drive motor and the driving wheel, a shifting unit for selecting travel ranges, and units for obtaining motor torque values during different operational modes to calculate the zero point hydraulic pressure command value, allowing for early and quick detection of the zero point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If clutch pressure is changed stepwise to detect the zero point, then measurement precision of the zero point is improved, but detection time increases
Solution Approach 1:
The patent replaces the mechanical stepwise pressure change method with an electronic calculation approach. The zero point hydraulic pressure command value is calculated using equation (1) based on motor torque values obtained during travel range and non-travel range, substituting the gradual mechanical pressure adjustment with instantaneous electronic computation to achieve both precision and speed
Solution Approach 2:
The patent changes the parameter measurement approach from direct pressure measurement through stepwise adjustment to indirect calculation using motor torque parameters. By obtaining motor torque values at different operational states and applying the calculation formula, the system determines the zero point hydraulic pressure command value without requiring gradual pressure changes, thus reducing detection time while maintaining accuracy
2Measurement precision
If motor torque values are obtained during travel and non-travel ranges, then calculation accuracy of zero point hydraulic pressure command value is improved, but parameter acquisition time increases
Solution Approach 1:
The patent performs preliminary acquisition of motor torque values during normal vehicle operation in both travel and non-travel ranges. These parameters are obtained in advance and stored, so when zero point detection is needed, the calculation can be performed immediately using pre-collected data, eliminating the need for dedicated measurement time and reducing overall detection time while maintaining calculation accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables instantaneous and accurate calculation of motor torque values, reducing the time to obtain parameters and increasing the frequency of learning, thereby improving the detection of the zero point hydraulic pressure command value.
Implementation Method 1
a frictional engagement element provided between a drive motor and a driving wheel
Data Source
AI summary
A vehicle controlling device has a frictional engagement element provided between a drive motor and a driving wheel; a shifting unit capable of selecting a travel range or a non-travel range; first obtaining unit configured to, during selection of the travel range, obtain a first parameter including at least a first motor torque value that is a torque value of the drive motor; second obtaining unit configured to, during selection of the non-travel range, obtain a second parameter including at least a second motor torque value that is a torque value of the drive motor; and operating unit configured to, on the basis of the first and second parameters, calculate a zero point hydraulic pressure command value at which the frictional engagement element starts to generate a torque capacity. It is therefore possible to detect a zero point of a clutch between the drive motor and the driving wheel.