Hydraulic Pressure Sensor Linearity Error Learning for Clutch Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The linearity error in hydraulic pressure sensors for hybrid electric vehicles' engine clutches makes it difficult to control the engagement degree of the engine clutch, affecting power performance and fuel consumption.
Innovation Solution
A method and apparatus for learning the linearity error of hydraulic pressure sensors, involving generating learning commands based on measured hydraulic pressures, calculating moving average error values, and applying correction values to correct the linearity error, with control by a controller and solenoid valve, while considering gear stages and threshold values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the linearity error of the hydraulic pressure sensor is not corrected, then the device complexity remains low, but the control precision of engine clutch engagement deteriorates
Solution Approach 1:
The patent applies preliminary action by performing linearity error learning and correction before normal clutch operation. The ECU learns the relationship between voltage and hydraulic pressure during a dedicated learning period when the clutch is in a known state, storing correction values that are then applied during normal operation to compensate for sensor errors without adding physical correction components.
Solution Approach 2:
The patent implements feedback by continuously monitoring the voltage from the hydraulic pressure sensor and comparing it against learned correction values. The ECU adjusts the clutch control based on the corrected pressure information, creating a closed-loop system that compensates for sensor linearity errors through software-based feedback rather than hardware modifications.
2Measurement precision
If the learning command is generated for an extended period, then the linearity error correction accuracy is improved, but the response time of the clutch control deteriorates
Solution Approach 1:
The learning process is performed in advance during a dedicated learning period before normal clutch operation begins. This preliminary action allows the system to gather sufficient data for accurate linearity error correction without delaying the actual clutch control operations, as the learned values are stored and applied immediately after learning completes.
Solution Approach 2:
The patent implements periodic action by structuring the learning process as a distinct phase that occurs at specific intervals or under specific conditions (such as during vehicle startup or when the clutch is in a neutral state). This periodic learning approach allows the system to balance accurate correction gathering with timely response to actual clutch control needs.
3Measurement precision
If the learning command is generated frequently, then the correction value accuracy is improved, but the energy consumption of the solenoid valve increases
Solution Approach 1:
The learning command is generated periodically rather than continuously, at predetermined time intervals or under specific conditions such as when the vehicle is stationary or the clutch is in a known state. This periodic generation allows the system to update correction values sufficiently for accuracy while avoiding continuous solenoid activation that would waste energy during normal driving operations.
Solution Approach 2:
The patent applies partial action by performing learning only when necessary - during specific conditions such as vehicle startup, gear shifts, or when the clutch is in a neutral state. Rather than continuously generating learning commands, the system performs partial learning cycles that provide sufficient correction accuracy while minimizing solenoid valve activation and associated energy consumption during active clutch engagement.
Data Source
AI summary
A method and an apparatus for learning linearity error of a hydraulic pressure sensor for a hydraulic clutch are disclosed. An apparatus for learning linearity error of a hydraulic pressure sensor for a hydraulic clutch may include: a gear stage sensor detecting a gear stage that is currently engaged; a controller executed by a predetermined program to learn the linearity error of the hydraulic pressure sensor based on signals of the gear stage sensor and the hydraulic pressure sensor; and a solenoid valve applying hydraulic pressure for learning the linearity error of the hydraulic pressure sensor to the hydraulic clutch based on a learning command of the controller.