ECAS Axle Load Display Calibration via Key Combination
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Solution Overview
Problem
Existing ECAS level control systems for pneumatically sprung vehicles face challenges in calibrating axle load displays, particularly due to non-standardized CAN messages and the risk of accidental activation, leading to potential operating errors.
Innovation Solution
A method is introduced where a specific key combination, including pressing the stop button for a predetermined time, activates the change mode for calibration, preventing accidental activation and allowing precise entry of new values using the raise/lower buttons, with feedback confirmation from the control device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the calibration function is easily accessible through standard interface, then ease of operation is improved, but risk of accidental activation increases
Solution Approach 1:
The patent applies preliminary anti-action by requiring a specific key combination (raising the vehicle level while simultaneously pressing the stop button) to activate calibration mode. This pre-conditions the activation sequence to prevent accidental entry into calibration mode, while still allowing authorized users to access it when needed.
2Measurement precision
If additional hardware or software is added for calibration, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent applies self-service by utilizing the ECAS system's existing level control functionality, height sensors, and CAN communication infrastructure to perform calibration. The control unit uses its own operational data (vehicle level changes, air pressure measurements) to automatically adjust axle load display values, eliminating the need for external calibration equipment, additional sensors, or separate calibration software.
Solution Approach 2:
The patent applies universality by making the ECAS control unit perform multiple functions: it operates as the normal level control system during vehicle operation and simultaneously serves as the calibration system when activated through the specific key combination. The same hardware components (buttons, display, control unit) are used for both normal operation and calibration, eliminating dedicated calibration hardware.
Data Source
AI summary
The invention relates to a method for calibrating the axle load display of an ECAS level control system, comprising at least the following steps: inputting a key combination in the control keys (4) of a control panel (3) of an ECAS control unit (1) for activating the change mode, and inputting change data in the control keys (4) of the ECAS control unit (1). For this purpose, the key combination is preferably free of any keys specifically provided for the activation of the change mode. A key, such as the stop key, is advantageously pressed for a predetermined amount of time. After the input of the key combination, feedback is returned from the ECAS control unit (1), upon which the one or one relevant axles can be selected.