Vehicle Sensor Calibration via Output-Line Voltage Switching
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Solution Overview
Problem
Existing methods for calibrating sensors in vehicles after assembly increase complexity due to the need for additional communication pathways, such as dedicated pins or CAN communication channels.
Innovation Solution
The use of existing interfaces between sensors and the electronic control unit (ECU) in vehicles, incorporating a transistor in the sensor interface circuitry to electrically couple the sensor output to ground or a different voltage, and transmitting a calibration code to initiate calibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional communication pathways (dedicated pins or CAN channels) are used for sensor calibration, then calibration capability is improved, but device complexity increases
Solution Approach 1:
The existing sensor output interface is made multi-functional by enabling it to serve both its original purpose (signal output) and calibration initiation. The transistor switch allows the interface to dynamically change its function between normal operation and calibration mode, eliminating the need for dedicated calibration pins or communication channels.
Solution Approach 2:
The calibration initiation function is merged with the existing sensor output interface by using the same physical connection. The transistor switch integrates the calibration control path with the existing output path, combining multiple functions into a single interface structure.
2Ease of operation
If a transistor is added to the sensor interface circuitry to enable calibration, then calibration control is improved, but device complexity increases
Solution Approach 1:
The transistor switch is controlled by the sensor's own processor circuitry based on received calibration commands, making the system self-calibrating without requiring external calibration equipment or complex control circuitry. The sensor interface serves its own calibration needs using minimal additional components.
Data Source
AI summary
Systems, apparatus, and related methods for vehicle sensor calibration are disclosed. An example vehicle includes a sensor including an output; sensor interface circuitry including a transistor, the sensor interface circuitry communicatively coupled to the output; and processor circuitry communicatively coupled to the sensor via the sensor interface circuitry. The processor circuitry is to cause the transistor to activate to electrically couple the output to one of (a) a ground potential or (b) a voltage source associated with a voltage different than a voltage corresponding to an output voltage range of the sensor; and cause a code to be transmitted to the sensor. The sensor is to perform a calibration in response to the electrical coupling of the output to the ground potential or the voltage source and receipt of the code.