HIL Speed Sensor Emulator Current Output Noise Immunity
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Solution Overview
Problem
Existing speed sensor simulation technologies are less effective in systems prone to electrical noise, as they typically output voltage signals, which can be influenced by noise sources, necessitating a solution for emulating speed sensors with current output to improve reliability and signal integrity.
Innovation Solution
A hardware-in-the-loop (HIL) system employs two flip-flops and voltage-controlled current sources to generate pulse width modulated signals, converting digital outputs into current outputs, thereby reducing noise influence and enabling reliable emulation of speed sensors with current output, suitable for systems with single wire sensors that encode direction in the duty cycle of the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage output sensors are used in HIL systems, then the system is simpler to implement, but the sensor output is more susceptible to electrical noise interference
Solution Approach 1:
The patent changes the output parameter type from voltage to current. The HIL system generates voltage signals that are then converted to current signals through operational amplifiers and current output stages. This parameter transformation makes the sensor output less susceptible to electrical noise, as current signals maintain better signal integrity in noisy environments compared to voltage signals.
2Reliability
If current output sensors are emulated in HIL systems, then noise resistance is improved, but the device complexity increases
Solution Approach 1:
The patent introduces operational amplifiers as intermediary components between the voltage signal generation stage and the current output stage. These op-amps convert the voltage signals from the HIL system into current signals, serving as a mediator that enables current output emulation without requiring complete redesign of the entire HIL system. This intermediary approach manages the complexity increase by using standardized, off-the-shelf components.
3Reliability
If traditional voltage output speed sensors are used, then the implementation cost is lower, but the signal-to-noise ratio deteriorates in noisy environments
Solution Approach 1:
The patent transforms the output parameter from voltage to current, which inherently improves the signal-to-noise ratio in electrically noisy environments. Current output signals are less susceptible to interference and maintain better fidelity. The cost increase is offset by the use of standard operational amplifier components and the elimination of additional noise filtering hardware that would be required for voltage output systems.
Data Source
AI summary
Methods and systems for emulating a speed sensor with current output via a hardware-in-the-loop (HIL) system are described. In one example, the HIL system outputs a voltage signal that is converted into two current signals that may be interpreted into speed and direction information. The current output may decrease signal sensitivity to electrical noise.