Crankshaft Sensor Signal Processing for Engine Restart
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Solution Overview
Problem
The existing crankshaft sensor processing systems face challenges in accurately determining the angular position and speed of an internal combustion engine upon restart, especially when the last square waveform before stopping is backwards-running, leading to imprecision and a requirement for a 3-square waveform wait, which delays engine responsiveness and driver experience.
Innovation Solution
A processing module simulates and transmits a backwards-running and then a forwards-running square waveform to the processing device, allowing the system to assume a forwards-running scenario, thereby eliminating the need for a 3-square waveform wait and improving restart precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the system waits for 3 square waveforms after engine stop to ensure position precision, then measurement precision is improved, but loss of time increases due to delayed engine restart
Solution Approach 1:
The processing module performs preliminary actions by simulating square waveforms before the actual restart occurs. When a backwards-running waveform is detected, the system proactively generates corrective simulated waveforms to pre-establish the proper angular position state, eliminating the need to wait for 3 actual waveforms after restart and thus reducing restart delay while maintaining position precision
2Reliability
If the system systematically waits for 3 square waveforms after engine stop, then reliability is improved by avoiding control errors, but productivity decreases due to delayed injection and ignition operations
Solution Approach 1:
The processing module creates copies of square waveforms through simulation. When a backwards-running waveform is detected, it generates simulated waveforms that replicate the expected forward-running pattern, allowing the system to immediately proceed with control operations without waiting for actual waveforms, thus maintaining reliability while improving responsiveness
Data Source
AI summary
Disclosed is a method for processing signals from a crankshaft sensor including the following steps: detection of a stopping of the engine; simulation and transmission of a backwards-running square waveform; and simulation and transmission of a forwards-running square waveform. Also disclosed is a processing module configured to implement such a method.