Predictive Tachometer Profile for Engine Speed Synchronization
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Solution Overview
Problem
Tachometers in vehicles often exhibit delayed responses due to communication delays between engine speed sensors and the instrumentation panel, leading to a mismatch between the engine speed display and actual engine performance, which can negatively impact the driver's perception of powertrain performance.
Innovation Solution
A predictive tachometer profile is generated by calculating an engine speed offset based on current engine acceleration and accelerator pedal position rate, which is then used to compute a more dynamic representation of engine speed, accounting for delays and improving responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional tachometer signal processing is used, then the system is simple and reliable, but the tachometer response is delayed and out of synchronization with actual engine speed
Solution Approach 1:
The patent applies preliminary action by predicting future engine speed values before they actually occur. The predictive tachometer profile generation uses current engine speed, acceleration, and jerk to calculate anticipated future speeds, effectively showing the tachometer needle where it will be rather than where it currently is. This compensates for processing delays by proactively adjusting the display to match expected future states.
Solution Approach 2:
The patent implements dynamics by making the tachometer display adaptive and variable rather than static. The predictive profile dynamically adjusts based on real-time engine conditions (speed, acceleration, jerk) and driving events (accelerator depression, gear shifts). This creates a living, breathing display that continuously evolves to match predicted engine behavior, transforming a fixed measurement tool into a dynamic prediction system.
2Measurement precision
If predictive tachometer profile generation is implemented, then the tachometer response synchronization is improved, but the device complexity increases
Solution Approach 1:
The patent uses an intermediary approach by introducing a predictive algorithm as a mediator between the raw engine speed sensor data and the tachometer display. This intermediary layer processes the raw data through prediction calculations (using acceleration and jerk) to generate a predictive profile that bridges the gap between actual and displayed engine speed. The intermediary translates complex sensor data into a simplified predictive display value.
Solution Approach 2:
The patent applies parameter changes by modifying the tachometer display parameter from showing actual current engine speed to showing predicted future engine speed. The system changes the fundamental parameter being displayed from a historical/current measurement to a forward-looking prediction. This parameter transformation is achieved by calculating predictive profiles based on current speed, acceleration, and jerk parameters.
3Adaptability or versatility
If multiple delay sources in the signal path are present, then the system integrates multiple functions, but the cumulative delay increases and desynchronization worsens
Solution Approach 1:
The patent applies preliminary anti-action by implementing a predictive compensation mechanism that counteracts the cumulative delays before they fully manifest. The system calculates predictive profiles that anticipate the delayed response, effectively pre-adjusting the display to compensate for known delay sources (sensor processing, CAN bus transmission, instrument panel rendering). This preliminary adjustment neutralizes the desynchronization effect of cumulative delays.
Data Source
AI summary
Methods and systems are provided for generating a predictive tachometer profile at a tachometer of a vehicle. An engine speed offset can be generated based on an engine acceleration and an accelerator pedal position rate. A predictive tachometer profile displayed at the tachometer can then be generated based on the engine speed offset and an actual engine speed.