Vehicle Gear Prediction for Cornering Load Energy Saving
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Solution Overview
Problem
Existing vehicle energy saving control methods fail to account for changing external road conditions, particularly turning resistance, leading to power output mismatches and energy waste when a vehicle passes a corner.
Innovation Solution
A method that calculates an equivalent mass based on the curvature radius of a corner, vehicle speed, and road friction coefficient to determine a predicted gear position, allowing the multi-power switch to adjust gear positions in advance to match power output with the environment, thereby reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional load-based gear switching is used, then the gear position matches the current vehicle load, but the power output does not match when turning due to unaccounted cornering resistance
Solution Approach 1:
The system obtains road information (curvature radius) ahead of the vehicle and calculates equivalent mass in advance before the vehicle actually enters the corner. This preliminary calculation allows the multi-power switch to be switched to the predicted gear position before the turning resistance occurs, ensuring power output matches the actual load conditions when the corner is reached.
Solution Approach 2:
The patent introduces an intermediary calculation of equivalent mass that converts the complex effect of cornering resistance into an equivalent load mass. This intermediary parameter bridges the gap between road geometry (curvature radius) and engine load requirements, allowing the existing load-based control system to account for turning resistance without requiring fundamental redesign.
2Speed
If the multi-power switch is switched in real-time based on current load, then the switching responds to current conditions, but the delay causes power gear position to not match road situation
Solution Approach 1:
The system performs gear switching in advance based on predicted load conditions rather than waiting for real-time load changes. By calculating the predicted gear position based on upcoming corner curvature and switching before the actual cornering occurs, the system compensates for the inherent switching delay and ensures accurate power matching when the cornering resistance actually applies.
3Adaptability or versatility
If gear switching occurs frequently due to changing road conditions, then the system adapts to road changes, but fuel is wasted during the switching delay period
Solution Approach 1:
By predicting the required gear position based on upcoming road geometry and switching in advance, the system eliminates the period of mismatched power output that would otherwise occur during switching delay. This reduces unnecessary fuel consumption during transitions while maintaining adaptability to changing road conditions.
Data Source
AI summary
Disclosed in the present disclosure is a vehicle energy saving control method, comprising: switching a multi-power switch to a corresponding gear position according to an actual load value and a load threshold; obtaining road information of a corner ahead when the vehicle is driving, wherein the road information comprises a curvature radius; calculating equivalent mass according to the curvature radius, total mass, a speed of the vehicle and a road friction coefficient; determining a predicted gear position according to the sum of the actual load value and the equivalent mass; and switching the multi-power switch to the predicted gear position if the predicted gear position is different from the current gear position. The present disclosure can solve the problem of energy waste caused by the power output mismatch when the vehicle passes the corner.