Hybrid Vehicle Control System for Vibration Suppression
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Solution Overview
Problem
Hybrid vehicles without a transmission between the engine and electric motor experience vibrations and noise when the engine operates at low rotation speed and high torque, leading to inadequate battery charging rates.
Innovation Solution
A control system with a transmission between the engine, electric motor, and drive wheels, where the controller adjusts the limit charging value based on the speed position to prevent high torque states and maintain appropriate battery charging rates, suppressing vibrations and noise while ensuring optimal battery charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the limit charging value is uniformly tightened to suppress vibrations and noise, then vibrations and noise are reduced, but the charging rate decreases and the battery state of charge cannot be appropriately maintained
Solution Approach 1:
The limit charging value is dynamically adjusted based on transmission speed position rather than being uniformly fixed. When the transmission speed position indicates conditions prone to vibrations and noise, the limit charging value is reduced; otherwise, it is increased to maximize charging efficiency. This dynamic adjustment resolves the contradiction by adapting the charging rate to actual operating conditions.
Solution Approach 2:
The control system changes the parameter of limit charging value based on transmission speed position. By monitoring the speed position and adjusting the limit charging value accordingly, the system optimizes both vibration suppression and charging efficiency without uniform restriction.
2Productivity
If the engine is operated at low rotation speed and high torque to increase charging rate, then the charging rate increases, but vibrations and noise occur
Solution Approach 1:
The control system continuously monitors the transmission speed position and uses this feedback to adjust the limit charging value. When the speed position indicates a high risk of vibrations and noise, the system reduces the limit charging value to prevent the engine from operating in the problematic low-speed high-torque region, while still maintaining adequate charging rates.
3Object-affected harmful factors
If the limit charging value is decreased to prevent engine operation at low rotation speed and high torque, then vibrations and noise are suppressed, but the charging rate is reduced
Solution Approach 1:
Rather than uniformly decreasing the limit charging value, the system dynamically adjusts it based on transmission speed position. This allows the system to suppress vibrations and noise only when necessary (at specific speed positions) while maintaining higher charging rates and better energy efficiency during other operating conditions.
Data Source
AI summary
An upper limit charging rate is limited when a speed position of an automatic transmission is high as compared to when the speed position is low, so an engine is hard to enter a high torque state even when the speed position is high. Thus, it is possible to suppress vibrations and noise that tend to occur at the time when the engine is driven at a low rotation speed and high torque. On the other hand, the upper limit charging rate increases when the speed position is low as compared to when the speed position is high, with the result that a charging rate increases, so it is possible to keep a state of charge of a battery within an appropriate range.