Vehicle Control System Optimizing Fuel Consumption and Torque
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Solution Overview
Problem
Conventional vehicle control systems face challenges in optimizing fuel consumption and torque management across multiple auxiliaries like air conditioners and generators, as existing technologies lack effective methods for cooperative control and evaluation of overall trade-offs between fuel efficiency and performance.
Innovation Solution
A vehicle control system that includes an engine control device and an auxiliary control device, capable of estimating and selecting drive patterns based on fuel consumption rate calculations using characteristic data, to optimize fuel efficiency and torque distribution across multiple auxiliaries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the compressor is stopped to store cold energy in the cold energy storage unit, then fuel consumption is reduced, but torque loss occurs during deceleration
Solution Approach 1:
The system stores cold energy in the cold energy storage unit in advance by operating the compressor before deceleration occurs. This preliminary energy storage allows the compressor to be stopped during deceleration without compromising cooling needs, thereby reducing torque loss while maintaining fuel efficiency
Solution Approach 2:
The system dynamically adjusts the speed reducing ratio of the continuously variable transmission based on real-time conditions. When the compressor stops during deceleration, the transmission control device increases the speed reducing ratio to compensate for the torque loss, optimizing the balance between fuel consumption and vehicle performance
2Device complexity
If multiple auxiliaries are controlled independently, then control simplicity is maintained, but overall fuel consumption optimization is insufficient
Solution Approach 1:
The system merges the control of multiple auxiliaries (compressor, alternator, etc.) into a unified cooperative control framework. The engine control device receives requests from multiple auxiliary control devices and coordinates their operation based on overall fuel consumption optimization, achieving synergistic energy management
Solution Approach 2:
The engine control device serves multiple functions: it controls the engine operation, manages multiple auxiliary devices, calculates fuel consumption for different drive patterns, and selects optimal control strategies. This multi-functional approach enables comprehensive fuel optimization without proportionally increasing system complexity
3Force
If the speed reducing ratio is increased to compensate for torque loss, then torque deficiency is corrected, but fuel consumption increases
Solution Approach 1:
The system dynamically adjusts the speed reducing ratio based on real-time vehicle conditions and auxiliary operation states. The transmission control device increases the speed reducing ratio only when the compressor stops during deceleration, and returns it to normal when the compressor operates, minimizing the impact on fuel consumption while compensating for torque loss only when necessary
Data Source
AI summary
A vehicle control system includes an engine control device, an auxiliary control device adapted to control an auxiliary driven by power of an engine, a device for estimating a plurality of drive patterns for controlling the auxiliary, a fuel consumption rate relating value calculation device, and a selection device. The fuel consumption rate relating value calculation device calculates fuel consumption rate relating values of the engine required to drive the auxiliary by the engine according to the respective estimated plurality of drive patterns by use of characteristic data of the engine. The selection device selects a single drive pattern for driving the auxiliary based on the estimated plurality of drive patterns by use of the calculated fuel consumption rate relating values.