Hybrid Vehicle Deceleration Control for Motor Load Limiting
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Solution Overview
Problem
In hybrid vehicles, restricting fuel cut to maintain high deceleration can increase the load on the motor, leading to potential overheating and inefficiencies.
Innovation Solution
A control device that includes a deceleration control unit, fuel cut control unit, traveling mode selection unit, and deceleration limit unit to manage deceleration by restricting or permitting fuel cut based on conditions, and limiting deceleration in specific modes to balance motor load and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If fuel cut is restricted to maintain high deceleration, then deceleration performance is improved, but motor load increases
Solution Approach 1:
The patent applies dynamics by making the deceleration limit adjustable based on motor temperature conditions. When motor temperature is high, the deceleration limit is reduced to lower motor load; when temperature is normal, higher deceleration is permitted. This dynamic adjustment resolves the contradiction between maintaining high deceleration performance and preventing excessive motor load.
Solution Approach 2:
The patent changes the deceleration parameter based on motor temperature conditions. By monitoring motor temperature and dynamically adjusting the deceleration limit parameter, the system optimizes the balance between deceleration performance and motor protection, resolving the technical contradiction.
2Power
If fuel cut is restricted, then deceleration is reduced, but motor load increases
Solution Approach 1:
The system dynamically adjusts the relationship between fuel cut restriction and deceleration limit based on motor temperature. When motor temperature is high, both fuel cut is restricted and deceleration limit is reduced together, maintaining a balanced operational state that prevents excessive motor load while preserving adequate deceleration capability.
3Temperature
If deceleration limit is reduced to suppress motor load, then motor overheating is prevented, but deceleration performance decreases
Solution Approach 1:
The patent implements dynamic adjustment of deceleration limits based on real-time motor temperature monitoring. When motor temperature exceeds thresholds, the deceleration limit is reduced to prevent overheating; when temperature is within normal range, the limit is increased to maintain deceleration performance. This resolves the contradiction by making the system adaptive to thermal conditions.
Solution Approach 2:
The system uses feedback from motor temperature sensors to continuously adjust the deceleration limit. The feedback loop monitors motor temperature and automatically modifies deceleration parameters accordingly, ensuring optimal balance between motor protection and vehicle performance without manual intervention.
Data Source
AI summary
A control device for a hybrid vehicle includes a deceleration control unit configured to control an engine and a motor as traveling power sources so as to control deceleration of the hybrid vehicle, a fuel cut control unit configured to restrict or permit fuel cut in the engine based on establishment or non-establishment of a predetermined condition, a traveling mode selection unit configured to select either a first traveling mode or a second traveling mode requiring deceleration higher than deceleration of the first traveling mode, and a deceleration limit unit configured to limit deceleration in restricting the fuel cut and in selecting the second traveling mode so as to be lower than deceleration in permitting the fuel cut and in selecting the second traveling mode.