Hybrid Vehicle Engine Start Inhibition via Accelerator Threshold
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Solution Overview
Problem
In hybrid vehicles, when an engine failure is temporarily resolved, the sudden restoration of engine driving force can cause an uncomfortable feeling for the driver due to increased accelerator pedal depression, as the vehicle transitions back to combined engine and motor power mode.
Innovation Solution
A control system that inhibits the engine start even after abnormality resolution, such as engine or transmission issues, if the accelerator opening is greater than or equal to a predetermined level, to maintain consistent driving force and alleviate driver discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine is automatically restarted after abnormality resolution, then the vehicle can restore full driving force, but the driver experiences uncomfortable feeling due to sudden force addition
Solution Approach 1:
The control device performs preliminary assessment of driver intent by monitoring accelerator opening degree before allowing engine restart. When the accelerator opening exceeds the threshold during abnormality resolution, the control device preliminarily determines that the driver desires strong acceleration and thus prohibits engine restart, preventing the harmful effect of sudden force addition.
Solution Approach 2:
The control device continuously monitors accelerator opening degree and uses this feedback to dynamically adjust engine start prohibition decisions. The feedback loop ensures that engine restart is controlled based on real-time driver input, resolving the contradiction between restoring engine reliability and preventing driver discomfort.
2Object-affected harmful factors
If the engine is prohibited from starting during high accelerator opening, then driver comfort is improved, but engine recovery time is extended
Solution Approach 1:
The control device changes the operational parameters of the engine by implementing conditional start prohibition based on accelerator opening degree. This parameter-based control strategy balances driver comfort with engine recovery timing, allowing the engine to restart sooner under low accelerator conditions while maintaining comfort during high accelerator operations.
Data Source
Figure 1
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Figure 3~4
AI summary
A control system for a hybrid vehicle (1), the control system being provided with an abnormality detection unit (410), a start determination unit (420), and a start control unit (430). The abnormality detection unit detects abnormality in at least one of an engine (10), a first clutch (15), and an automatic transmission (40). The start determination unit determines whether or not to allow the engine (10) to be started, and the start control unit controls to start the engine (10). If an abnormality has been detected by the abnormality detection unit (410), the start determination unit (420) inhibits the start control unit (430) from starting the engine (10), and maintains the inhibition even when the abnormality has been eliminated, when the accelerator pedal opening (APO) is larger than a predetermined value.