Hybrid Vehicle Controller Dynamic Surge Torque Threshold
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Solution Overview
Problem
Hybrid vehicles face challenges in controlling engine torque to improve exhaust emissions while minimizing the adverse effects of surge torque on vehicle behavior, which has not been effectively addressed in existing technologies.
Innovation Solution
A controlling device that calculates and sets an allowed surge torque value based on the engine torque proportion, using a controller to adjust ignition timing, valve overlap, and air-fuel ratio to restrict surge torque within a safe range, thereby enhancing exhaust performance without compromising vehicle behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the engine proportion of torque is reduced to improve exhaust performance, then emissions are improved, but surge torque adversely affects vehicle behavior
Solution Approach 1:
The patent applies dynamics by making the surge torque threshold dynamic rather than fixed. The threshold is adjusted based on the current operating conditions including engine torque proportion, vehicle speed, and accelerator opening. When engine torque proportion is low, a higher surge torque threshold is allowed, and when engine torque proportion is high, a lower threshold is applied. This dynamic adjustment enables the system to improve emissions during low-engine-load conditions while maintaining vehicle behavior stability during high-engine-load conditions.
Solution Approach 2:
The patent changes the parameter of surge torque threshold based on engine torque proportion and other operating parameters. By calculating the engine torque proportion continuously and adjusting the allowed surge torque value accordingly, the system optimizes the balance between emissions and vehicle behavior. The controller modifies combustion parameters such as ignition timing and air-fuel ratio to control surge torque within the dynamically determined threshold.
2Object-generated harmful factors
If lean air-fuel ratio and retarding ignition time are used to increase surge torque for exhaust performance, then emissions are improved, but vehicle behavior deteriorates
Solution Approach 1:
The system dynamically adjusts the surge torque threshold based on real-time operating conditions. When the engine torque proportion is low, the system allows greater surge torque and can apply more aggressive emission control strategies such as leaner air-fuel ratios and retarded ignition timing. When engine torque proportion increases, the threshold is reduced to prevent vehicle behavior deterioration, thus dynamically optimizing the trade-off between emissions and reliability.
Solution Approach 2:
The controller continuously monitors engine operating parameters including torque proportion, vehicle speed, and accelerator opening, and uses this feedback to adjust the surge torque threshold and combustion control strategies. This closed-loop feedback mechanism ensures that emission control actions are taken only when they will not adversely affect vehicle behavior, maintaining reliability while improving emissions.
Data Source
AI summary
This invention relates to a hybrid vehicle controlling device and method of using the device, in which an engine torque proportion (which is transmitted from an engine to a driving shaft) of a total sum of torque transmitted to the driving shaft is calculated. An allowed surge torque value, which is an upper limit of a surge torque allowed to the engine, is set to a larger value as the engine torque proportion is reduced. Then a predetermined parameter of the engine is changed so that the engine is controlled in a range in which the surge torque of the engine does not go beyond the allowed surge torque value.