Hybrid Vehicle Drive Force Control for Low Particulate Emissions
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Solution Overview
Problem
Existing driving force control systems for hybrid vehicles restrict engine output during particulate matter regeneration, preventing the generation of required driving force while increasing exhaust emissions.
Innovation Solution
A driving force control system that includes a controller to shift operating modes between hybrid and motor modes based on the state of charge of the electric storage device and particulate matter accumulation, restricting engine power when accumulation is low to reduce exhaust gas flow and emissions, while ensuring required driving force is maintained through assist torque from the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If engine output is restricted during particulate matter regeneration to reduce exhaust emissions, then particulate matter emission is reduced, but the engine cannot generate the required driving force
Solution Approach 1:
The patent dynamically adjusts the operating mode threshold level based on the accumulated particulate matter amount. When particulate matter accumulation is small, the threshold is set higher to restrict engine operation and reduce emissions. When accumulation exceeds a predetermined amount, the threshold is lowered to allow engine operation for regeneration, thus dynamically adapting to different operational conditions to balance emissions and driving force requirements
Solution Approach 2:
The system changes the parameter of operating mode threshold level according to the amount of accumulated particulate matter. By varying this threshold parameter, the control strategy transitions between motor mode and hybrid mode, thereby controlling engine output to match the current needs for either emission reduction or driving force generation
2Power
If the operating mode threshold level is set low to allow engine operation for driving force, then required driving force is achieved, but exhaust emissions increase
Solution Approach 1:
The system dynamically adjusts the operating mode threshold level based on real-time monitoring of particulate matter accumulation. When accumulation is within acceptable limits, the threshold is raised to favor motor mode and reduce emissions. When accumulation exceeds limits, the threshold is lowered to enable hybrid mode for regeneration, thus dynamically responding to emission levels
Solution Approach 2:
The control system uses feedback from the particulate matter accumulation amount to adjust the operating mode threshold level. The accumulation amount serves as feedback information that triggers threshold adjustment, creating a closed-loop control system that automatically balances emission reduction and driving force requirements
Data Source
AI summary
A driving force control system for a hybrid vehicle configured to prevent an increase in emission while achieving a required driving force in a condition where an accumulation of particulate matter on a particulate filter is small. A controller is configured to set a threshold level of an SOC level of a battery to shift from a motor mode to a hybrid mode to a higher level and set an upper limit power of an engine in the hybrid mode to a lower power, in a situation where the amount of particulate matter accumulated in a GPF is equal to or smaller than a predetermined amount.