Hybrid Vehicle Turbocharger Torque Response Delay
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Solution Overview
Problem
Hybrid vehicles with internal combustion engines and forced induction devices face delays in torque response due to the delay in boost pressure response, which existing technologies have not effectively mitigated.
Innovation Solution
A hybrid vehicle configuration that includes an internal combustion engine with a forced induction device, a rotating electric machine, and a planetary gear mechanism, where the controller initially decreases the engine's rotation speed and increases torque by boosting suctioned air, allowing more efficient air introduction and pressure increase, thereby reducing torque response delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the rotation speed of the internal combustion engine is increased to increase torque output, then the torque generation speed increases, but the air introduction efficiency decreases and torque response delay increases
Solution Approach 1:
The controller performs preliminary action by initially decreasing the engine rotation speed before increasing it to the target speed. This preliminary decrease allows the forced induction device to build up boost pressure in advance, so that when the engine speed increases, the air supply is already sufficient, preventing torque response delay.
Solution Approach 2:
The controller changes the operating parameters of the engine by temporarily adjusting the rotation speed downward and then upward. This parameter change strategy allows the forced induction device to respond appropriately, optimizing both torque output and response time by controlling the sequence and rate of parameter changes.
2Stress or pressure
If the rotation speed of the internal combustion engine is decreased to improve air introduction efficiency, then the air pressure in cylinders increases, but the torque output decreases
Solution Approach 1:
The controller uses preliminary action by temporarily decreasing engine rotation speed to build up cylinder pressure and boost pressure before increasing the speed to the target level. This ensures that when full power is needed, the air supply system is already prepared, allowing high torque output without response delay.
Solution Approach 2:
The controller implements periodic action by first decreasing rotation speed, then increasing it to the target speed. This two-stage periodic control allows the system to optimize air introduction efficiency first, then maximize torque output, resolving the contradiction between pressure buildup and power generation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances torque generation efficiency by increasing pressure in the engine's cylinders and utilizing the electric machine's power to boost torque, effectively reducing the delay in torque response.
Implementation Method 1
The internal combustion engine includes a forced induction device that boosts suctioned air to be fed to the internal combustion engine
Implementation Method 2
a rotating electric machine; a planetary gear mechanism to which the internal combustion engine, the rotating electric machine, and an output shaft are connected
Data Source
AI summary
A vehicle includes an engine, a first MG, a planetary gear mechanism to which the engine, the first MG, and a counter shaft are connected, and an HV-ECU configured to control the engine and the first MG. The engine includes a turbocharger that boosts suctioned air to be fed to the engine. The HV-ECU controls the engine and the first MG to initially decrease the engine's rotation speed and simultaneously increase torque that the engine generates when on a map indicating a relationship between the engine's rotation speed and torque generated by the engine the controller shifts a first operating point to a second operating point at which torque generated by the engine and the rotation speed of the engine are higher than at the first operating point and the turbocharger boosts suctioned air.