HCCI Engine Torque Assist Control for Expanded Operable Area
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Solution Overview
Problem
Homogeneous Charge Compression Ignition (HCCI) engine and lean burn operation techniques have limited operable areas, leading to combustion instability, increased nitrogen oxide emission, and fuel consumption losses, especially at low and high load conditions.
Innovation Solution
An apparatus and method that utilize a processor to control engine torque based on motor efficiency gain and battery state of charge (SOC) to expand the operable area, enabling torque assist control and power generation control to maintain efficient HCCI operation within predetermined limits, thereby reducing fuel consumption and minimizing mode transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If HCCI engine or lean burn operation is used to improve fuel consumption and reduce emissions, then fuel efficiency is improved, but the operable area is limited causing combustion instability at low load and increased nitrogen oxide emission at high load
Solution Approach 1:
The patent combines HCCI engine operation with a motor (electric motor) to create a hybrid powertrain system. The motor assists the engine during low load conditions where HCCI operates unstably, and the system integrates battery energy management with engine control to expand the effective operable area while maintaining fuel efficiency benefits
Solution Approach 2:
The system dynamically adjusts the operating mode between pure HCCI, HCCI with motor assist, and conventional SI mode based on real-time load conditions, battery state of charge, and efficiency gain calculations. This dynamic adaptation allows the system to maintain optimal performance across a broader range of operating conditions
2Adaptability or versatility
If mode transition from HCCI to SI operation is performed to operate outside the limited operable area, then adaptability is improved, but mode transition shock and fuel consumption loss occur
Solution Approach 1:
The motor serves as an intermediary between HCCI and SI modes, allowing smooth transitions by providing torque assistance during mode changes. This eliminates abrupt mode transition shocks and reduces fuel consumption losses by maintaining optimal operating points during transitions
Solution Approach 2:
The system performs preliminary calculations of efficiency gain and determines optimal transition points before executing mode changes. By anticipating when mode transitions will be beneficial and preparing in advance, the system minimizes fuel consumption losses associated with abrupt transitions
3Productivity
If torque assist control or power generation control is implemented to expand operable area, then system complexity increases, but fuel consumption and mode transitions are reduced
Solution Approach 1:
The motor serves multiple functions: it acts as a torque assist device during low load conditions, a power generator during regenerative braking, and a transition buffer between combustion modes. This multi-functionality reduces the need for separate dedicated systems, thereby limiting the increase in overall system complexity
Data Source
AI summary
An apparatus for controlling an environment-friendly vehicle, a system having the same, and a method thereof are provided. The apparatus includes a processor to perform a control operation to expand an operable area based on a motor efficiency gain and a state of charge (SOC) of a battery in an Homogeneous Charge Compression Ignition (HCCI) operation or a lean burn operation, and a storage to store the motor efficiency gain and the SOC of the battery, which are acquired by the processor.