Hybrid Engine Torque Control via Battery State Compensation
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Solution Overview
Problem
Existing methods for controlling part load mode engine torque in hybrid vehicles do not adequately consider battery state information and engine error amounts, leading to over-discharge of the battery and increased fuel consumption.
Innovation Solution
A method and apparatus that dynamically adjust part load mode engine torque limitations based on battery state information and engine error amounts, using a controller to calculate and compensate torque variations to prevent battery discharge and optimize fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the limitation of part load mode engine torque is set to a low value when engine knocks, air intake temperature is high, and atmospheric pressure condition is low, then engine reliability is improved, but fuel consumption increases and the full load area increases
Solution Approach 1:
The patent applies dynamics by making the torque limitation value variable rather than fixed. The controller dynamically adjusts the part load mode engine torque limitation based on real-time battery state information (charge level, temperature, health) and engine operating conditions. This allows the system to optimize the balance between engine reliability and fuel consumption by adapting the torque limitation to current system needs, rather than using a conservative fixed limitation that always prioritizes reliability.
Solution Approach 2:
The patent changes the parameter of torque limitation based on multiple input parameters including battery charge level, battery temperature, battery health, engine knock detection, air intake temperature, and atmospheric pressure. By monitoring these parameters and adjusting the torque limitation accordingly, the system can maintain engine reliability when needed while minimizing fuel consumption when conditions permit, thus resolving the contradiction between reliability and energy efficiency.
2Device complexity
If the limitation of part load mode engine torque is set without considering battery state information, then device complexity is reduced, but the battery may be over-discharged
Solution Approach 1:
The patent implements feedback by continuously monitoring battery state information (charge level, temperature, health) and using this information to adjust the torque limitation. The controller receives feedback from battery sensors and engine sensors, processes this information, and dynamically modifies the part load mode torque limitation accordingly. This feedback mechanism ensures battery reliability is maintained while managing the added complexity through systematic integration of sensor data into the existing control architecture.
3Use of energy by moving object
If the limitation of part load mode engine torque is increased to reduce full load area, then fuel efficiency is improved, but the battery discharge risk increases
Solution Approach 1:
The patent changes the torque limitation parameter dynamically based on battery state information. When battery charge level is high and battery health is good, the system allows higher torque limitation values that reduce the full load area and improve fuel efficiency. When battery charge level is low or battery temperature is high, the system reduces the torque limitation to prevent battery over-discharge. This parameter adaptation resolves the contradiction by allowing the system to optimize fuel efficiency when battery conditions permit while protecting battery reliability when conditions are critical.
Data Source
AI summary
A method and apparatus for controlling part load mode engine torque are provided. The method includes setting a limitation of part load mode engine torque based on a current traveling environment and calculating a first engine torque variation in the basis of state information of a battery. When the first engine torque variation is calculated, a second engine torque variation is calculated based on a measured engine error amount. The limitation of part load mode engine torque is compensated based on the calculated first and second engine torque variations.