Engine Torque Control via RPM-Torque Integral Feedback
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Solution Overview
Problem
Traditional engine control systems fail to accurately control engine torque output and respond slowly to control signals, leading to inefficiencies in torque management and coordination among various engine devices.
Innovation Solution
An engine control system comprising integral modules for determining RPM and torque values, a summer module for calculating an RPM-torque integral value, and a torque adjustment module that adjusts desired torque output based on this value, with disabling conditions for specific operational parameters to optimize torque control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional engine control systems are used, then the system structure is simple, but the torque control accuracy is insufficient and response speed is slow
Solution Approach 1:
The control system is divided into multiple independent modules: integral module for calculating accumulated errors, summer module for combining RPM and torque integrals, and torque adjustment module for computing final adjustments. This segmentation allows each module to perform a specific function with high precision while maintaining overall system manageability despite increased complexity
Solution Approach 2:
The system implements closed-loop feedback by continuously comparing desired torque with estimated torque, calculating the difference through integral modules, and using this feedback to adjust torque output. The feedback mechanism ensures accurate torque control by constantly correcting deviations from target values
Solution Approach 3:
The integral modules perform preliminary calculations by accumulating error differences before torque adjustment is applied. This preliminary action allows the system to anticipate required adjustments and prepare correction values in advance, improving response speed and control accuracy
2Speed
If traditional engine control systems are used, then the system is easy to operate, but the response speed to control signals is slow
Solution Approach 1:
The integral modules continuously calculate accumulated errors before torque adjustments are needed, preparing correction values in advance. This preliminary computation enables the system to respond rapidly to control signals by applying pre-calculated adjustments immediately when torque changes are required
Solution Approach 2:
The system dynamically adjusts torque output by continuously updating integral values and torque adjustments based on real-time operating conditions. The dynamic calculation process allows the system to adapt quickly to changing demands while maintaining coordinated control among various engine devices
3Measurement precision
If torque adjustment is always applied, then torque control accuracy is improved, but inefficiencies occur under certain operating conditions
Solution Approach 1:
The system applies torque adjustment selectively rather than continuously, using partial action only when operating conditions warrant it. The disabling module prevents adjustment under specific conditions such as cold startup, high vehicle speed, or when electric motor torque is sufficient, avoiding unnecessary energy consumption while maintaining accuracy when needed
Solution Approach 2:
The system uses pneumatic/hydraulic disabling conditions to determine when torque adjustment should be applied or disabled based on various sensor inputs including temperature, speed, and torque demands. This conditional application optimizes energy efficiency by eliminating redundant adjustments
Data Source
AI summary
An engine control system comprises first and second integral modules, a summer module, and a torque adjustment module. The first integral module determines an engine speed (RPM) integral value based on a difference between a desired RPM and a measured RPM. The second integral module determines a torque integral value based on a difference between a desired torque output for an engine and an estimated torque of the engine. The summer module determines an RPM-torque integral value based on a difference between the RPM and torque integral values. The torque adjustment module determines a torque adjustment value based on the RPM-torque integral value and adjusts the desired torque output and the estimated torque based on the torque adjustment value.