Engine Control Torque Management for Launch Shudder
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Solution Overview
Problem
Traditional engine control systems fail to accurately control engine output torque and do not provide rapid responses to control signals, leading to inefficiencies in vehicle launch events, which result in engine speed fluctuations, increased energy input to the clutch, and reduced clutch durability.
Innovation Solution
An engine control system that determines driver torque requests based on accelerator pedal position and transmission speed differences, generating multiple torque requests to adjust engine operating parameters, such as spark timing and fuel injection, to minimize engine speed decreases and reduce shudder during vehicle launch, while optimizing torque production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional engine control systems are used, then the system structure is simple, but the engine output torque control accuracy is poor and response speed is slow
Solution Approach 1:
The control system is divided into multiple independent modules: a driver torque request module that processes accelerator pedal position, a first difference module that calculates target engine speed minus transmission input speed, a second difference module that calculates transmission input speed minus measured engine speed, a request generating module that creates torque requests, and an adjusting module that implements control actions. This segmentation allows each module to perform a specific function with high precision while maintaining overall system manageability
Solution Approach 2:
The system performs preliminary calculations of speed differences before generating torque requests. The first difference (target engine speed - transmission input speed) and second difference (transmission input speed - measured engine speed) are calculated in advance to predict required torque adjustments, enabling faster and more accurate response during vehicle launch events
2Speed
If traditional engine control systems are used, then the device complexity is low, but the response speed to control signals is slow
Solution Approach 1:
The system continuously monitors the second difference between transmission input speed and measured engine speed, using this real-time feedback to adjust torque requests. This closed-loop feedback mechanism enables rapid detection of speed deviations and immediate corrective action, significantly improving response speed during dynamic vehicle launch conditions
Solution Approach 2:
The control system pre-calculates torque requests based on anticipated speed differences before actual deviations occur. By computing the first difference (target engine speed - transmission input speed) in advance, the system prepares corrective torque commands that can be immediately applied when needed, reducing lag in response to control signals
3Reliability
If traditional engine control systems are used, then the control coordination among devices is poor, but the device complexity is lower
Solution Approach 1:
The system merges multiple control functions into a coordinated torque management architecture. The driver torque request module, speed difference calculation modules, and torque request generating module work together as an integrated system that simultaneously considers accelerator pedal position, target engine speed, transmission input speed, and measured engine speed to produce unified torque control commands, ensuring reliable coordination among all affected devices
Solution Approach 2:
The control system employs a universal torque request generating module that can accommodate multiple input parameters and control scenarios. This module processes both the driver's torque request and the speed-based torque adjustments through a unified calculation framework, enabling coordinated control of engine output across various operating conditions including vehicle launch, acceleration, and steady-state operation
Data Source
AI summary
A driver request module determines a driver torque request based on an accelerator pedal position, a first difference between a target engine speed and a transmission input speed, and a second difference between the transmission input speed and a measured engine speed. A request generating module generates first and second torque requests based on the driver torque request. An engine speed control module generates third and fourth torque requests based on a target engine speed and the first and second differences. Based on a mode signal: a first selection module sets a fifth torque request to one of the first and third torque requests; and a second selection module sets a sixth torque request to one of the second and fourth torque requests. An adjusting module selectively adjusts an engine operating parameter based on at least one of the fifth and sixth torque requests.