Engine Control Device Acceleration Response Constraint Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control devices for internal combustion engines fail to ensure acceleration increases when the driver opens the accelerator, as they reach constraints such as torque or smoke emission limits, leading to limited responsiveness and efficiency.
Innovation Solution
A control device that calculates a target acceleration increase amount based on the accelerator opening degree, using relations where the ratio of acceleration increase to accelerator opening degree is adjusted according to the proximity to constraints, allowing for gradual or quick acceleration adjustments to avoid exceeding limits, thereby enhancing responsiveness and reducing fuel consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the target acceleration increase amount is set large to improve responsiveness when the driver increases accelerator opening degree, then the acceleration response is improved, but the operating state reaches constraints (torque or smoke emission limits) causing acceleration to stall
Solution Approach 1:
The patent applies dynamics by making the target acceleration increase amount variable rather than fixed. The control device dynamically adjusts the target acceleration increase amount based on the current operating state and its proximity to constraints. When the operating state is far from constraints, a larger target acceleration increase amount is used for rapid response. When close to constraints, a smaller target acceleration increase amount is used to prevent constraint violation, thus resolving the contradiction between responsiveness and reliability.
Solution Approach 2:
The patent changes the parameter of target acceleration increase amount based on operating conditions. By calculating the current operating state and comparing it with constraint limits, the system adjusts the target acceleration increase amount parameter adaptively. This parameter change allows the system to maintain high responsiveness when safe and prevent constraint violations when near limits, effectively resolving the technical contradiction.
2Reliability
If the target acceleration increase amount is set small to prevent reaching constraints, then constraint violations are avoided, but the acceleration response becomes slow and unresponsive to driver input
Solution Approach 1:
The system dynamically adjusts the target acceleration increase amount based on real-time operating state assessment. When the operating state is far from constraints, the system uses a larger target acceleration increase amount for rapid response. When close to constraints, it switches to a smaller value to ensure compliance. This dynamic adjustment resolves the contradiction between reliability and speed.
Solution Approach 2:
The control device continuously monitors the operating state and uses this feedback to adjust the target acceleration increase amount. By comparing the current state with constraint limits and adjusting the acceleration target accordingly, the system maintains both constraint compliance and responsive acceleration performance.
3Device complexity
If a fixed target acceleration increase amount is used to simplify control logic, then device complexity is reduced, but the system cannot adapt to varying proximity to constraints leading to either constraint violations or poor responsiveness
Solution Approach 1:
The patent changes the control parameter (target acceleration increase amount) based on operating conditions without requiring complex control logic. By calculating the operating state and selecting appropriate target acceleration increase amounts from predefined sets, the system achieves adaptability while maintaining relatively simple control structure, resolving the contradiction between device complexity and adaptability.
Data Source
AI summary
A control device is configured to calculate a basic accelerator request torque based on an accelerator opening degree detected by an accelerator opening degree sensor, and calculate a target acceleration increase amount based on relations between the target acceleration increase amount and an accelerator opening degree increase amount. Further, the control device is configured to calculate a torque increase amount correction amount based on the target acceleration increase amount, calculate a request engine torque based on the basic accelerator request torque and the torque increase amount correction amount, calculate a request injection amount based on the request engine torque, and control a fuel injection valve based on the request injection amount. The relations are such that as a present operating state is close to a constraint, a ratio of the target acceleration increase amount and the accelerator opening degree increase amount becomes smaller.