Closed Pedal Deceleration Control via Feedback
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Solution Overview
Problem
Current internal combustion engine control strategies for closed-pedal operation are open-loop, resulting in variable vehicle deceleration profiles dependent on engine, vehicle, and ambient conditions, which affects drivability and consistency.
Innovation Solution
A closed-loop control system that uses sensors and actuators to adjust engine torque and throttle position based on current transmission gear, vehicle speed, and road grade to achieve a desired deceleration profile, allowing for driver selection or automatic calibration according to operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If open-loop control is used for closed-pedal operation, then the system is simple to implement, but the vehicle deceleration profile varies with operating conditions
Solution Approach 1:
The patent implements closed-loop control by measuring actual vehicle deceleration and comparing it to a desired deceleration profile, then adjusting engine torque based on the error signal. This feedback mechanism maintains consistent deceleration characteristics across varying operating conditions while managing system complexity through structured control architecture.
2Stability of the object's composition
If closed-loop control is implemented to achieve consistent deceleration, then deceleration profile consistency is improved, but control system complexity increases
Solution Approach 1:
The system dynamically adjusts engine torque based on real-time operating conditions including vehicle speed, transmission gear, road grade, and ambient temperature. The controller modifies actuator positions and torque commands adaptively to maintain the desired deceleration profile, transforming a static control approach into a dynamic responsive system.
Solution Approach 2:
The patent changes multiple parameters simultaneously including engine torque, throttle position, intake valve timing, and exhaust valve timing to achieve the desired deceleration profile. By adjusting these parameters based on feedback and operating conditions, the system maintains consistent deceleration while managing the complexity through coordinated parameter control.
3Measurement precision
If engine torque is adjusted to control deceleration, then deceleration control precision is improved, but energy efficiency deteriorates
Solution Approach 1:
The system converts the natural engine braking effect, which normally creates pumping losses and energy inefficiency, into a controlled beneficial force. By precisely modulating engine torque to match the desired deceleration profile, the system transforms uncontrolled energy loss into a useful deceleration mechanism that can be optimized for both precision and efficiency.
Data Source
AI summary
A system and method for controlling an internal combustion engine in a vehicle include controlling the engine to achieve a desired vehicle speed/deceleration when the accelerator pedal is released. A desired vehicle deceleration may be determined based on current transmission gear, vehicle speed, and road grade. Vehicle speed/deceleration is measured using a vehicle speed sensor and/or wheel speed sensor(s) and the engine is controlled to reduce the error between the desired and measured decelerations. Electronically actuated intake and/or exhaust valves, and/or an electronically controlled throttle may be used to achieve a desired vehicle deceleration profile. A selector switch or similar device may be used by the driver to select a desired deceleration profile from two or more available profiles and/or a desired deceleration profile may be automatically selected based on current ambient and/or vehicle/engine operating conditions.