Dynamic Throttle and Shift Mapping for Acceleration Compensation
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Solution Overview
Problem
Traditional linear throttle mapping and fixed shift mapping in vehicles result in undesirable acceleration profiles, including flat acceleration and sudden dips, especially under environmental conditions like high altitude, low barometric pressure, or high temperature, leading to a less satisfactory driving experience.
Innovation Solution
A vehicle acceleration compensation system that dynamically adjusts throttle mapping and shift mapping in real-time based on sensor data, including ambient air pressure, temperature, and humidity, to maintain desired torque values and reduce flat or sudden acceleration periods, using a control unit to update throttle and shift maps and control torque converter lockup conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional linear throttle mapping and fixed shift mapping are used, then the system structure is simple, but the vehicle acceleration responsiveness deteriorates under environmental conditions
Solution Approach 1:
The patent applies dynamics by transitioning from fixed throttle mapping to dynamic throttle mapping that adjusts in real-time based on environmental conditions. The control unit continuously monitors ambient temperature, barometric pressure, and humidity, then dynamically modifies throttle valve position commands to maintain desired acceleration performance across varying operating conditions.
Solution Approach 2:
The patent implements parameter changes by modifying throttle mapping parameters based on environmental inputs. The control unit adjusts throttle valve position percentages corresponding to accelerator pedal positions according to ambient temperature, barometric pressure, and humidity levels, thereby optimizing acceleration responsiveness without requiring complex hardware changes.
2Ease of operation
If fixed shift mapping is used, then the transmission control is simple, but flat acceleration periods occur during gear changes
Solution Approach 1:
The patent applies dynamics by transitioning from fixed shift mapping to dynamic shift mapping that adapts to environmental conditions. The control unit continuously adjusts shift timing and gear selection based on real-time environmental data, preventing flat acceleration periods during gear transitions while maintaining smooth acceleration throughout the driving cycle.
Solution Approach 2:
The patent implements parameter changes by modifying shift mapping parameters including shift timing, gear selection, and torque converter lockup strategies based on environmental conditions. The control unit adjusts these parameters dynamically to eliminate flat acceleration periods and ensure smooth transitions between gears under varying temperature, pressure, and humidity conditions.
3Ease of operation
If grade compensation logic is used to delay upshift, then flat acceleration in higher gear is reduced, but the vehicle may remain in the same gear for too long causing a stuck feeling
Solution Approach 1:
The patent implements parameter changes by dynamically adjusting shift mapping parameters based on environmental conditions rather than using fixed delay logic. The control unit modifies shift timing, gear selection thresholds, and torque converter lockup strategies according to ambient temperature, barometric pressure, and humidity, providing adaptive gear changes that prevent both flat acceleration and stuck gear sensations.
Solution Approach 2:
The patent applies feedback by continuously monitoring environmental conditions and vehicle acceleration performance, then adjusting shift mapping in real-time. The control unit uses feedback from temperature, pressure, and humidity sensors to dynamically optimize gear transition timing, ensuring smooth acceleration continuity while maintaining adaptability to prevent stuck gear feelings.
4Ease of operation
If existing systems inhibit upshifting for a timer duration, then flat acceleration is compensated, but the vehicle remains in fixed gear causing a stuck feeling
Solution Approach 1:
The patent applies dynamics by replacing fixed timer-based upshift inhibition with dynamic environmental condition-based control. The control unit continuously adjusts shift mapping parameters including upshift timing and gear selection based on real-time ambient temperature, barometric pressure, and humidity data, providing adaptive gear changes that maintain acceleration while preventing stuck gear sensations through flexible gear selection.
Solution Approach 2:
The patent implements parameter changes by modifying shift mapping parameters dynamically based on environmental conditions rather than using fixed timer durations. The control unit adjusts upshift timing, gear selection thresholds, and torque converter lockup strategies according to ambient temperature, pressure, and humidity, optimizing both acceleration maintenance and gear selection flexibility simultaneously.
Data Source
AI summary
Disclosed is a vehicle acceleration compensation system, including an accelerator pedal, throttle, and a transmission configured to shift between two or more fixed gears, wherein each gear relates the motor power to a vehicle torque. The system also includes a control unit configured to receive data from one or more sensors. The control unit includes a real-time throttle map relating the accelerator pedal position to the throttle position, such that a given accelerator pedal position directs a corresponding target throttle position, and a real-time shift map relating a desired transmission gear to a current transmission gear, current vehicle speed, and current throttle position, such that a given vehicle speed, given throttle position, and given transmission gear directs a corresponding target transmission gear. In response to sensor data, the control unit updates the throttle map and shift map such that the vehicle torque is altered to produce a desired acceleration value.