Vehicle Gearshift Control for Speed Bump Acceleration Timing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional gearshift control technologies face challenges in predicting and executing smooth acceleration after a speed bump, leading to delayed acceleration and high calculation loads due to insufficient physical time for downward gearshifts and reliance on driver input.
Innovation Solution
A gearshift control apparatus and method that utilize sensors to measure vehicle speed and road gradient, calculate deceleration, and determine a correction factor to perform preliminary and secondary gearshifts, optimizing gearshift stages for enhanced performance and reducing acceleration delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional gearshift control calculates predicted acceleration when driver manipulates brake, then gearshift control is performed, but physical time for downward gearshift is insufficient causing delayed acceleration
Solution Approach 1:
The control unit performs a preliminary gearshift to a preliminary shift stage before the vehicle actually needs to accelerate, based on predicted travel data and road gradient. This preliminary action prepares the transmission in advance so that when acceleration is needed, the gearshift is already complete or nearly complete, eliminating the delay between brake release and acceleration.
Solution Approach 2:
The gearshift process is divided into multiple stages: a preliminary gearshift to a preliminary shift stage, and then a final gearshift to the target shift stage. This segmentation allows the transmission to begin shifting early while still having time to complete the final adjustment when acceleration is actually required, effectively extending the available time for gearshift completion.
2Measurement precision
If conventional gearshift control calculates predicted acceleration based on first travel data, then gearstage is determined, but calculation load is high
Solution Approach 1:
The control unit extracts and utilizes specific key parameters (road gradient, vehicle speed, accelerator pedal position) from the available data, rather than performing comprehensive calculations on all possible travel data. This extraction approach maintains prediction accuracy while significantly reducing the computational load required for gearshift control.
Solution Approach 2:
The control unit uses stored map data containing road gradient information as a reference copy, comparing it with actual sensor data to determine predicted travel characteristics. This copying approach from pre-stored information reduces real-time calculation requirements while maintaining prediction accuracy.
3Ease of operation
If driver manipulates accelerator pedal during downward gearshift, then acceleration is requested, but acceleration is delayed until gearshift finishes
Solution Approach 1:
The control unit initiates a preliminary gearshift action before the driver actually presses the accelerator pedal, based on detected brake release or other predictive criteria. This preliminary action ensures the transmission is already shifting or has shifted to the appropriate stage when the driver requests acceleration, eliminating the delay between driver input and vehicle response.
Solution Approach 2:
The control unit continuously monitors driver input (accelerator pedal position, brake status) and adjusts the gearshift timing and stages accordingly. This feedback mechanism allows the system to anticipate driver intentions and coordinate gearshift completion with the desired acceleration moment, improving both responsiveness and smoothness.
Data Source
AI summary
A gearshift control apparatus of a vehicle includes: a sensor configured to measure a speed, a brake position sensor (BPS) value, and an accelerator position sensor (APS) value of the vehicle, and a controller configured to, in a gearshift section spaced apart by a preset distance from a speed bump located on a road on which the vehicle travels, (i) calculate a deceleration of the vehicle and a gradient of the road after the speed bump, (ii) determine a correction factor corresponding to the deceleration of the vehicle and the gradient of the road, and (iii) perform a gearshift to a shift stage corresponding to the correction factor and the speed of the vehicle.