Vehicle Powertrain Control for Reacceleration Response
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Solution Overview
Problem
Conventional automatic transmission systems experience increased response delay during reacceleration due to engine output characteristics that are inadequate when shifting gears based solely on driving tendency, leading to insufficient driving force output.
Innovation Solution
A vehicle power train control apparatus comprising an output characteristics changing section, an operation mode determining section, and a control section that adjusts engine output characteristics to increase driving force during reacceleration by changing fuel cutoff control maps based on driving operation modes, specifically the reacceleration response mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If gear shift control is changed according to driving tendency to maintain low gear ratio, then reacceleration responsiveness is improved, but engine output characteristics become inadequate causing response delay
Solution Approach 1:
The patent applies dynamics by making the engine output characteristics changeable based on driving tendency. The ECU dynamically adjusts engine output characteristics (such as fuel injection amount, ignition timing) according to detected driving patterns, allowing the engine to provide adequate power output during reacceleration while maintaining the low gear ratio selected based on driving tendency.
Solution Approach 2:
The patent changes engine output parameters (fuel injection amount, ignition timing, throttle opening) based on driving tendency detection. When reacceleration is detected, the ECU modifies these parameters to enhance engine power output, resolving the contradiction between maintaining low gear ratio for responsiveness and providing adequate engine power.
2Device complexity
If gear shift control is based solely on predetermined map, then control simplicity is maintained, but adaptability to different driving tendencies is lost
Solution Approach 1:
The patent implements feedback by detecting actual driving tendency through sensors (accelerator position, vehicle speed, braking operation, steering angle) and using this information to adjust gear shift control and engine output characteristics. The ECU continuously monitors driving patterns and modifies control strategies accordingly, providing adaptability while maintaining relatively simple control architecture.
Solution Approach 2:
The patent applies preliminary action by detecting driving tendency in advance and pre-adjusting gear shift control and engine output characteristics before reacceleration occurs. When the system detects patterns indicating upcoming reacceleration (such as maintaining low accelerator position during deceleration on winding roads), it prepares the powertrain accordingly to ensure responsive acceleration when needed.
Data Source
AI summary
A vehicle power train control apparatus is provided that basically comprises an output characteristics changing section, an operation mode determining section and a control section. The output characteristics changing section changes engine output characteristics of a vehicle with respect to an operation of an accelerator pedal. The operation mode determining section determines an operation mode of the vehicle among a plurality of operation modes including at least a reacceleration response mode based on driving information of the vehicle. The control section controls the output characteristics changing section to change the engine output characteristics under a reduced accelerator position state during the reacceleration response mode to increase a driving force upon reacceleration of the vehicle when an accelerator position is increased after the vehicle was decelerated.