Vehicle Drive Control Device Accelerator Shift Logic
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Solution Overview
Problem
Drivers experience a strange sensation and reduced drivability when they inadvertently switch the shift mechanism from a non-drive position to a drive position with the accelerator already in the ON state, leading to unexpected vehicle startup.
Innovation Solution
A drive control device that executes a drive force limiting process to decrease the drive force output from the drive source when the shift mechanism is switched from a non-drive position to a drive position with the accelerator in the ON state, adjusting the limiting degree based on vehicle acceleration and traveling speed to prevent strange sensations and maintain drivability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver operates the accelerator from OFF to ON state before switching the shift mechanism from non-drive position to drive position, then the vehicle can start quickly, but the driver experiences a strange sensation and drivability decreases
Solution Approach 1:
The control section detects the unusual operation pattern (accelerator ON before shift to drive position) and applies counter-action by limiting the drive force output. This preliminary anti-action prevents the strange sensation from occurring in the first place, allowing quick startup while maintaining drivability through proactive intervention
2Reliability
If the drive force is reduced to prevent vehicle movement when accelerator depression exceeds detection level, then safety is improved, but the strange sensation is not prevented and drivability is lowered
Solution Approach 1:
The control system dynamically adjusts the drive force limitation based on real-time detection of operation patterns. Rather than using a fixed reduction level, the system applies adaptive control that responds to the specific condition of accelerator-on-before-shift operation, maintaining safety while preserving drivability through dynamic adjustment
3Ease of operation
If the drive force limiting process is applied when shift mechanism is switched from non-drive position to drive position with accelerator in ON state, then the strange sensation is prevented, but the drive force output is decreased
Solution Approach 1:
The drive force limitation is applied locally and selectively only to the specific unusual operation pattern (accelerator ON before shift to drive position), rather than globally limiting all drive force output. This localized application preserves drivability during the problematic operation while maintaining normal power output for all other legitimate driving conditions
Data Source
AI summary
When a driver attempts to hurriedly start driving a stopped vehicle, for example, the driver may, without realizing it, begin operating an accelerator pedal before shifting a shift lever from a non-drive position to a drive position. In such a situation, when the shift lever is shifted from a non-drive position to a drive position while the accelerator pedal is being operated, a drive power limiting process is implemented for limiting the drive power when the drive power is output from a drive source in accordance with the amount that the accelerator is being operated. As a result, when the shift lever is shifted from a non-drive position to a drive position in the abovementioned manner, it is possible to restrict starting of the vehicle, which is caused by the transmission of drive power from the drive source to the wheels. This reduces the strange sensation experienced by the driver.