Vehicle Drive Control Neutral Shift Adaptation
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Solution Overview
Problem
When a driver switches the shift position from a non-driving to a driving position while the accelerator is on, there is a risk of the vehicle starting unexpectedly, causing an uncomfortable experience due to mismatched vehicle behavior and operation intentions.
Innovation Solution
A drive control apparatus that executes a drive force restriction process, reducing the prime mover's output when switching from a non-driving to a driving position with the accelerator on, and adjusts the reduction mode based on the continuation time of the neutral position, ensuring a moderate start and preventing uncomfortable feelings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driver operates the accelerator to an on state before switching the shift position from a non-driving position to a driving position, then the vehicle can start quickly, but the drive force is transmitted to the wheels unexpectedly causing an uncomfortable feeling
Solution Approach 1:
The control unit detects when the accelerator is operated to an on state before shift position switching, and preemptively restricts drive force transmission by reducing the transmission gear ratio or interrupting power transmission. This preliminary counter-action prevents the harmful effect of unexpected vehicle movement while preserving the driver's intended quick start capability.
Solution Approach 2:
The control unit dynamically changes the transmission system parameters (gear ratio, power transmission state) based on the detected operation sequence. When abnormal operation is detected (accelerator on before shift switch), the system adjusts transmission parameters to reduce or interrupt drive force, thereby eliminating the uncomfortable feeling while maintaining engine operation.
2Object-affected harmful factors
If the drive force is restricted when switching from non-driving to driving position with accelerator on, then the uncomfortable feeling is suppressed, but the vehicle start response is delayed
Solution Approach 1:
The control unit dynamically adjusts the drive force restriction level based on real-time detection of operation sequences and vehicle conditions. The restriction is applied selectively and temporarily only during the abnormal transition period, then automatically released, thereby minimizing time loss while maintaining comfort safety.
Solution Approach 2:
The system automatically detects the abnormal operation sequence and self-regulates the drive force restriction without requiring driver intervention. Once the shift position is properly switched to driving position, the system automatically releases the restriction, restoring normal vehicle performance without manual input from the driver.
Data Source
AI summary
A drive control apparatus for a vehicle includes: a control unit that controls drive force output from an engine in accordance with operation of an accelerator pedal; and a shift mechanism capable of selectively switching a shift position to a driving position or a non-driving position. The shift mechanism transmits the drive force to wheels when the shift position is in the driving position, and interrupts transmission of the drive force when the shift position is in the non-driving position. The control unit executes a drive force restriction process of reducing the drive force when the shift position is switched from the non-driving position to the driving position while the accelerator pedal is in an on state, and, when the switching is from a neutral position, the control unit changes a mode of reducing the drive force in accordance with a continuation time of the neutral position.