Vehicle Control Device Switch-Back Braking Force Consistency
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Solution Overview
Problem
Vehicles equipped with single pedal mode accelerating-decelerating operation elements can experience inconsistent states where the depression amount of the accelerator pedal does not match the generated deceleration, leading to an odd driving experience when in a switch-back state.
Innovation Solution
A vehicle running control device with a processor that determines the switch-back state based on current and target driving directions, applying a consistent braking-driving force until the vehicle stops when the accelerator pedal operation is in the braking range, ensuring natural acceleration and deceleration feedback to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the vehicle is in a switch-back state and the accelerator pedal is depressed in the braking range, then the deceleration generated does not match the depression amount, but maintaining a specific braking-driving force until the vehicle stops prevents this mismatch and provides natural driving feedback
Solution Approach 1:
The control device determines in advance whether the vehicle is in a switch-back state by comparing the shift lever position with the actual running direction. When a switch-back state is detected and the accelerator pedal is depressed in the braking range, the system preliminarily sets the braking-driving force to a predetermined value that matches the pedal depression amount, rather than allowing the mismatched deceleration to occur. This preliminary action prevents the inconsistency before it affects the driver.
Solution Approach 2:
The invention changes the braking-driving force parameter from its normally variable state (which would not match pedal depression in switch-back state) to a predetermined fixed value that corresponds to the accelerator pedal depression amount. This parameter change ensures that even in the abnormal switch-back state, the braking force applied to the vehicle matches what the driver expects based on their pedal input, maintaining natural driving feedback.
2Adaptability or versatility
If the vehicle running control device is combined with the vehicle braking system, then the system can cancel switch-back state, but the deceleration does not match the accelerator pedal operation in switch-back state
Solution Approach 1:
The control device dynamically adjusts the braking-driving force based on the vehicle's operational state. When the vehicle is in a normal state, the braking force follows standard control logic. However, when a switch-back state is detected (where the shift lever position contradicts the actual running direction), the system dynamically changes the braking-driving force to a predetermined value that matches the accelerator pedal depression amount. This dynamic adaptation ensures consistent driving feedback regardless of the vehicle's state.
Solution Approach 2:
The vehicle running control device acts as an intermediary between the driver's accelerator pedal input and the vehicle's actual deceleration response. In switch-back state, this intermediary function becomes crucial - it intercepts the command signal, determines that a switch-back state exists, and replaces the mismatched deceleration command with a predetermined braking-driving force that properly matches the driver's input. This intermediary action resolves the inconsistency between pedal operation and vehicle response.
Data Source
AI summary
A vehicle running control device that is provided with an accelerating-decelerating operation element with an operation range inclusive of a driving range and a braking range includes the following. An input-output section that receives various information including information on a direction in which the vehicle is currently running, a determining section that determines whether the vehicle is in a switch-back state, and an acceleration-deceleration control section that controls the vehicle running. When a braking-driving request value for an operation of the accelerating-decelerating operation element is in the braking range and the determining section determines that the vehicle is in the switch-back state, the acceleration-deceleration control section keeps the braking-driving force at a braking-driving force that is applied to the vehicle when a shift range switch request is accepted.