Vehicle Control Device for Simultaneous Pedal Operation
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Solution Overview
Problem
The immediate execution of driving power limiting processes when the accelerator and brake operating members are simultaneously operated can lead to unintended vehicle deceleration and compromised drivability, particularly due to accidental simultaneous operation, resulting in longer braking distances and complex brake operations for the driver.
Innovation Solution
A vehicle control device that executes the driving power limiting process after a predetermined time following simultaneous operation of the accelerator and brake operating members, with a controller setting a target deceleration based on vehicle speed and brake operation amount to ensure controlled deceleration and reduce the need for excessive brake operation by the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving power limiting process is executed immediately after simultaneous operation of the accelerator and brake operating members, then the driving power is rapidly reduced, but the braking distance increases and drivability deteriorates
Solution Approach 1:
The controller executes a gradual change process before the driving power limiting process to prepare the vehicle for deceleration. This preliminary action involves gradually reducing driving power over a predetermined period, allowing the vehicle and driver to adapt before the full power limitation takes effect, thereby preventing sudden deceleration that would increase braking distance
Solution Approach 2:
The controller dynamically adjusts the driving power reduction strategy based on the simultaneous operation detection. Instead of a fixed immediate reduction, the system implements a two-stage dynamic process: first a gradual reduction over a predetermined period, then the full driving power limiting process, optimizing the balance between rapid deceleration and braking distance
2Loss of time
If the driving power limiting process is executed immediately, then the response time is reduced, but unintended deceleration occurs due to accidental simultaneous operation
Solution Approach 1:
The controller performs a preliminary detection phase where it identifies simultaneous operation of the accelerator and brake operating members and initiates a gradual power reduction process before executing the full driving power limiting process. This preliminary action prevents immediate execution that could cause unintended deceleration from accidental operations
Solution Approach 2:
The controller continuously monitors the operation states of the accelerator and brake operating members, detecting simultaneous operation and adjusting the driving power control strategy accordingly. This feedback mechanism ensures that the driving power limiting process is executed appropriately based on actual driver input patterns, preventing unintended deceleration
3Reliability
If the determination process and gradual change process are executed before the driving power limiting process, then drivability is maintained, but the execution time is delayed
Solution Approach 1:
The determination process and gradual change process are executed as preliminary actions before the main driving power limiting process. This sequencing ensures that drivability is maintained through gradual adaptation while still achieving the ultimate power limitation goal, balancing reliability with eventual response
Data Source
AI summary
When an accelerator pedal and a brake pedal are being simultaneously operated, an electronic control unit executes a driving power limiting process, in which the driving power is set less than that when only the accelerator pedal is operated. The electronic control unit executes the driving power limiting process after a predetermined time has elapsed from when simultaneous operation of the accelerator pedal and the brake pedal is performed. If the accelerator pedal and the brake pedal are simultaneously operated, the electronic control unit sets a target deceleration of the vehicle based on the vehicle speed before the start of the driving power limiting process and the operation amount of the brake pedal and then controls the driving power during execution of the driving power limiting process such that the deceleration of the vehicle matches the target deceleration.