Auxiliary Braking Force Control via Accelerator Pedal Position
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Solution Overview
Problem
Existing auxiliary braking devices in vehicles change abruptly from deceleration to acceleration when the accelerator pedal is pressed, leading to frequent acceleration/deceleration cycles, increased fuel consumption, and discomfort for the driver, especially on flat roads and mountainous terrain.
Innovation Solution
An auxiliary braking device with a vehicle electronic control unit connected via CAN communication to other control units, an auxiliary brake switch position detection device, and an accelerator pedal pressing amount measurement device, allowing for determination and adjustment of braking force based on accelerator pedal position, enabling smooth transitions and reducing the need for repeated pedal operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the auxiliary braking device is not operated during accelerator pedal operation, then the device construction is simple, but the vehicle experiences frequent acceleration/deceleration cycles and increased fuel consumption
Solution Approach 1:
The auxiliary braking force is made dynamically adjustable based on accelerator pedal position. The system transitions from a static on/off braking mode to a dynamic mode where braking force varies continuously with pedal input, allowing smooth acceleration/deceleration transitions and reducing frequent cycling
Solution Approach 2:
The braking force parameter is changed from a fixed binary state (on/off) to a variable parameter that changes continuously with accelerator pedal position. This parameter change enables proportional braking control, reducing abrupt transitions and frequent cycling
2Device complexity
If the auxiliary braking device is not operated during accelerator pedal operation, then the control logic is simple, but the vehicle produces sudden acceleration shocks and discomfort
Solution Approach 1:
The system applies auxiliary braking force in advance during accelerator pedal operation to cushion the sudden acceleration transition. By maintaining braking force while the pedal is pressed, the system prevents abrupt changes from deceleration to acceleration, reducing shock and discomfort
Solution Approach 2:
The auxiliary braking device acts as an intermediary force during accelerator pedal operation, mediating the transition between deceleration and acceleration states. This intermediary braking force smooths the transition and prevents direct, abrupt acceleration shocks
3Use of energy by moving object
If the auxiliary braking device operates during accelerator pedal operation, then the fuel efficiency improves, but the device requires complex electronic control systems
Solution Approach 1:
The vehicle ECU is given multiple functions: it controls both the auxiliary braking device and integrates accelerator pedal position information to determine braking force. This multi-functionality eliminates the need for separate dedicated control hardware, reducing overall system complexity while enabling sophisticated braking control
Solution Approach 2:
The system uses existing sensors (accelerator opening sensor) and existing control infrastructure (vehicle ECU, CAN communication) to control the auxiliary braking device. By making the existing system serve multiple purposes, no additional dedicated control components are needed
Data Source
AI summary
The purpose of the present invention is to provide an auxiliary braking device of a vehicle which obtains braking force corresponding to the amount of pressing of an accelerator pedal even during an operation of the auxiliary braking device and prevents frequent repetition of the acceleration and deceleration, to attain a fuel saving operation. Therefore, in the present invention, a vehicle electronic control unit (10) and other electronic control units (20, 30) are provided, the vehicle electronic control unit (10) and the other electronic control units are connected with each other by an in-vehicle communication system (L123), and an auxiliary brake switch position detection device (5S) that detects a switch position of an auxiliary brake switch (5) and an accelerator pedal pressing amount measurement device (4S) that measures the amount of pressing of the accelerator pedal (4) are provided.