Automatic Transmission Sudden Start Prevention Controller
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Solution Overview
Problem
Automatic transmission vehicles can experience sudden starts due to driver error, particularly when the shift lever is transitioned from neutral or park to drive or reverse while the accelerator pedal is mistakenly used instead of the brake pedal, leading to potentially dangerous situations.
Innovation Solution
A method and apparatus that detect specific conditions to prevent sudden starts by limiting engine torque and engaging the brake when the vehicle is in neutral or park and the accelerator pedal is pressed, using sensors for data collection and a controller to determine if the sudden start condition is met, and releasing these limitations when the accelerator pedal is fully released or a predetermined time has passed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver operates the shift lever from N stage or P stage to D stage or R stage while pushing the accelerator pedal by mistake, then the vehicle can be driven, but a sudden start occurs causing safety hazards
Solution Approach 1:
The control unit applies preliminary anti-action by detecting the sudden start condition (accelerator pedal pressed while shifting from N/P to D/R stage) and immediately limiting engine torque output. This preventive measure counteracts the harmful effect before the vehicle actually starts moving suddenly, thereby maintaining ease of operation while preventing safety hazards.
Solution Approach 2:
The system converts the harmful situation (accidental accelerator pedal pressing during shift) into a beneficial outcome by automatically limiting engine torque and preventing sudden start. The harmful driver error is transformed into a controlled scenario where the vehicle remains stationary or moves smoothly, turning a dangerous mistake into a safe operation.
2Speed
If the driver pushes the accelerator pedal harder to accelerate, then the vehicle acceleration increases, but more dangerous sudden start may be generated
Solution Approach 1:
The control unit implements preliminary anti-action by monitoring the accelerator pedal position and shift stage, and when a sudden start condition is detected (pedal pressed while shifting from N/P to D/R), it immediately limits the engine torque output. This prevents the vehicle acceleration from increasing dangerously, thereby maintaining normal acceleration capability while preventing sudden start hazards.
3Object-affected harmful factors
If the engine torque is limited and brake is operated to prevent sudden start, then safety is improved, but the driver's intended acceleration is restricted
Solution Approach 1:
The system applies dynamics by making the engine torque limitation temporary and conditional. When a sudden start condition is detected, the control unit limits engine torque and operates the brake to prevent sudden movement. However, when the driver releases the accelerator pedal or the situation is corrected, the system automatically releases the torque limitation and brake operation, restoring normal acceleration capability. This dynamic adjustment ensures safety during hazardous conditions while preserving intended acceleration when safe.
4Reliability
If the system continuously monitors accelerator pedal position, shift stage, engine speed, and vehicle speed to detect sudden start conditions, then sudden start prevention accuracy is improved, but device complexity increases
Solution Approach 1:
The control unit implements universality by using a single controller to perform multiple functions: monitoring accelerator pedal position, detecting shift stage changes, measuring engine speed, detecting vehicle speed, determining sudden start conditions, limiting engine torque, and controlling brake operation. This multi-functional approach improves sudden start detection accuracy without significantly increasing device complexity, as one component performs all necessary tasks.
Data Source
AI summary
A method for preventing a sudden start of an automatic transmission vehicle includes detecting data for determining whether a sudden start condition is satisfied; determining whether a shift stage is an N stage or a P stage when an engine runs. Whether the sudden start condition is satisfied is determined based on the data when the shift stage is the N stage or the P stage when the engine runs. An engine torque is limited below a predetermined torque, and a brake is operated when the sudden start condition is satisfied.