Hybrid Engine Stall Prevention via Predicted Speed Estimation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current engine stall prevention systems are ineffective in detecting a critical reduction in engine speed in a timely manner, leading to insufficient assistance from auxiliary motors to prevent engine stalling.
Innovation Solution
A method that estimates the rotation speed of the main engine using predicted instantaneous speed calculations, defines an intervention zone between minimum speeds, and activates the auxiliary motor early enough to prevent stalling by using two pulleys and a drive belt for assistance, allowing for precise monitoring and timely intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the average speed is monitored to detect critical reduction in engine speed, then the system can identify potential stalling conditions, but the detection is too slow to enable timely intervention by the auxiliary motor
Solution Approach 1:
The system calculates predicted instantaneous speed at future crankshaft positions (e.g., next top dead center) before the actual stalling occurs. This preliminary calculation allows the control system to activate the auxiliary motor in advance, ensuring timely intervention. The method uses current speed measurements and acceleration trends to project future speed values, enabling proactive rather than reactive stall prevention.
Solution Approach 2:
The patent introduces an intermediate calculated parameter (predicted instantaneous speed at predefined crankshaft position) that bridges the gap between current average speed measurements and future actual speed conditions. This intermediary value allows the system to anticipate stalling conditions before they manifest in the average speed data, providing sufficient lead time for auxiliary motor activation.
2Reliability
If the auxiliary motor is activated based on average speed reduction, then the system provides assistance, but the activation occurs too late to effectively prevent engine stalling
Solution Approach 1:
The control system determines when to activate the auxiliary motor by comparing predicted instantaneous speed against threshold values before the actual speed drop occurs. The auxiliary motor is activated in advance based on predicted future conditions rather than waiting for actual stalling to be detected in average speed data, ensuring reliable and timely intervention.
Solution Approach 2:
The system takes preliminary anti-action by activating the auxiliary motor before the stalling condition fully develops. By predicting future speed values and comparing them against minimum thresholds, the system prevents the harmful stalling effect from occurring in the first place, rather than attempting to correct it after detection.
3Speed
If the system uses current instantaneous speed for control decisions, then the response is immediate, but there is insufficient time for the auxiliary motor to intervene effectively
Solution Approach 1:
The system calculates predicted instantaneous speed at future crankshaft positions (e.g., one engine cycle ahead) to provide sufficient lead time for auxiliary motor activation. This preliminary calculation maintains immediate response characteristics while ensuring the auxiliary motor has adequate time to intervene before stalling occurs.
Solution Approach 2:
The control system dynamically adjusts the timing of auxiliary motor activation based on predicted future speed conditions rather than reacting to current speed measurements. This dynamic approach allows the system to optimize the activation moment, ensuring both rapid response and sufficient intervention time for reliable stall prevention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method effectively prevents engine stalling by ensuring the auxiliary motor intervenes before a critical speed reduction, maintaining engine rotation and optimizing chances of prevention.
Implementation Method 1
an auxiliary electric motor for assisting the main engine by means of two pulleys and a drive belt
Implementation Method 2
assisting the rotation of the crankshaft of the main engine
Implementation Method 3
by means of two pulleys and a drive belt
Data Source
AI summary
A method prevents the stalling of the engine of a hybrid vehicle (1) equipped with an auxiliary motor (4) and wheels (R1 to R4), pistons (2a to 2d), tank (3), axle (5), drive shaft (6), gearbox (7), connections (8a, 8b), and computer (9). The method uses an estimate of the predicted instantaneous speed of the main engine (2) at its next top dead center, for the purpose of assisting the main engine in a stall situation, via the auxiliary motor which can supply sufficient power to it on a one-off basis to prevent it from stopping. The method defines two levels of instantaneous speed. If the predicted instantaneous speed is located in the intervention zone between the two levels, the auxiliary motor assists the rotation of the main engine to enable it to rotate in the same direction, without stalling.