Electronic Throttle Control Supercharging Diagnosis
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Solution Overview
Problem
Designing a supercharged engine with electronic throttle control (ETC) poses challenges due to the impact of superchargers on air-fuel control, torque-based control, and potential supercharger degradation issues such as over-boosting or under-boosting, which complicate accurate airflow monitoring and delivery.
Innovation Solution
A drive system incorporating an engine with electronic air throttle control, a supercharger to increase air pressure, and a diagnostic system to detect supercharger over-boosting or under-boosting, using sensors and a controller to manage supercharger engagement and airflow, enabling predictive control and redundancy in case of sensor failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a supercharger is added to increase air delivery to the engine, then engine power and volumetric efficiency are improved, but air-fuel control accuracy deteriorates due to pressure variations
Solution Approach 1:
The system continuously monitors actual airflow using a mass airflow sensor and compares it with expected airflow calculated from throttle position and engine parameters. When discrepancies indicate supercharger degradation (over-boost or under-boost), the controller adjusts fuel injection and throttle positioning to maintain accurate air-fuel control despite pressure variations
Solution Approach 2:
The patent replaces traditional mechanical linkage between accelerator pedal and throttle with an electronically controlled throttle actuator. This electronic system can precisely control throttle blade position and compensate for supercharger-induced pressure changes, maintaining air-fuel control accuracy while enabling the supercharger to increase engine power
2Ease of operation
If electronic throttle control is implemented to enable precise airflow regulation, then ease of operation is improved, but device complexity increases due to additional sensors and control mechanisms
Solution Approach 1:
The electronic throttle control system serves multiple functions: it regulates airflow based on driver input, compensates for supercharger degradation, provides diagnostic information about supercharger health, and works with the diagnostic system to maintain optimal engine performance. This multi-functionality justifies the additional complexity by eliminating the need for separate systems
Solution Approach 2:
The controller acts as an intermediary between the mass airflow sensor, throttle position sensor, and throttle actuator. It processes signals from sensors, calculates expected airflow, detects discrepancies indicating supercharger issues, and adjusts throttle positioning accordingly, simplifying the overall control architecture while maintaining precision
3Productivity
If torque-based control of throttle position is used to optimize engine performance, then productivity is improved, but measurement precision requirements increase due to challenges in accurately monitoring airflow
Solution Approach 1:
The system uses feedback from the mass airflow sensor and throttle position sensor to continuously monitor actual airflow and compare it with expected airflow calculated from torque-based control parameters. This feedback loop enables accurate airflow monitoring even under varying supercharger conditions, supporting optimized engine performance
Solution Approach 2:
The controller pre-calculates expected airflow based on throttle position, engine speed, and load conditions before actual combustion occurs. By having this expected value ready, the system can quickly detect discrepancies indicating supercharger degradation and make real-time adjustments, enabling both productivity optimization and accurate measurement
4Power
If supercharger engagement is increased to maximize power output, then engine power is improved, but reliability decreases due to potential over-boosting or under-boosting degradation
Solution Approach 1:
The diagnostic system continuously monitors actual airflow and pressure to detect supercharger degradation such as over-boost or under-boost conditions. When degradation is detected, the controller adjusts supercharger engagement and throttle positioning to maintain reliable operation, allowing the system to maximize power output while preventing unstable operation
Solution Approach 2:
The system establishes baseline airflow characteristics and expected performance ranges before supercharger degradation occurs. By having these reference values established in advance, the system can detect early signs of degradation and take preventive action, cushioning against potential over-boost or under-boost conditions that would compromise reliability
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
This solution improves engine power and efficiency by accurately regulating airflow and torque, while diagnosing and compensating for supercharger degradation, ensuring continuous system operation and optimal engine performance.
Implementation Method 1
a supercharger configured to selectively increase pressure of the air delivered to the engine
Implementation Method 2
a throttle position sensor to feed throttle-position data to a computer
Implementation Method 3
which can be controlled with a solenoid or similar mechanism
Implementation Method 4
a supercharger diagnostic system configured to diagnose supercharger over-boosting or under-boosting
Data Source
AI summary
A drive system. The drive system includes an engine configured to convert chemical energy into mechanical energy, an electronically-controlled air throttle configured to regulate air delivery to the engine, a supercharger configured to selectively increase pressure of the air delivered to the engine, and a supercharger diagnostic system configured to diagnose supercharger over-boosting or under-boosting.