Camshaft Phase Adjustment via Exhaust Gas Reflux Detection
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Solution Overview
Problem
Internal combustion engines face challenges in precisely determining the phase between the crankshaft and camshaft, leading to inaccuracies in gas exchange valve operation, which affects efficiency and pollutant emission control due to tolerances, wear, and aging of sensors and phase adjusting devices.
Innovation Solution
A method and device that utilize sensors, such as incremental sensors, to detect the reflux of gas from the exhaust zone into the intake zone, allowing for the determination of a correction value to adjust the camshaft phase accurately, using intake pipe pressure, temperature, or gas type sensors to identify reflux conditions and correct the phase accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensors are used to determine the phase between crankshaft and camshaft, then the phase can be measured, but tolerances and wear in sensor arrangements lead to measurement inaccuracies
Solution Approach 1:
The invention uses feedback by detecting the actual phase through sensors, comparing it with the target phase, and adjusting the camshaft phase accordingly. The control device continuously monitors the phase determination accuracy and modifies the camshaft position to compensate for sensor tolerances and wear, thereby maintaining reliable and accurate phase measurement over time.
Solution Approach 2:
The system performs self-calibration by using the detected phase information to automatically adjust its own operation. The control device uses the sensor measurements to determine correction values and adjust the camshaft phase without external intervention, compensating for sensor drift and wear through self-correcting phase adjustments.
2Productivity
If the camshaft phase is adjusted using a phase adjusting device, then gas exchange control is improved, but sensor wear and aging result in errors in the determined phase
Solution Approach 1:
The control device continuously monitors the phase between crankshaft and camshaft using sensors and compares the measured phase with the desired phase for optimal gas exchange. Based on this feedback, the system adjusts the camshaft position to maintain accurate phase alignment, compensating for sensor wear and ensuring sustained gas exchange efficiency.
Solution Approach 2:
The invention dynamically changes the phase parameter by adjusting the camshaft position based on detected phase errors. The control device modifies the camshaft phase angle in real-time to compensate for measurement inaccuracies, thereby maintaining optimal gas exchange parameters despite sensor degradation.
3Device complexity
If incremental sensors are used for phase determination, then the device complexity is reduced, but tolerances in sensor arrangement cause inaccurate phase assignment
Solution Approach 1:
The invention uses feedback to compensate for the inherent inaccuracies of incremental sensors. The control device continuously measures the actual phase position, compares it with the target position, and adjusts the camshaft to correct any deviations, thereby maintaining accurate phase assignment despite the simplicity and tolerances of incremental sensors.
Solution Approach 2:
The invention replaces complex mechanical phase setting mechanisms with a sensor-based detection and electronic control system. By using incremental sensors combined with electronic phase adjustment and feedback control, the system achieves accurate phase determination without requiring high-precision mechanical arrangements.
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
Enables precise control of the internal combustion engine by accurately determining and correcting the phase, optimizing operating conditions to minimize pollutant emissions and improve efficiency.
Implementation Method 1
the reflux of gas from the outlet zone into the intake zone is identified as a function of an intake pipe pressure
Implementation Method 2
the reflux of gas from the outlet zone into the intake zone is identified as a function of a temperature of the gas in the intake zone
Implementation Method 3
a gas type sensor is assigned to the internal combustion engine in the outlet zone, whose measurement signal is representative of the absence or presence of exhaust gases
Data Source
AI summary
The invention concerns a method and a device for determining an internal combustion engine phase. Said device comprises an intake zone, an exhaust zone, at least one camshaft which acts on the gas exchanging valves and whereof the phase can be adjusted relative to that of a crankshaft by means of a phase adjusting device, and at least one sensor whereof the measurement signal enables a specific phase to be determined. The phase adjusting device is controlled in accordance with phase adjustment of the camshaft until detection of a gas reflux from the exhaust zone to the intake zone. A correction value is determined based on the associated specific phase and on a specific allocated phase. In the next operating mode, the respectively specific phase is corrected based on the correction value.