Camshaft Adjuster Phase Control for Engine Start
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Solution Overview
Problem
Existing motor vehicle camshaft adjusting devices do not effectively improve the starting behavior of internal combustion engines, as they are largely dependent on the geometric shape of the cam and lack efficient control mechanisms for valve opening angles during engine start-up.
Innovation Solution
A motor vehicle camshaft adjusting device with an open- and/or closed-loop control unit that adjusts the camshaft phase position during engine start-up to a smaller valve opening angle range, utilizing a highly dynamic camshaft adjuster and electromagnetic actuation to optimize valve opening angles independently of the cam's geometric shape, and switches to normal operating mode only after all cylinders have fired and idling speed is reached.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camshaft phase position is adjusted to a smaller valve opening angle range during engine start-up, then the starting behavior of the internal combustion engine is improved, but the device complexity increases due to the need for dynamic phase adjustment mechanisms
Solution Approach 1:
The patent applies dynamics by making the camshaft phase position adjustable during operation. The camshaft adjusting device dynamically changes the valve opening angle range based on operating conditions, specifically using a smaller angle range during engine start-up to improve starting behavior while transitioning to normal geometric shape-defined ranges during regular operation.
Solution Approach 2:
The patent changes the parameter of valve opening angle range dynamically. During engine start-up, the camshaft phase position is adjusted to provide a smaller valve opening angle range, and this parameter is modified based on engine operating conditions to optimize performance at different stages.
2Adaptability or versatility
If the camshaft phase position is dynamically adjusted during engine operation, then the adaptability to different operating conditions is improved, but the control system complexity increases
Solution Approach 1:
The system transitions from a static camshaft phase position determined solely by geometric shape to a dynamic adjustment mechanism that adapts to different operating conditions, including engine start-up, idle, and full-load conditions.
Solution Approach 2:
The patent implements feedback control where the control unit monitors engine operating conditions and adjusts the camshaft phase position accordingly. The system uses feedback from engine operation to modify the valve opening angle range, ensuring optimal performance across different operating states.
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 enhances the starting behavior of internal combustion engines by optimizing valve opening angles, ensuring complete cylinder filling and improved engine starting torque, while maintaining efficient operation in normal modes by dynamically adjusting the camshaft phase position and valve opening ranges.
Implementation Method 1
utilizing a highly dynamic camshaft adjuster and electromagnetic actuation to optimize valve opening angles
Data Source
AI summary
In a motor vehicle camshaft adjusting device which comprises an open- and/or closed-loop control unit for adjusting the camshaft phase position in a normal operating mode to a temporarily intermittently constant phase position, the open- and/or closed loop control unit has an engine start operating mode in which the camshaft phase position is advanced during opening of the valve so as to provide a valve opening angle range which is smaller than a geometric normal opening angle range based on a crankshaft angle range.