Electric Cam Phaser Control for Deceleration Fuel Cutoff
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Solution Overview
Problem
Hydraulically actuated cam phasers in engines are unable to adjust their position when pressurized oil is not available, leading to suboptimal engine operation, while electric cam phasers lack precise control over phase angles during deceleration fuel cutoff events.
Innovation Solution
An electric cam phaser control system comprising a motor driver module, a target phase angle module, and a correlation control module that adjusts the camshaft phaser based on crankshaft and camshaft positions, allowing for precise phase angle control before and during deceleration fuel cutoff events, and correlates crankshaft positions with predetermined ranges to ensure correct installation and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electric cam phasers are used to enable position adjustment without pressurized oil, then the ability to adjust position is improved, but precise control over phase angles during deceleration fuel cutoff events deteriorates
Solution Approach 1:
The control system continuously monitors the actual camshaft position and compares it to the target phase angle, then adjusts the electric motor accordingly. This closed-loop feedback mechanism ensures precise phase angle control during deceleration fuel cutoff events while maintaining the ability to park at non-default positions.
Solution Approach 2:
The system pre-calculates target phase angles for different operating conditions including deceleration fuel cutoff events. By preparing target values in advance based on predicted engine states, the system ensures precise control is maintained during transient conditions when fuel cutoff occurs.
2Productivity
If electric cam phasers are parked at non-default positions to optimize engine operation, then engine efficiency is improved, but system complexity increases
Solution Approach 1:
The electric motor serves multiple functions: it can park the cam phaser at non-default positions for optimized engine operation, adjust phase angles during deceleration fuel cutoff events, and maintain precise control across various operating conditions. This multi-functionality reduces the need for separate mechanisms for each function.
Solution Approach 2:
The control system automatically determines optimal phase angles and adjusts the cam phaser position based on real-time engine operating conditions without requiring manual intervention. The system self-regulates to maintain optimal efficiency across different工况 while managing its own control complexity.
Data Source
AI summary
A system for an engine includes a motor driver module, a target phase angle module, and a correlation control module. The motor driver module controls an electric motor of a camshaft phaser based on a target angle defined by a crankshaft position and a camshaft position. The target phase angle module selectively sets the target angle to a first phase angle before a deceleration fuel cutoff (DFCO) event and selectively transitions the target angle to a predetermined phase angle during the DFCO event. The correlation control module selectively compares a value of the crankshaft position with a predetermined crankshaft position range during the DFCO event.