Engine Intake Valve Timing Control for Rapid Torque Response
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing control systems for internal combustion engines are not responsive enough to rapid changes in torque demand due to the time required to determine new valve opening and closing schedules, leading to delayed adjustments in engine operation.
Innovation Solution
A control system that receives real-time torque demand signals and dynamically adjusts the intake valve opening and closing schedules, allowing for immediate updates to optimize torque generation and fuel injection timing based on changing demands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the control system determines valve timing parameters during each power stroke preceding the intake stroke, then the determination is completed before the intake valve needs to open, but the system cannot respond rapidly to new torque requests received after determination
Solution Approach 1:
The control system performs valve timing parameter determination during the power stroke that precedes the intake stroke, completing calculations in advance before the intake valve needs to open. This preliminary action ensures all necessary parameters are ready while leaving the system capable of receiving new torque requests after determination but before valve actuation.
Solution Approach 2:
The system dynamically adjusts its operation based on when torque requests are received. If a new torque request arrives after determination but before the intake stroke, the system can still implement the new parameters by executing them during the upcoming intake stroke, rather than waiting for the next full cycle.
2Measurement precision
If the control system waits for the next combustion cycle to implement new torque requests, then parameter determination is thorough and accurate, but vehicle responsiveness to driver input is delayed
Solution Approach 1:
The control system completes parameter determination during the preceding power stroke, having all calculations ready before the intake stroke begins. This preliminary computation ensures accuracy while enabling immediate implementation during the upcoming intake stroke rather than waiting a full cycle.
Solution Approach 2:
When a new torque request is received, the system rushes to implement the new parameters during the current upcoming intake stroke rather than waiting for the next full combustion cycle, thereby skipping the usual one-cycle delay and improving responsiveness.
Data Source
AI summary
A control system for controlling operation of an internal combustion engine is configured to: receive a first request signal indicative of first torque demand; determine a schedule defining an opening timing of the intake valve and a closing timing of the intake valve of a cylinder of the internal combustion engine in dependence on the first torque demand; and cause the intake valve to open in accordance with the schedule. The control system is also configured to, during a period in which the intake valve is open: receive a second torque request signal indicative of a second torque demand different to the first torque demand; determine an updated schedule defining an updated closing timing of the intake valve in dependence on the second torque demand; and cause the intake valve to close in accordance with the updated schedule.