Engine Control Device Vibration Suppression Phase Management
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Solution Overview
Problem
Conventional control devices for internal combustion engines fail to effectively suppress vehicle body vibration due to phase differences between the response speeds of intake air density and effective cylinder volume when a vibration component is superimposed on both the throttle valve and intake valve variable mechanism, leading to undesired engine torque variation and inadequate vibration control.
Innovation Solution
A control device that selectively superimposes the vibration component on either the intake air density or the effective cylinder volume based on the frequency of vehicle body vibration, using a controller to adjust the throttle valve and intake valve variable mechanism to achieve a desired engine torque variation and suppress vehicle body vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vibration component is superimposed on both the throttle valve and intake valve variable mechanism, then vehicle body vibration can be suppressed, but a phase difference is created between the vibration components due to response speed differences, causing desired engine torque to be unobtainable
Solution Approach 1:
The control system is segmented into two distinct control paths: one for basic torque control and another for vibration suppression. The vibration component is selectively applied only to the intake valve variable mechanism rather than both control targets, separating the vibration control function from the basic torque control function to avoid phase interference
Solution Approach 2:
The vibration component is applied locally and selectively only to the intake valve variable mechanism control, rather than uniformly to both the throttle valve and intake valve variable mechanism. This localized application ensures that the vibration control effect is achieved without introducing phase differences that would occur if both control targets received the vibration component simultaneously
2Ease of operation
If the vibration component is superimposed on both control targets, then vibration suppression can be achieved, but response speed differences cause phase differences that prevent obtaining desired engine torque
Solution Approach 1:
The controller preliminarily determines the appropriate control target for vibration component application based on the detected vibration frequency. By pre-assessing whether the vibration frequency matches the intake response delay characteristics, the system proactively selects the optimal control path before executing the vibration control, preventing phase differences from occurring in the first place
Solution Approach 2:
The control strategy dynamically changes parameters based on vibration frequency detection. When the vibration frequency indicates a risk of phase difference, the system changes the control parameter by applying the vibration component only to the intake valve variable mechanism instead of both control targets, thereby adapting to the specific operating conditions to avoid timing mismatches
Data Source
AI summary
A control device for internal combustion engine mounted in a vehicle includes a throttle valve provided in an intake passage of the internal combustion engine and capable of changing a cross-sectional area of the intake passage, a variable valve capable of changing opening and closing timings of an intake valve of the internal combustion engine, basic target torque calculation means for calculating a basic target torque of the internal combustion engine according to an operating state of the internal combustion engine, vibration control target torque calculation means for calculating a vibration control target torque of the internal combustion engine to suppress vehicle vibration according to a vibration component of the vehicle, and cylinder intake air amount control means for controlling a cylinder intake air amount by controlling one of the throttle valve and the variable valve according to the vibration control target torque and controlling the other of the throttle valve and the variable valve according to the basic target torque.