Valve Control Device Voltage Prediction for Actuator Responsiveness
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Solution Overview
Problem
The existing valve timing control devices for internal combustion engines experience decreased responsiveness due to prolonged time in obtaining necessary energization when power source voltage drops, leading to inefficiencies in actuator activation.
Innovation Solution
An intake/exhaust valve control device that includes a voltage state predicting unit to set energization conditions based on predicted power source voltage, ensuring timely and adequate energization for the driving unit, and optionally incorporates power consumption prediction to enhance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage of the power source decreases greatly after the start of energization of the electromagnetic actuator, then it takes a longer time until the amount of energization necessary for driving the electromagnetic actuator is obtained, but the responsiveness of the electromagnetic actuator decreases remarkably
Solution Approach 1:
The control device starts energizing the electromagnetic actuator before the actual valve switching timing is reached. By anticipating the voltage drop and starting energization early, the system ensures that the necessary energization amount is accumulated in advance, allowing the actuator to respond promptly when needed despite low voltage conditions.
Solution Approach 2:
The control device dynamically adjusts the energization timing based on the detected voltage state. When low voltage is detected, the system automatically advances the energization start timing, creating a dynamic adaptation mechanism that maintains actuator responsiveness across varying voltage conditions.
2Reliability
If the voltage of the power source is low, then the energization amount is insufficient, but starting energization earlier compensates for voltage drop
Solution Approach 1:
The control device performs preliminary energization by starting the energization process before the actual valve switching timing. This advance action allows the electromagnetic actuator to accumulate sufficient energization amount even when the power source voltage is low, ensuring reliable operation without compromising the timing requirements.
3Device complexity
If the energization condition is set based on the present voltage state, then the control is simple, but it cannot secure the amount of energization at appropriate timing when voltage drops
Solution Approach 1:
The control device incorporates voltage state detection that provides feedback to the control unit. Based on this feedback about the actual voltage conditions, the system automatically adjusts the energization timing, ensuring that sufficient energization is delivered at the appropriate time while maintaining a relatively simple control structure.
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 approach secures the necessary energization for the driving unit at appropriate times, maintaining responsiveness even during low voltage states, thus preventing delays in valve operation and reducing the need for large-capacity batteries.
Implementation Method 1
an electromagnetic actuator for holding the intake/exhaust valve
Data Source
AI summary
An intake/exhaust valve control device for an internal combustion engine including a cylinder having an intake valve and an exhaust valve includes: solenoids for driving at least one of the intake valve and the exhaust valve; a battery for supplying an electric current to the solenoids, a battery state predicting unit for predicting the voltage state of the battery; and an energization start timing setting unit for setting the current carrying start timing of the battery with respect to the solenoids based on the result of the prediction by the battery state predicting unit. According to the intake/exhaust valve control device, since it is possible to obtain the amount of energization necessary for driving the solenoids at an appropriate timing, it is possible to secure the responsiveness of the solenoids.