Wastegate Valve Control for Vibration Reduction
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Solution Overview
Problem
Existing vehicle control devices fail to maintain the closed state of the wastegate valve effectively during idle reduction control, leading to vibration issues and electromagnetic noise when the engine is restarted, due to power supply interruption to the wastegate actuator.
Innovation Solution
A control device for a vehicle that includes a temporarily stopping unit, an opening degree detector, and a valve controller, which automatically stops the internal combustion engine in motor drive mode and sets a target opening degree for the wastegate valve to a predetermined level, ensuring a non-contact condition is met, preventing the valve from coming into contact with the inner wall and reducing noise and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power supply to the wastegate actuator is stopped during idle reduction control to reduce power consumption, then power consumption is reduced, but the wastegate valve cannot maintain its closed state, causing vibration and electromagnetic noise upon engine restart
Solution Approach 1:
The control device performs preliminary action by closing the wastegate valve before stopping power supply to the actuator during idle reduction control. This ensures the valve maintains its closed state through mechanical means (valve spring force) rather than relying on continuous electrical power, thereby preventing vibration and electromagnetic noise upon engine restart while still achieving power consumption reduction.
2Object-affected harmful factors
If the wastegate valve is fully closed during motor drive mode to prevent contact with inner wall and reduce noise, then noise and electromagnetic interference are reduced, but the valve may not remain closed due to detection errors, causing contact and noise
Solution Approach 1:
The control device applies preliminary anti-action by setting the target opening degree to a value greater than zero (a predetermined opening degree) rather than exactly zero (fully closed). This compensates for potential detection errors and mechanical tolerances, ensuring the valve remains sufficiently closed to prevent contact with the inner wall and reduce noise, while accounting for the maximum expected detection error.
3Reliability
If the target opening degree is set to fully closed (zero) to ensure the valve is completely shut, then the valve should remain closed, but detection errors cause the actual opening degree to become smaller than or equal to fully-closed-state, causing valve contact and noise
Solution Approach 1:
The control device uses preliminary anti-action by setting the target opening degree to a predetermined value greater than zero, which is calculated based on the maximum detection error. This anticipates potential detection failures and ensures the valve maintains a safe closed position that prevents contact with the inner wall, thereby eliminating noise while maintaining reliable valve closure.
4Loss of energy
If the wastegate valve is controlled to fully closed state during motor drive mode, then engine restart vibration is suppressed, but the valve may contact the inner wall due to detection errors, causing electromagnetic noise
Solution Approach 1:
The control device applies preliminary anti-action by setting the target opening degree to a predetermined value greater than zero during motor drive mode. This prevents the valve from contacting the inner wall by maintaining a small clearance, thereby eliminating electromagnetic noise from valve contact while still achieving the primary goal of suppressing engine restart vibration.
Data Source
AI summary
A control device for a vehicle includes an opening degree sensor to detect an opening degree of a wastegate valve disposed in a bypass passage bypassing a turbine. Circuitry is configured to stop an internal combustion engine while the vehicle is driven by a motor in a motor drive mode. The circuitry is configured to calculate a target opening degree of the wastegate valve to be larger than a maximum error between the opening degree detected by the opening degree sensor and an actual opening degree of the wastegate valve. The circuitry is configured to control the wastegate valve such that the opening degree detected by the opening degree sensor is equal to the target opening degree while the vehicle is driven in the motor drive mode.