Engine Control Apparatus for Dynamic Valve Phase Adjustment
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Solution Overview
Problem
Existing engine control systems face challenges in accurately controlling engine brake strength, leading to excessive deceleration feel for drivers and reduced regeneration efficiency in hybrid vehicles, due to issues with valve timing and compression ratio management during engine brake operations.
Innovation Solution
An engine control apparatus that utilizes a valve drive device capable of independently setting the phases of multiple intake valves, with a controller adjusting these phases based on the required engine brake magnitude to optimize valve timing and compression ratio, thereby controlling the engine brake strength more precisely.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the phase of intake valves is independently adjusted to strengthen engine brake, then the deceleration effect is enhanced, but the regeneration efficiency in hybrid vehicles is reduced
Solution Approach 1:
The patent applies dynamic control by making the valve phase adjustment variable based on operating conditions. The controller dynamically changes the phase of intake valves according to the magnitude of engine brake required, transitioning between different phase configurations to optimize both brake strength and regeneration efficiency under varying conditions.
Solution Approach 2:
The patent changes the timing parameter (phase) of intake valve operation to control engine brake characteristics. By adjusting the phase angle of intake valves independently, the system modifies the compression ratio and gas flow characteristics to achieve desired brake strength while maintaining regeneration capability.
2Force
If the phase of intake valves is retarded to increase engine brake, then the negative load on engine is increased, but the driver experiences excessive deceleration feel
Solution Approach 1:
The system dynamically adjusts valve phase based on real-time operating conditions and required brake magnitude, providing a controlled and comfortable deceleration experience rather than excessive or abrupt braking.
Solution Approach 2:
The controller receives feedback about the magnitude of engine brake required and adjusts the intake valve phase accordingly, creating a closed-loop control system that optimizes brake strength while maintaining driver comfort.
3Quantity of substance
If the intake valve closes late in compression stroke to reduce compression ratio, then the gas amount is reduced, but the expansion stroke becomes excessive
Solution Approach 1:
The patent changes the timing parameter (phase) of intake valve closure to control the amount of gas in the cylinder during compression, thereby adjusting the effective compression ratio and matching expansion stroke duration to the reduced gas amount.
Data Source
AI summary
An ECU 70A is associated with an engine 1 provided with a VVT 30 capable of independently setting a phase of an intake valve 2A and a phase of an intake valve 2B of two intake valves 2 mounted for a combustion chamber E. The ECU 70A includes a controller control the VVT 30 based on a magnitude of engine brake required to the engine 1 to vary a phase of at least one of the intake valves 2A and 2B.