Fuel-Injected Independent Rotary Valve Engine for Lower Pumping Losses
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Solution Overview
Problem
Conventional internal combustion engines face inefficiencies due to friction in valve train components, mechanical complexity, and throttling losses, limiting their performance across varying operating conditions.
Innovation Solution
An independent rotary valve engine configuration with a bidirectional servo motor and engine control unit for dynamic control over intake valve timing, replacing conventional poppet valves and camshaft actuation systems, allowing independent control of intake valve closing and synchronized valve actuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional poppet valves with camshaft mechanism are used, then valve actuation is achieved, but mechanical complexity and friction losses increase
Solution Approach 1:
The patent extracts and eliminates the complex valve train components (camshaft, springs, lifters, rockers) from the conventional poppet valve system. Instead, it uses a simple rotary valve mechanism with a single rotating component that directly controls both intake and exhaust valves, dramatically reducing mechanical complexity and associated friction losses.
Solution Approach 2:
The patent merges the functions of multiple separate valve train components into a single integrated rotary valve assembly. The rotary valve simultaneously controls both intake and exhaust flow paths, combining what were previously separate complex mechanisms into one simple rotating component, thereby reducing overall system complexity.
2Ease of operation
If throttle plate is used for power output control, then power modulation is achieved, but pumping losses increase
Solution Approach 1:
The patent removes the traditional throttle plate from the intake manifold and relocates the flow control function directly to the rotary valve mechanism. By controlling the valve opening degree rather than throttling air flow upstream, the system eliminates the pressure drop and associated pumping losses while maintaining power modulation capability.
Solution Approach 2:
The rotary valve acts as an intermediary that directly controls the flow path between the intake/exhaust manifolds and the combustion chamber. This intermediary mechanism provides smooth power modulation without creating the restrictive pressure drop that would occur with a throttle plate, thereby reducing pumping losses.
3Productivity
If variable valve timing systems are added, then volumetric efficiency improves, but mechanical and electromechanical complexity increases
Solution Approach 1:
The patent implements dynamic valve timing control through a motor-driven rotary valve mechanism that can adjust opening and closing events based on engine speed and load conditions. This dynamic adjustment capability improves volumetric efficiency across different operating conditions while using a simpler control architecture compared to traditional electromechanical VVT systems.
Solution Approach 2:
The patent replaces complex electromechanical variable valve timing systems with a motor-driven rotary valve mechanism. This substitution uses electronic control to drive a simple rotary mechanism, achieving variable timing control with reduced mechanical and electromechanical complexity compared to conventional camshaft-based VVT systems.
4Device complexity
If rotary valves are used instead of poppet valves, then construction simplicity and volumetric efficiency improve, but sealing durability under high combustion pressures deteriorates
Solution Approach 1:
The patent employs flexible sealing elements and thin film seals within the rotary valve mechanism that can deform to accommodate high combustion pressures and temperatures. These flexible sealing components maintain reliable seals under harsh operating conditions while preserving the construction simplicity and volumetric efficiency advantages of the rotary valve design.
Data Source
AI summary
A independent rotary valve engine and a method for controlling thereof includes an engine crankcase, a crankshaft located therein, a bidirectional servo motor connected to the engine crankcase, a cylinder block connected to the engine crankcase, and a cylinder head connected to the cylinder block, with a spark plug and a piston linked by a connecting rod to the crankshaft. An intake rotary valve is located within a first channel in the cylinder head, and an exhaust rotary valve is located within a parallel second channel. A pulley connects a servo motor shaft of the bidirectional servo motor to the intake rotary valve. An engine control device, operatively connected to the spark plug and the bidirectional servo motor, generates spark timing signals, receives an engine speed requirement, determines a wide-open throttle position and intake valve closing angle, and generates variable valve timing signals to rotate the servo motor shaft.