Variable Compression Ratio Exhaust Brake Valve
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Solution Overview
Problem
Conventional exhaust gas brake systems for heavy vehicles like trucks and buses are complex and costly due to the need for multiple valves and cam profile changes, which complicates the engine brake performance and increases manufacturing costs.
Innovation Solution
A variable compression ratio apparatus with an exhaust control valve that selectively communicates the combustion chamber with the exhaust manifold using a solenoid valve and slider mechanism, allowing for hydraulic pressure control to adjust the compression ratio based on the brake pedal operation, simplifying the system and improving brake performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional exhaust gas brake systems use multiple valves and cam profile changes, then engine brake performance is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of multiple valves and cam profile changes into a single exhaust control valve that operates in conjunction with a variable compression ratio mechanism. This merging of functions reduces the number of components while maintaining the engine brake performance through controlled exhaust gas release and variable compression ratio adjustment.
Solution Approach 2:
The exhaust control valve is designed to perform multiple functions: controlling exhaust gas release for braking, managing compression ratio variation, and coordinating with the solenoid valve system. This multi-functionality eliminates the need for separate dedicated components for each function, thereby reducing overall system complexity.
2Reliability
If conventional exhaust gas brake systems use multiple valves and cam profile changes, then engine brake performance is improved, but manufacturing cost increases
Solution Approach 1:
By merging the functions of multiple valves and cam profile mechanisms into a single integrated exhaust control valve system, the patent reduces the number of parts that need to be manufactured, assembled, and quality-tested. This consolidation directly reduces manufacturing costs while preserving the complex brake performance functions through the unified design.
3Device complexity
If exhaust control valve uses solenoid valve and slider mechanism, then system complexity is reduced, but control precision may be affected
Solution Approach 1:
The patent employs a solenoid valve to control hydraulic or pneumatic pressure, which actuates the slider mechanism for precise exhaust control valve positioning. This fluid-based control system achieves high precision with simpler mechanical components compared to direct mechanical actuation, maintaining control accuracy while reducing overall system complexity.
Solution Approach 2:
The patent replaces complex mechanical linkage systems with a solenoid-actuated hydraulic/pneumatic system. The solenoid valve controls fluid pressure to move the slider, which in turn positions the exhaust control valve. This substitution reduces mechanical complexity while maintaining or improving control precision through fluid power's inherent precision and force multiplication.
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
The solution simplifies the exhaust brake apparatus and enhances brake performance by controlling the compression volume efficiently, reducing manufacturing costs and complexity while maintaining stability and performance.
Implementation Method 1
a solenoid valve disposed at one side of the valve body. The slider may selectively move in the valve body by a hydraulic pressure supplied in the valve body by a solenoid valve
Implementation Method 2
The slider may selectively move in the valve body by a hydraulic pressure supplied in the valve body by a solenoid valve
Data Source
AI summary
A variable compression ratio apparatus of an exhaust gas brake in an engine, may include a piston reciprocally moving in a cylinder of the engine, and an exhaust control valve that selectively communicates a combustion chamber of the cylinder with an exhaust manifold in accordance with pressure generated by the piston in the cylinder to control operating pressure of the piston.