Multi-Cylinder Piston Engine Starting Cam Integration
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Solution Overview
Problem
Existing multi-cylinder piston engine starting systems require separate control air pipes and custom timing equipment for each cylinder, leading to inefficiencies in space usage, material consumption, and adjustment needs, especially for engines with varying numbers of cylinders.
Innovation Solution
Implementing a cam-operated valve lifting device for each cylinder, where control valves are operated by gas exchange cams, allowing for identical cam usage across different engine configurations and enabling single starting air duct distribution, thus eliminating the need for separate starting cams and reducing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate control air pipes are used for each control valve, then accurate control of starting air injection is achieved, but space consumption and material usage increase
Solution Approach 1:
Multiple control air pipes are merged into a single common control air pipe that supplies control air to all control valves. The control air is distributed through this single pipe to multiple valves, eliminating the need for separate pipes for each valve while maintaining accurate control timing through the cam mechanism.
Solution Approach 2:
A single common control air pipe serves multiple functions by supplying control air to all control valves in the system. This universal pipe replaces multiple dedicated pipes, reducing space consumption and material usage while maintaining the reliability of control air delivery to each valve.
2Measurement precision
If custom timing equipment is designed for each engine configuration, then accurate starting air injection timing is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The gas exchange cam serves multiple functions: it operates the gas exchange valve and simultaneously operates the control valve for starting air injection. This universal cam component eliminates the need for separate custom timing equipment, reducing device complexity while maintaining accurate timing through the cam's profile design.
Solution Approach 2:
The timing functions for gas exchange valve operation and starting air injection control are merged into a single gas exchange cam mechanism. This consolidation reduces the number of separate timing components needed, simplifying the overall device complexity while preserving precise timing control.
3Measurement precision
If separate starting cams are used for each cylinder, then accurate starting air injection timing is achieved, but the need for different cams for different cylinder counts increases manufacturing complexity
Solution Approach 1:
The gas exchange cam is designed to universally operate both the gas exchange valve and the control valve for starting air injection across all cylinders. This single cam design can be used regardless of the number of cylinders in the engine, eliminating the need to design different cams for different engine configurations and greatly simplifying manufacturing.
4Reliability
If multiple separate ducts are used for starting air distribution, then reliable starting air delivery is achieved, but space and material requirements increase
Solution Approach 1:
Multiple separate starting air ducts are merged into a single common starting air duct that distributes starting air to all cylinders. This consolidation reduces material consumption and space requirements while maintaining reliable starting air delivery through the shared duct system.
Solution Approach 2:
A single common starting air duct serves all cylinders, providing universal starting air distribution. This reduces the total quantity of duct material needed compared to having separate ducts for each cylinder, while still ensuring reliable starting air delivery to all required locations.
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 solution provides reliable and accurate control of starting air injection while minimizing space and material requirements, allowing for identical cam profiles to be used across engines with different cylinder counts, enhancing efficiency and practicality.
Implementation Method 1
Each control valve is provided with a starting air cam for operating the control valve. The starting air cam may be an intake cam or an exhaust cam of the engine.
Implementation Method 2
Each control valve is arranged to be operated by a gas exchange cam of the respective cylinder
Implementation Method 3
a single starting air duct connects the pressure medium source to the starting valves
Implementation Method 4
at least one cam-operated valve lifting device for each cylinder of the engine, the valve lifting device being arranged to open a gas exchange valve
Data Source
Figure 1~2
Figure 3
Figure 4
AI summary
The multi-cylinder piston engine (20) comprises at least one cam-operated valve lifting device (4) for each cylinder (19) of the engine (20), the valve lifting device (4) being arranged to open a gas exchange valve (24, 25), and a starting arrangement comprising a pressure medium source (18), at least one starting valve (10) for introducing pressure medium into a cylinder (19) of the engine (20), means (26) for connecting the pressure medium source (18) to the starting valves (10), and a control valve (12) for each cylinder (19) that is provided with a starting valve (10) for controlling the operation of the starting valve (10). Each control valve (12) is arranged to be operated by a gas exchange cam (1) of the respective cylinder (19).