Starting Valve Timing Control for Piston Engine Air Consumption
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Solution Overview
Problem
Large multicylinder piston engines face challenges in synchronizing gas exchange valves and starting gas supply timing, leading to high consumption of compressed air, which requires significant storage and production space.
Innovation Solution
A pressure medium operated starting system with a pipe system, starting valves, control valves, and timing equipment that adjusts the opening timing and period of the starting valve based on engine position, using a control part with guide surfaces and power unit to minimize air consumption by optimizing the introduction of pressure medium during engine start-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If compressed air is supplied to start large multicylinder piston engines, then the engine can be started, but the consumption of starting air becomes excessively high
Solution Approach 1:
The control part is made movable in the direction of its axis of rotation by a power unit, allowing dynamic adjustment of guide surface engagement. This enables the system to adapt the opening timing and period of starting valves dynamically during the start-up process, optimizing air consumption while ensuring reliable engine starting
Solution Approach 2:
The system changes the opening moment and/or opening period of starting valves as parameters during start-up. By adjusting these parameters based on engine speed (especially above limit speed), the system minimizes air consumption while maintaining starting capability
2Quantity of substance
If compressed air storage and production equipment is increased to meet high air demand, then sufficient starting air is available, but the space required increases significantly
Solution Approach 1:
The system applies partial action by supplying compressed air only when and where needed during the start-up sequence. By controlling opening timing and period of individual cylinder valves based on engine position and speed, air is supplied partially rather than continuously to all cylinders, reducing total air consumption and thus the required storage capacity
3Reliability
If the opening period of starting valves is extended to ensure reliable starting, then starting reliability improves, but pressure medium consumption increases
Solution Approach 1:
The system uses periodic action by supplying pressure medium in controlled intervals rather than continuously. The control part's periodic engagement with different guide surfaces at various engine positions creates rhythmic opening/closing of starting valves, providing reliable starting while limiting total air consumption through periodic rather than sustained supply
Data Source
Figure 1
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AI summary
A pressure medium operated starting system (1) for a multicylinder piston engine comprising a pressure medium source (2) and a pipe system (4), which connects the pressure medium source to each cylinder (3), and a starting valve (7) in conjunction with each cylinder as well as timing equipment (10) for the operation of control valves, which timing equipment comprises a control part, which is in mechanical connection with the rotating part (15) of the engine. The timing equipment (10) comprises means (10.1, 10.2, 14; 47, 49) for changing the opening moment of the starting valve during the start-up.