Driving Tool Fuel Injection Timing for Response Speed
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Solution Overview
Problem
Conventional driving tools with fuel and air combustion systems experience poor operation response due to the sequential injection of fuel and air, leading to delayed nail driving after trigger operation.
Innovation Solution
A driving tool design where fuel injection starts when the contact member is turned on, and air injection is completed after the trigger is turned on, optimizing the timing to improve response speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If fuel is injected into the combustion chamber after trigger operation, then the combustion process can be initiated, but the operation response time from trigger operation to nail driving is delayed
Solution Approach 1:
The fuel injection valve is controlled to open before the trigger is pulled, pre-loading fuel into the combustion chamber. This preliminary action ensures that when the trigger is pulled and air is injected, the fuel is already in position for immediate combustion, eliminating the delay in nail driving operation.
2Loss of time
If air is injected to generate mixture after fuel injection, then the combustion mixture can be formed, but the sequential process increases the time delay before nail driving
Solution Approach 1:
Fuel is injected and prepared in the combustion chamber before the trigger operation. When the trigger is pulled, air is immediately injected to form the combustion mixture with the pre-positioned fuel, and ignition occurs promptly, significantly reducing the time delay between trigger operation and nail driving.
Solution Approach 2:
The control unit dynamically adjusts the timing of fuel injection to occur before trigger operation, while air injection is timed to occur immediately upon trigger pull. This dynamic timing coordination optimizes the sequence of events to minimize total process time and maximize driving operation speed.
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 approach significantly shortens the time from trigger operation to nail driving, enhancing the operation response and stability of the driving tool.
Implementation Method 1
after the mixture of the fuel and the air is generated in a combustion chamber, the mixture is ignited and combusted to generate high combustion pressure and drive a piston in a cylinder
Data Source
AI summary
A driving tool includes a main body, a trigger, a contact member and a control unit. The main body has a combustion chamber configured to be filled with fuel and compressed air. The trigger is configured to operate an ignition device to combust a mixture of the fuel and the compressed air filled in the combustion chamber. The contact member is brought into contact with a driving target member to enable an operation of the trigger. The control unit is configured to start an injection of the fuel when the contact member is turned on, and to complete an injection of the air after the trigger is turned on.