Handheld Work Machine Voltage Split for Reliable Engine Start
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Solution Overview
Problem
Handheld work machines face challenges in generating sufficient supply voltage during the start-up phase, leading to impaired starting behavior due to diversion of ignition energy for control functions, resulting in inconsistent ignition and insufficient control voltage for electrical injection.
Innovation Solution
The supply voltage is split into ignition and control voltages, with an additional voltage source providing control voltage during engine start-up, allowing for a smaller and more efficient design, and using rechargeable or standard batteries that can be easily replaced or recharged, and monitored for optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the voltage generator is used to provide both ignition voltage and control voltage during start-up, then the generator can supply all necessary voltages, but the control voltage is insufficient because energy is diverted to ignition functions
Solution Approach 1:
The patent segments the voltage supply function by introducing a second voltage source that is dedicated exclusively to providing control voltage during start-up. This separates the ignition voltage function (handled by the voltage generator) from the control voltage function (handled by the second voltage source), ensuring that ignition energy is not diverted from control functions.
Solution Approach 2:
The patent introduces a second voltage source as an intermediary element that mediates between the voltage generator and the control electronics. This intermediary provides the necessary control voltage during start-up without interfering with the ignition voltage generation, thereby resolving the conflict between ignition energy requirements and control voltage requirements.
2Reliability
If elaborate start circuitry is added to ensure sufficient control voltage during start-up, then control voltage can be maintained, but the device complexity and cost increase significantly
Solution Approach 1:
The patent employs a self-service approach where the second voltage source automatically provides control voltage during start-up without requiring complex control circuitry. The system self-regulates by drawing power from the second voltage source when the engine is not running and automatically switching to the voltage generator when the engine is running, eliminating the need for elaborate start circuitry.
Solution Approach 2:
The patent uses a relatively simple, inexpensive second voltage source (such as a battery or capacitor) that can be easily replaced or recharged, rather than investing in complex, expensive start circuitry. This disposable or rechargeable component provides a cost-effective solution to the starting problem.
3Ease of operation
If part of the ignition energy is diverted for control functions, then control voltage can be supplied, but the ignition energy becomes non-constant and insufficient for reliable ignition
Solution Approach 1:
The patent segments the electrical energy supply by dedicating the voltage generator exclusively to ignition voltage and introducing a second voltage source exclusively for control voltage. This segmentation ensures that ignition energy remains constant and sufficient while control functions receive adequate voltage independently.
Solution Approach 2:
The second voltage source acts as an intermediary that supplies control voltage without interfering with the ignition energy from the voltage generator. This intermediary relationship ensures that control functions are enabled while ignition energy remains undiminished and constant.
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 ensures consistent and optimal starting behavior without the need for expensive start circuitry, allowing for reliable ignition and control of the combustion engine, while enabling the use of commercially available batteries and reducing weight and cost.
Implementation Method 1
a voltage generator (108) which generates a voltage which is independent of the rotary speed of the combustion engine
Implementation Method 2
the additional voltage source comprises at least one rechargeable battery or accumulator. In this way the voltage source or the rechargeable battery can be recharged, i.e. can store energy, time and again
Data Source
AI summary
In order to provide a handheld work machine that does not require expensive start circuitry for the critical start-up phase of the combustion engine, and in which nevertheless the required constant supply voltage for the engine is present in order to achieve optimum starting behavior, a handheld work machine is provided with at least one combustion engine which in operation requires a supply voltage, and with a voltage generator that supplies a generator voltage that depends on the rotary speed of the combustion engine, which generator voltage is used to generate the supply voltage, wherein the handheld work machine is electrically connected to an additional voltage source that prior to starting the combustion engine provides the required supply voltage that at this point in time is not yet present.