Push Working Machine With Staged Acceleration for Smooth Startup
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Solution Overview
Problem
Existing garden tools, such as push mowers and snow throwers, lack the ability to vary starting acceleration, leading to either rapid but rough startup or slow and unsatisfactory initiation.
Innovation Solution
A push working machine equipped with a controller that can adjust the acceleration of the traveling and functional motors, allowing for variable starting accelerations, including multiple stages of acceleration changes based on time, speed thresholds, or user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the traveling motor accelerates rapidly to reach target speed quickly, then the startup response time is improved, but the operational smoothness deteriorates causing rough startup
Solution Approach 1:
The startup process is segmented into multiple acceleration stages with different acceleration rates. The controller divides the acceleration from stationary to target speed into at least two distinct phases, allowing rapid initial acceleration followed by a smoother transition phase, thus resolving the contradiction between quick response and operational smoothness.
Solution Approach 2:
The acceleration rate is made dynamic rather than constant. The controller adjusts the acceleration rate based on the current speed and stage of startup, transitioning from a higher acceleration rate at lower speeds to a lower acceleration rate as the target speed is approached, thereby achieving both rapid startup and smooth operation.
2Ease of operation
If the traveling motor accelerates slowly to maintain smooth operation, then the operational smoothness is improved, but the startup response time increases
Solution Approach 1:
The startup process is divided into multiple acceleration stages, allowing the system to use higher acceleration in early stages when smoothness is less critical, and transition to lower acceleration in later stages when approaching target speed, thus reducing overall startup time while maintaining smoothness where needed.
Solution Approach 2:
The controller implements periodic adjustment of acceleration rates during the startup sequence, alternating between higher acceleration periods for rapid speed gain and lower acceleration periods for smooth transitions, creating a rhythm that optimizes both response time and operational smoothness.
Data Source
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AI summary
A push working machine (100) includes a body (12) including at least a traveling assembly (121), a traveling motor (23) driving the traveling assembly, a functional assembly, and a functional motor (25) driving the functional assembly; a handle device (11) connected to the body and including at least an operating member (112) for a user to operate; a controller (21) configured to control at least the working states of the traveling motor and the functional motor; and a power interface (20) for connecting electrical energy capable of supplying power to at least the traveling motor and the functional motor. The controller (21) is configured to, in response to a start signal, be capable of controlling the traveling motor (23) to accelerate to the first speed (v1) with the first acceleration (a1) and accelerate to the target self-propelled speed (v2) with the second acceleration (a2).