In-Vehicle Linear Motor Compressor Stroke Control
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Solution Overview
Problem
In-vehicle compression devices fail to operate effectively at low engine speeds or when the engine is stopped due to insufficient battery voltage, leading to issues with noise and vibration.
Innovation Solution
An in-vehicle compression device featuring a linear motor and controller that adjusts the piston stroke to operate at low current, noise, and vibration levels, using a compressor with a cylinder and piston, and a controller that varies the stroke based on vehicle state, including engine speed, vehicle speed, and battery voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the electric motor is stopped or driven at low speed to reduce compressor noise, then noise is reduced, but the compressor cannot operate when battery voltage is low
Solution Approach 1:
The patent replaces the traditional crank mechanism with a linear motor to directly drive the piston. This substitution eliminates the need for rotational-to-reciprocating conversion, allowing the compressor to operate reliably at low battery voltages while maintaining low noise levels, as the linear motor can be precisely controlled without the mechanical losses and inefficiencies of crank mechanisms
Solution Approach 2:
The patent changes the control parameter from rotational speed (in traditional systems) to direct linear displacement of the piston. By controlling the linear motor's stroke length and frequency directly, the system can operate at low currents and voltages while maintaining compression function, resolving the contradiction between noise reduction and operational reliability
2Productivity
If the piston stroke is increased to improve compression output, then compression efficiency is improved, but noise and vibration increase
Solution Approach 1:
The patent implements dynamic control of the piston stroke length through the linear motor. The controller can adjust the stroke length in real-time based on vehicle conditions, allowing the system to optimize between compression output and noise/vibration levels. This dynamic adjustment capability enables the compressor to adapt its performance characteristics to different operating conditions
Solution Approach 2:
The patent changes the fixed stroke length parameter into a variable parameter controlled by the linear motor. By varying the stroke length and frequency dynamically, the system can achieve high compression output when needed while maintaining low noise and vibration during normal operation, effectively resolving the contradiction between productivity and harmful factors
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
Enables the compressor to function at low battery voltage with reduced noise and vibration, ensuring reliable operation and quick vehicle height adjustments.
Implementation Method 1
a linear motor including a movable element reciprocatably connected to the piston
Implementation Method 2
a compressor including a cylinder and a piston that is slidably provided inside the cylinder and defines a compression chamber
Data Source
AI summary
An in-vehicle compression device includes: a compressor including a cylinder and a piston that is slidably provided inside the cylinder and defines a compression chamber; a linear motor including a movable element reciprocatably connected to the piston; and a controller configured to control driving of the linear motor. The in-vehicle compression device is configured to supply a working fluid compressed in the compression chamber to a pressure device provided in a vehicle. The controller is configured to variably adjust a stroke of the piston according to a state of the vehicle.