Brushed DC Compressor Motor Control Circuit
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Solution Overview
Problem
Compressor systems for generating compressed air in vehicles face limitations in dynamic control and energy dissipation, particularly with brushed direct current electric motors, which can lead to increased power consumption and reduced reliability during start-up and load changes.
Innovation Solution
A compressor system with a brushed direct current electric motor and a control unit that includes a free-running current path and a switch controller to dynamically control the switched-on and switched-off time periods, allowing for variable PWM control to optimize energy dissipation and maintain compressor dynamics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a brushed direct current electric motor is used to drive the compressor, then reliability and load tolerance are improved, but energy consumption increases during switching-on and switching-off procedures
Solution Approach 1:
The patent applies dynamics by making the electrical circuit configuration changeable during operation. The circuit can switch between series connection (during start-up) and parallel connection (during normal operation), allowing the system to adapt its electrical characteristics dynamically to different operating conditions, thereby reducing energy consumption while maintaining reliability
Solution Approach 2:
The patent changes electrical parameters (connection configuration) to optimize performance. By changing from series to parallel connection, the electrical resistance and current distribution are modified, which reduces power consumption during switching operations while maintaining the motor's reliable start-up capability
2Ease of operation
If a compressor relay with semiconductor switch is used for control, then switching control is improved, but energy dissipation in the control circuit increases
Solution Approach 1:
The patent makes the circuit configuration dynamic by allowing switching between series and parallel connections. This dynamic reconfiguration reduces the time duration of high-energy dissipation states during switching operations, thereby reducing overall energy loss while maintaining effective switching control
Solution Approach 2:
The patent employs periodic switching between different circuit configurations during start-up and operation cycles. This periodic action allows the system to spend less time in high-energy-dissipation states, reducing overall energy loss while maintaining effective control
3Speed
If PWM control is applied to the electric motor, then rotational speed control is improved, but complexity of the control circuit increases
Solution Approach 1:
The patent merges the PWM control functionality with the existing compressor relay and semiconductor switch circuit. By integrating these control functions into the existing hardware framework rather than adding separate control systems, the patent achieves rotational speed control while minimizing additional circuit complexity
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 enhances the operational efficiency of the compressor by reducing energy dissipation in the control circuit, maintaining compressor dynamics, and preventing overloading of components, thereby improving reliability and cost-effectiveness.
Implementation Method 1
A free-running current path is allocated to the control unit, the free-running current path being configured so as to delimit the operating current of the electric motor in a variable manner
Implementation Method 2
the switch controller being configured so as to specify a switched-on time period (tON) and/or a switched-off time period (tOFF) for the electric motor in a variable manner
Data Source
AI summary
A compressor system for generating compressed air for a compressed air supply system in a vehicle. The compressor system includes a brushed direct current electric motor (BDC electric motor); a compressor configured to be driven by the BDC electric motor; and a control unit for controlling the BDC electric motor and allocated to the BDC electric motor so as to delimit an operating current of the electric motor. A free-running current path is allocated to the control unit, the free-running current path being configured to delimit the operating current of the electric motor in a variable manner. A switch controller is allocated to the control unit, the switch controller being configured to specify a switched-on time period (t_ON) and/or a switched-off time period (t_OFF) for the electric motor in a variable manner.