Air compressor control system
First Claim
1. An air compressor control system comprising a motor, an accumulation tank, a pump driven by said motor to pump forced air into said accumulation tank, a pressure switch connected to said accumulation tank, a pressure switch connected to said accumulation tank and adapted for detecting the air pressure of said accumulation tank, and a pressure control valve connected between said accumulation tank and said pump and adapted for relieving forced air from said pump, wherein a micro-controller is connected between said motor and an AC power supply and adapted for receiving a signal from said pressure switch and controlling operation of said pressure control valve and said motor subject to the position of said pressure switch, said micro-controller comprising a CPU, a chopping circuit, a current phase detection circuit, and a voltage phase detection circuit, said CPU detdermining a phase difference between a current phase detected by said current phase detection circuit and a voltage phase detected by said voltage phase detection circuit for determining the degree of the load acted at said pump, said CPU controlling said chopper circuit to chop AC power supply subject to the degree of the load for enabling a program set therein to determine a triggering angle in an inversely proportional manner with respect to the load;
- at an initial stage of the supply of power supply to the air compressor, said micro-controller controlling said air pressure control valve to relieve air pressure, preventing said pump from pumping forced air into said accumulation tank, and then closing said air pressure control valve to stop relieving air pressure after said motor has been fully started, for enabling said pump to pump forced air into said accumulation tank;
when the air pressure of said accumulation tank reaches a predetermined high level, said pressure switch being switched to an “
off”
position, providing an “
off”
signal to said micro-controller, thereby causing said micro-controller to open said air pressure control valve, preventing said pump from pumping forced air into said accumulation tank, and then stopping said motor;
said pressure switch being switched to an “
on”
position during normal functioning of the air compressor to pump forced air into said accumulation tank, and feeding back an “
on”
signal to said micro-controller;
when the air pressure of said accumulation tank reaches the predetermined high level, said pressure switch being switched from the “
on”
position to the “
off”
position, providing the “
off”
signal to said micro-controller, thereby causing said micro-controller to open said air pressure control valve for relieving air pressure and then cutting off power supply from said motor;
when the air pressure of said accumulation tank drops below the predetermined low level, said pressure switch being switched to the “
on”
position, thereby causing said micro-controller to provide power supply to said motor again;
said air pressure control valve being maintained opened to relieve forced air from said pump at the initial stage when starting said motor, and said air pressure control valve being closed for enabling forced air to be pumped into said accumulation tank by said pump after said motor has been fully started.
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Accused Products
Abstract
An air compressor control system is constructed to include a motor, an accumulation tank, a pump, a pressure switch, a pressure control valve, and a micro-controller. When the pressure of the accumulation tank surpassed a predetermined high level, the pressure switch is off, thereby causing the micro-controller to open the pressure control valve for relieving forced air pressure and then to turn off the motor. When the pressure of the accumulation tank dropped below the predetermined low level, the pressure switch is switched on, thereby causing the micro-controller to provide power supply to the motor again and then to close the air pressure control valve for enabling forced air to be pumped into the accumulation tank by the pump after the motor has been fully started.
73 Citations
1 Claim
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1. An air compressor control system comprising a motor, an accumulation tank, a pump driven by said motor to pump forced air into said accumulation tank, a pressure switch connected to said accumulation tank, a pressure switch connected to said accumulation tank and adapted for detecting the air pressure of said accumulation tank, and a pressure control valve connected between said accumulation tank and said pump and adapted for relieving forced air from said pump, wherein a micro-controller is connected between said motor and an AC power supply and adapted for receiving a signal from said pressure switch and controlling operation of said pressure control valve and said motor subject to the position of said pressure switch, said micro-controller comprising a CPU, a chopping circuit, a current phase detection circuit, and a voltage phase detection circuit, said CPU detdermining a phase difference between a current phase detected by said current phase detection circuit and a voltage phase detected by said voltage phase detection circuit for determining the degree of the load acted at said pump, said CPU controlling said chopper circuit to chop AC power supply subject to the degree of the load for enabling a program set therein to determine a triggering angle in an inversely proportional manner with respect to the load;
- at an initial stage of the supply of power supply to the air compressor, said micro-controller controlling said air pressure control valve to relieve air pressure, preventing said pump from pumping forced air into said accumulation tank, and then closing said air pressure control valve to stop relieving air pressure after said motor has been fully started, for enabling said pump to pump forced air into said accumulation tank;
when the air pressure of said accumulation tank reaches a predetermined high level, said pressure switch being switched to an “
off”
position, providing an “
off”
signal to said micro-controller, thereby causing said micro-controller to open said air pressure control valve, preventing said pump from pumping forced air into said accumulation tank, and then stopping said motor;
said pressure switch being switched to an “
on”
position during normal functioning of the air compressor to pump forced air into said accumulation tank, and feeding back an “
on”
signal to said micro-controller;
when the air pressure of said accumulation tank reaches the predetermined high level, said pressure switch being switched from the “
on”
position to the “
off”
position, providing the “
off”
signal to said micro-controller, thereby causing said micro-controller to open said air pressure control valve for relieving air pressure and then cutting off power supply from said motor;
when the air pressure of said accumulation tank drops below the predetermined low level, said pressure switch being switched to the “
on”
position, thereby causing said micro-controller to provide power supply to said motor again;
said air pressure control valve being maintained opened to relieve forced air from said pump at the initial stage when starting said motor, and said air pressure control valve being closed for enabling forced air to be pumped into said accumulation tank by said pump after said motor has been fully started.
- at an initial stage of the supply of power supply to the air compressor, said micro-controller controlling said air pressure control valve to relieve air pressure, preventing said pump from pumping forced air into said accumulation tank, and then closing said air pressure control valve to stop relieving air pressure after said motor has been fully started, for enabling said pump to pump forced air into said accumulation tank;
Specification
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- Resources
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Current AssigneeKuei-Hsien Shen
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Original AssigneeKuei-Hsien Shen
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InventorsShen, Kuei-Hsien
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Primary Examiner(s)Freay, Charles G.
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Assistant Examiner(s)Rodriguez, William H.
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Application NumberUS09/993,475Publication NumberTime in Patent Office602 DaysField of Search417/44.2, 417/44.1, 417/26, 417/307, 417/271, 417/23, 417/44.11, 137/115.25US Class Current417/44.2CPC Class CodesF04B 49/08 Regulating by delivery pres...F04B 49/24 BypassingY10T 137/264 Electrical control
