Electric pump system

Abstract

An electric pump system includes a pump, a motor, and a control circuit. The motor drives the pump. The control circuit controls operation of the motor. The control circuit includes a determination circuit, a generation circuit, and a drive circuit. The determination circuit determines the amount of fluid to be discharged from the pump. The generation circuit generates, based on a maximum rotational speed of the motor, a control profile that is used to control the number of revolutions of the motor. The maximum rotational speed of the motor is set according to the environment in which the pump is used. The control profile is used for the pump to discharge the amount of fluid determined by the determination circuit in the shortest time. The drive circuit drives the motor based on the control profile generated by the generation circuit.

What is claimed is: 
     
         1 . An electric pump system, comprising:
 a pump;   a motor that drives the pump; and   a control circuit that controls operation of the motor, wherein,   the control circuit includes   a determination circuit that determines an amount of fluid to be discharged from the pump,   a generation circuit that generates, based on a maximum rotational speed of the motor which is set according to an environment in which the pump is used, a control profile of a rotational speed of the motor which is used for the pump to discharge the amount of fluid determined by the determination circuit in a shortest time, and   a drive circuit that drives the motor based on the control profile generated by the generation circuit.   
     
     
         2 . The electric pump system according to  claim 1 , wherein,
 the control profile includes   a first time period in which the rotational speed of the motor is increased from an initial rotational speed at the time the motor is driven based on the control profile to the maximum rotational speed at a maximum rate of increase that is set according to the environment in which the pump is used,   a second time period in which the maximum rotational speed is maintained, and   a third time period in which the rotational speed of the motor is decreased from the maximum rotational speed to the initial rotational speed at a maximum rate of decrease that is set according to the environment in which the pump is used.   
     
     
         3 . The electric pump system according to  claim 2 , wherein,
 the generation circuit includes   a rotational speed setting circuit that sets the maximum rotational speed according to the environment in which the pump is used,   a rate-of-increase setting circuit that sets the maximum rate of increase according to the environment in which the pump is used, and   a rate-of-decrease setting circuit that sets the maximum rate of decrease according to the environment in which the pump is used.   
     
     
         4 . The electric pump system according to  claim 1 , wherein,
 a pump unit includes the pump, the motor, the generation circuit, and the drive circuit.   
     
     
         5 . The electric pump system according to  claim 1 , wherein,
 a pump unit includes the pump, the motor, and the drive circuit, and   the determination circuit and the generation circuit are not included in the pump unit and are provided separately from the pump unit.   
     
     
         6 . The electric pump system according to  claim 4 , further comprising:
 an upper electronic control unit that sends a command to the pump unit.   
     
     
         7 . The electric pump system according to  claim 6 , wherein,
 the upper electronic control unit is placed away from the pump unit.