Electric pump system

An electric pump system for supplying working fluid to a driving target object, the electric pump system comprising:

• a pump configured such that a discharge flow rate is controlled in accordance with an opening degree of a solenoid valve, operation of the solenoid valve being controlled by energization;
• an electric motor configured to drive the pump;
• a control device configured to control the operation of the solenoid valve of the pump and operation of the electric motor based on a command signal indicating a required discharge flow rate or a required discharge pressure of the pump;
• and
• a rotation detection unit configured to detect a rotation rate of the electric motor, wherein
• the control device is configured to adjust the operation of at least one of the solenoid valve and the electric motor when a determination condition is satisfied, the determination condition being set based on vibration generated in the electric pump system or the driving target object,
• the pump is a vane pump, and
• the control device is further configured to
• calculate a frequency of an order component of the pump based on a number of vanes of the pump and a detection result from the rotation detection unit;
• calculate a frequency of an order component of the electric motor based on any of a number of slots, a number of poles, and a least common multiple of the number of slots and the number of poles of the electric motor, and on the detection result from the rotation detection unit;
• and
• adjust the operations of at least one of the solenoid valve and the electric motor by determining that the determination condition is satisfied when the frequency of the order component of the pump and the frequency of the order component of the electric motor are overlapped.

An electric pump system for supplying working fluid to a driving target object, the electric pump system comprising:

• a pump configured such that a discharge flow rate is controlled in accordance with an opening degree of a solenoid valve, operation of the solenoid valve being controlled by energization;
• an electric motor configured to drive the pump;
• and
• a control device configured to control the operation of the solenoid valve of the pump and operation of the electric motor based on a command signal indicating a required discharge flow rate or a required discharge pressure of the pump, wherein
• the control device is configured to adjust the operation of at least one of the solenoid valve and the electric motor when a determination condition is satisfied, the determination condition being set based on vibration generated in the electric pump system or the driving target object,
• a control map indicating a usage limited condition under which vibration equal to or greater than a predetermined level is generated for a combination of the rotation rate of the electric motor and the opening degree of the solenoid valve is stored in the control device, and
• the control device is further configured to adjust the operations of at least one of the solenoid valve and the electric motor by determining that the determination condition is satisfied when the solenoid valve and the electric motor are operated under the usage limited condition.