Method and system for controlling electrical vacuum pump

Patent metadata

Field	Value
Publication number	US-9712088-B2
Application number	US-201514867146-A
Country	US
Kind code	B2
Filing date	Sep 28, 2015
Priority date	Dec 11, 2014
Publication date	Jul 18, 2017
Grant date	Jul 18, 2017

Abstract

A control method and system of an electrical vacuum pump is provide to resolve generation of peak current when a motor of the electrical vacuum pump initially starts and implement a soft start. The electrical vacuum pump generates vacuum by suctioning air by rotating a pump with a motor. The control method includes starting the motor by supplying a power supply to the motor to switch on the electrical vacuum pump and sensing current applied to the motor using a current sensing circuit. In addition, the method includes determining a target value of motor input voltage set as a value according to the sensed applied current while starting the motor until the sensed applied current reaches a predetermined current and adjusted the motor input voltage applied to the motor to correspond to the target value.

First claim

What is claimed is:

1. A control method of an electrical vacuum pump which generates vacuum by suctioning air by rotating a pump with a motor, the method comprising:
starting, by a controller, the motor by supplying a power supply to the motor to switch on the electrical vacuum pump;
sensing, by the controller, current applied to the motor using a current sensing circuit; and
determining, by the controller, a target value of motor input voltage set as a value based on the sensed applied current while starting the motor until the sensed applied current reaches a predetermined current and adjusting the motor input voltage applied to the motor to correspond to the target value,
wherein in a reference table, a target value of input voltage that corresponds to the applied current is set for each time period at a predetermined time interval, and the motor input voltage is adjusted to correspond to the target value calculated from the reference table based on the sensed applied current at a predetermined time interval by time-dividing a time while starting the motor.

2. The method of claim 1 , wherein in the reference table, a target value of the input voltage is set to be increased as the applied current is increased.

3. The method of claim 1 , wherein an IG 1 terminal of the electrical vacuum pump is connected to directly receive an IG 1 power supply of the vehicle and the IG 1 power supply applied via the IG 1 terminal is used as an operation source of the electrical vacuum pump including a signal that represented an IG 1 state of the vehicle power supply and the motor.

4. The method of claim 3 , wherein the starting of the motor includes:
recognizing, by the controller, an IG 1 switch on state of the vehicle power supply from the IG 1 power supply applied via the IG 1 terminal when the vehicle power supply is in an IG 1 switch on state by a starting operation of a driver;
receiving, by the controller, an engine switch on signal from an engine control unit via a controller area network (CAN) communication terminal of the electrical vacuum pump; and
starting, by the controller, a motor start by the vehicle power supply supplied via the IG 1 terminal in response to determining vacuum pressure of the brake booster which is greater than a predetermined level based on a signal of a vacuum sensor or a vacuum switch.

5. A control system of an electrical vacuum pump which generates vacuum by suctioning air by rotating a pump with a motor, the system comprising:
a memory configured to store program instructions; and
a processor configured to execute the program instructions, the program instructions when executed configured to:
start the motor by supplying a power supply to the motor to switch on the electrical vacuum pump;
sense current applied to the motor using a current sensing circuit; and
determine a target value of motor input voltage set as a value based on the sensed applied current while starting the motor until the sensed applied current reaches a predetermined current and adjusting the motor input voltage applied to the motor to correspond to the target value,

wherein in a reference table, a target value of input voltage that corresponds to the applied current is set for each time period at a predetermined time interval, and the motor input voltage is adjusted to correspond to the target value calculated from the reference table based on the sensed applied current at a predetermined time interval by time-dividing a time while starting the motor.

6. The system of claim 5 , wherein in the reference table, a target value of the input voltage is set to be increased as the applied current is increased.

7. The system of claim 5 , wherein an IG 1 terminal of the electrical vacuum pump is connected to directly receive an IG 1 power supply of the vehicle and the IG 1 power supply applied via the IG 1 terminal is used as an operation source of the electrical vacuum pump including a signal that represented an IG 1 state of the vehicle power supply and the motor.

8. The system of claim 7 , wherein the program instructions when executed for the starting of the motor are further configured to:
recognize an IG 1 switch on state of the vehicle power supply from the IG 1 power supply applied via the IG 1 terminal when the vehicle power supply is in an IG 1 switch on state by a starting operation of a driver;
receive an engine switch on signal from an engine control unit via a controller area network (CAN) communication terminal of the electrical vacuum pump; and
start a motor start by the vehicle power supply supplied via the IG 1 terminal in response to determining vacuum pressure of the brake booster which is greater than a predetermined level based on a signal of a vacuum sensor or a vacuum switch.

Assignees

• Hyundai Motor Co Ltd

Inventors

• Kang Min Jae
• Lee Sung Woo
• Choi Hoon

Classifications

• H02P1/18

  for starting an individual DC motor · CPC title

• H02P1/04 Primary

  Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter · CPC title

• F04C14/06

  specially adapted for stopping, starting, idling or no-load operation · CPC title

• F04B49/02

  Stopping, starting, unloading or idling control · CPC title

• B60T17/02 Primary

  Arrangements of pumps or compressors, or control devices therefor · CPC title