METHOD OF CONTROLLING LOW-PRESSURE FUEL PUMP FOR GDI ENGINE

• US 20130138325A1
• Filed: 07/10/2012
• Published: 05/30/2013
• Est. Priority Date: 11/30/2011
• Status: Active Grant

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group), Kia Motors Corporation (Kia Corp.)
• Inventors: Lee, Bum Ky
• Granted Patent: US 9,109,485 B2
• Time in Patent Office: Days
• US Class Current: 701/103
• CPC Class Codes: F01N 2330/32 characterised by the shape, form or number of corrugations of plates, sheets or foils
• CPC Class Codes: F01N 2330/48 characterised by the number of flow passages, e.g. cell density
• CPC Class Codes: F01N 2330/60 Discontinuous, uneven properties of filter material, e.g. different material thickness along the longitudinal direction; Higher filter capacity upstream than downstream in same housing
• CPC Class Codes: F01N 3/0231 using special exhaust apparatus upstream of the filter for producing nitrogen dioxide, e.g. for continuous filter regeneration systems [CRT]
• CPC Class Codes: F01N 3/025 using fuel burner or by adding fuel to exhaust

Abstract

A method of controlling a low-pressure fuel pump for a GDI engine includes setting predetermined driving conditions that affect a drivability of the GDI engine in situations that are generated in a vehicle in which the GDI engine is mounted, open-loop controlling the low-pressure fuel pump when one or more of the predetermined driving conditions occur, and when none of the predetermined driving conditions occurs, close-loop controlling the low-pressure fuel pump according to a signal from a fuel pressure sensor such that a target fuel pressure provided from an engine controller is pursued.

Claims

1. A method of controlling a low-pressure fuel pump for a gasoline direct injection (GDI) engine comprising:

setting predetermined driving conditions that affect a drivability of the GDI engine in situations that are generated in a vehicle in which the GDI engine is mounted;

open-loop controlling the low-pressure fuel pump when one or more of the predetermined driving conditions occur; and

when none of the predetermined driving conditions occurs, close-loop controlling the low-pressure fuel pump according to a signal from a fuel pressure sensor such that a target fuel pressure provided from an engine controller is pursued.

2. The method of claim 1, wherein the predetermined driving conditions include malfunction of a high-pressure system, engine starting, extreme highlands or extreme high temperatures, excessive situations of high loads, and malfunction of the low-pressure fuel pump.

3. The method of claim 2, further comprising:

open-loop controlling the low-pressure fuel pump according to a method specially set in response to a situation when one or more of the predetermined driving conditions occur.

4. The method of claim 3, further comprising:

when it is determined that the high-pressure system of the predetermined driving conditions is out of order, open-loop controlling the low-pressure fuel pump at a maximum flow rate.

5. The method of claim 3, further comprising:

when it is determined that the engine starting is malfunctioned, open-loop controlling the low-pressure fuel pump at a duty rate of 100% for a predetermined time period.

6. The method of claim 3, further comprising:

when it is determined that a driver is driving the vehicle in the extreme highlands or at extreme high temperatures of the predetermined driving conditions, open-loop controlling the low-pressure fuel pump such that the low-pressure fuel pump is operated at a maximum flow rate.

7. The method of claim 3, further comprising:

when it is determined that the vehicle is in the excessive situations of the predetermined driving conditions due to the high loads, open-loop controlling the low-pressure fuel pump with reference to the target fuel pressure provided from the engine controller and a current fuel consumption.

8. The method of claim 3, further comprising:

when it is determined that the low-pressure fuel pump is malfunctioned, open-loop controlling the low-pressure fuel pump at a maximum flow rate.

9. The method of claim 3, wherein malfunction of the low-pressure fuel pump of the predetermined driving conditions includes the cases that a voltage value of the low-pressure fuel pump is unsuitable, there is no CAN signal from the engine controller, there is no confirmation signal in response to a CAN transmission from a pump controller of a low-pressure system, and fuel pressure deviation of the low-pressure system is equal to or greater than 1 bar.