Claims
- 1. An accumulator type fuel injection system having an accumulator adapted to store therein a fuel pressurized by a fuel pump, and a fuel injection valve to which the fuel stored in said accumulator is supplied, the fuel stored in said accumulator being injected from said injection valve into a combustion chamber, said fuel injection system comprising:a first accumulator adapted to store therein a high-pressure fuel pressurized by said fuel pump; a plurality of fuel injection valves connected to said first accumulator via a plurality of fuel passages and having nozzles for injecting the fuel into said combustion chambers of said engine; a plurality of first control valves provided in said fuel passages and adapted to control the discharging of the high-pressure fuel in said first accumulator to a downstream side of said fuel passages; a second accumulator adapted to store therein a fuel the pressure of which is lower than that of the high-pressure fuel in said first accumulator and connected via branch passages to a plurality of portions of said fuel passages which are on a downstream side of said first control valves; a second control valve adapted to control the discharging of the low-pressure fuel in said second accumulator to an atmosphere-opened side; a failure detecting device that detects the occurrence of failure in said accumulator type fuel injection system; a fuel control device adapted to control, during a regular operation of said engine, an operation for opening said first control valves in the midst of a period of time in which said fuel injection nozzles are opened and an operation for closing said first control valves simultaneously with the closure of said fuel injection nozzles, and set, when the occurrence of failure in said accumulator type fuel injection system is detected by said failure detecting device, a pressure of the fuel discharged from said fuel pump so that a fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator; and a fuel pressure detecting device for detecting a fuel pressure in said second accumulator; wherein said fuel control device controls the opening of said second control valve in accordance with an output from said fuel pressure detecting device so as to have the fuel pressure in said second accumulator attain a set level; and wherein said failure detecting device judges that said second control valve gets out of order when a rate of opening thereof with respect to the set pressure is out of a reference region.
- 2. An accumulator type fuel injection system having an accumulator adapted to store therein a fuel pressurized by a fuel pump, and a fuel injection valve to which the fuel stored in said accumulator is supplied, the fuel stored in said accumulator being injected from said injection valve into a combustion chamber, said fuel injection system comprising:a first accumulator adapted to store therein a high-pressure fuel pressurized by said fuel pump; a plurality of fuel injection valves connected to said first accumulator via a plurality of fuel passages and having nozzles for injecting the fuel into said combustion chambers of said engine; a plurality of first control valves provided in said fuel passages and adapted to control the discharging of the high-pressure fuel in said first accumulator to a downstream side of said fuel passages; a second accumulator adapted to store therein a fuel the pressure of which is lower than that of the high-pressure fuel in said first accumulator and connected via branch passages to a plurality of portions of said fuel passages which are on a downstream side of said first control valves; a second control valve adapted to control the discharging of the low-pressure fuel in said second accumulator to an atmosphere-opened side; a failure detecting device that detects the occurrence of failure in said accumulator type fuel injection system; a fuel control device adapted to control, during a regular operation of said engine, an operation for opening said first control valves in the midst of a period of time in which said fuel injection nozzles are opened and an operation for closing said first control valves simultaneously with the closure of said fuel injection nozzles, and set, when the occurrence of failure in said accumulator type fuel injection system is detected by said failure detecting device, a pressure of the fuel discharged from said fuel pump so that a fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator; a first fuel pressure detecting device for detecting the fuel pressure in said first accumulator; and a second fuel pressure detecting device for detecting the fuel pressure in said second accumulator; wherein said failure detecting device judges that said first fuel pressure detecting means gets out of order; and wherein said fuel control device closes said second control valve when the failure of said second fuel pressure detecting device is detected by said failure detecting device, whereby a discharge pressure of said fuel pump is controlled in accordance with an output from said first fuel pressure detecting device so that the fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator.
- 3. An accumulator type fuel injection system having an accumulator adapted to store therein a fuel pressurized by a fuel pump, and a fuel injection valve to which the fuel stored in said accumulator is supplied, the fuel stored in said accumulator being injected from said injection valve into a combustion chamber, said fuel injection system comprising:a first accumulator adapted to store therein a high-pressure fuel pressurized by said fuel pump; a plurality of fuel injection valves connected to said first accumulator via a plurality of fuel passages and having nozzles for injecting the fuel into said combustion chambers of said engine; a plurality of first control valves provided in said fuel passages and adapted to control the discharging of the high-pressure fuel in said first accumulator to a downstream side of said fuel passages; a second accumulator adapted to store therein a fuel the pressure of which is lower than that of the high-pressure fuel in said first accumulator and connected via branch passages to a plurality of portions of said fuel passages which are on a downstream side of said first control valves; a second control valve adapted to control the discharging of the low-pressure fuel in said second accumulator to an atmosphere-opened side; a failure detecting device that detects the occurrence of failure in said accumulator type fuel injection system; a fuel control device adapted to control, during a regular operation of said engine, an operation for opening said first control valves in the midst of a period of time in which said fuel injection nozzles are opened and an operation for closing said first control valves simultaneously with the closure of said fuel injection nozzles, and set, when the occurrence of failure in said accumulator type fuel injection system is detected by said failure detecting device, a pressure of the fuel discharged from said fuel pump so that a fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator; and an orifice located an upstream side of said second accumulator in said branch passages for restricting a fuel flow to said second accumulator; wherein said fuel control device controls a pressure of the fuel discharged from said fuel pump so that a fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator and controls an opening time of first control valves to be set to the time earlier than an opening time of said injector valve, when said failure detecting device judges that said second control valve gets out of order in an opened state.
- 4. An accumulator type fuel injection system having an accumulator adapted to store therein a fuel pressurized by a fuel pump, and a fuel injection valve to which the fuel stored in said accumulator is supplied, the fuel stored in said accumulator being injected from said injection valve into a combustion chamber, said fuel injection system comprising:a first accumulator adapted to store therein a high-pressure fuel pressurized by said fuel pump; a plurality of fuel injection valves connected to said first accumulator via a plurality of fuel passages and having nozzles for injecting the fuel into said combustion chambers of said engine; a plurality of first control valves provided in said fuel passages and adapted to control the discharging of the high-pressure fuel in said first accumulator to a downstream side of said fuel passages; a second accumulator adapted to store therein a fuel the pressure of which is lower than that of the high-pressure fuel in said first accumulator and connected via branch passages to a plurality of portions of said fuel passages which are on a downstream side of said first control valves; a second control valve adapted to control the discharging of the low-pressure fuel in said second accumulator to an atmosphere-opened side; a failure detecting device that detects the occurrence of failure in said accumulator type fuel injection system; a fuel control device adapted to control, during a regular operation of said engine, an operation for opening said first control valves in the midst of a period of time in which said fuel injection nozzles are opened and an operation for closing said first control valves simultaneously with the closure of said fuel injection nozzles, and set, when the occurrence of failure in said accumulator type fuel injection system is detected by said failure detecting device, a pressure of the fuel discharged from said fuel pump so that a fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator; and an orifice located an upstream side of said second accumulator in said branch passages for restricting a fuel flow to said second accumulator; wherein said fuel control device controls a pressure of the fuel discharged from said fuel pump so that a fuel pressure in said fuel passages becomes not higher than a permissible pressure in said second accumulator and controls an opening time of first control valves to be set to the time earlier than an opening time of said injector valve, when said failure detecting device judges that said first control valve gets out of order in an opened state.
Priority Claims (4)
Number |
Date |
Country |
Kind |
10-331359 |
Nov 1998 |
JP |
|
10-335734 |
Nov 1998 |
JP |
|
10-335735 |
Nov 1998 |
JP |
|
10-335736 |
Nov 1998 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATIONS
This is a continuation of application Ser. No. 09/758,944 filed Jan. 11, 2001 now U.S. Pat. No. 6,378,498, which in turn is a continuation of application Ser. No. 09/443,728 filed on Nov. 19, 1999 now abandoned.
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Continuations (2)
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Number |
Date |
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Parent |
09/758944 |
Jan 2001 |
US |
Child |
10/074496 |
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US |
Parent |
09/443728 |
Nov 1999 |
US |
Child |
09/758944 |
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US |