GB2303470A - Disabling fuel injection actuators during glow plug heating - Google Patents

Disabling fuel injection actuators during glow plug heating Download PDF

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Publication number
GB2303470A
GB2303470A GB9614750A GB9614750A GB2303470A GB 2303470 A GB2303470 A GB 2303470A GB 9614750 A GB9614750 A GB 9614750A GB 9614750 A GB9614750 A GB 9614750A GB 2303470 A GB2303470 A GB 2303470A
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United Kingdom
Prior art keywords
injection
control
glow plug
injection timing
diesel engine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
GB9614750A
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GB9614750D0 (en
GB2303470B (en
Inventor
Osamu Mori
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Bosch Corp
Original Assignee
Zexel Corp
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Filing date
Publication date
Application filed by Zexel Corp filed Critical Zexel Corp
Publication of GB9614750D0 publication Critical patent/GB9614750D0/en
Publication of GB2303470A publication Critical patent/GB2303470A/en
Application granted granted Critical
Publication of GB2303470B publication Critical patent/GB2303470B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/06—Introducing corrections for particular operating conditions for engine starting or warming up
    • F02D41/062—Introducing corrections for particular operating conditions for engine starting or warming up for starting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02P—IGNITION, OTHER THAN COMPRESSION IGNITION, FOR INTERNAL-COMBUSTION ENGINES; TESTING OF IGNITION TIMING IN COMPRESSION-IGNITION ENGINES
    • F02P19/00—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition
    • F02P19/02—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs
    • F02P19/021—Incandescent ignition, e.g. during starting of internal combustion engines; Combination of incandescent and spark ignition electric, e.g. layout of circuits of apparatus having glowing plugs characterised by power delivery controls

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Description

2303470 FUEL INJECTION CONTROL APPARATUS FOR DIESEL ENGINE This invention
relates to a fuel injection control apparatus for a preheating chamber diesel engine.
In an electrical fuel injection control apparatus for a preheating chamber diesel engine, engine control means activates electromagnetic drive actuators of an injection pump to control the amount and timing of fuel injection while a glow plug heats quickly the inside of the cylinders of a diesel engine at a temperature required for the combustion of fuel prior to the start of the diesel engine by supplying power to the glow plug and the engine control means from a car battery in response to a power-on signal of a key switch.
An actuator for controlling the amount of fuel injection in an injection pump involves such a problem as response delay; i.e., it takes time to stabilize operational characteristics thereof in response to output from the engine control means.
In contrast to this, an actuator for controlling the timing of fuel injection in the injection pump is free from response delay; i.e., it does not take time to stabilize operational characteristics thereof in response to output from the engine control means.
JP-A-4-47128 (the term "JP-A" as used herein means an "unexamined published Japanese patent application") _iscloses a injection timing control apparatus for a diesel engine in which the operation of an electromagnetic injection timing control actuator for adjusting the pressure of a timer piston cham r in the injection pump, like an electromagnetic valve, is inhibited by stopping the control of fuel injection timing during the period from the power-on switching of a key switch to the start of the engine with a starter switch so as to reduce operation noise generated by the injection timing control actuator.
in the above fuel injection control apparatus of the prior art, although the amount of power consumption is large because the temperature is raised quickly during the ignition of the glow plug, power is supplied to the actuators for controlling the amount and timing of fuel injection by the injection pump as well. Thus, a load on the car battery is great during the period from power-on switching to the start of the engine.
It is therefore an object of the present invention to provide a fuel injection control apparatus for a diesel engine which can reduce the load on the car battery during the ignition of the glow plug within a range that does not affect the start operation of the engine that follows the ignition of the glow plug.
The present invention is a fuel injection control apparatus for a diesel engine in which engine control means controls the amount and timing of fuel injection by an injection pump while a glow plug heats the inside of the cylinders of a diesel engine to a temperature required for the combustion of fuel prior to the start of the diesel engine by supplying power to the glow plug and the engine control means from a car battery in response to a power-on signal from a key switch, wherein the fuel injection control apparatus comprises energization stop means which computes an energization stop time corresponding to the energization time of the glow plug in response to a power-on signal from the key switch, stops applying electricity to the injection control actuators of the injection pump from the car battery for the computed energization stop time, and starts applying electricity to the injection control actuators from the car battery after the end of the energization stop time.
According to the present invention the load on the car battery can be reduced during the ignition of the glow plug by stopping applying electricity to the injection control actuators from the car battery for the energization stop time corresponding to the energization time of the glow plug due to the power-on switching of the key switch. Further, the start of the diesel engine can be performed properly after the ignition of the glow plug by starting applying electricity to the injection control actuators from the car battery after the end of the energization stop time.
Therefore, the load on the car battery can be reduced without affecting the start of the diesel engine and a quality feeling and reliability can be improved.
The fuel injection control apparatus may further 5 comprise priority energisation means in addition to the energisation stop means. The priority energisation means starts applying electricity to the injection control actuators from the car battery prior to the stop of energisation by the energisation stop means when it receives an engine start signal from the starter switch within the energisation stop time.
Thus, the application of electricity to the injection control actuators from the car battery is forcedly started with an engine start signal from the start switch within the energisation stop time, whereby the diesel engine can be started properly and be smoothly performed by operation of the starter switch by a passenger without waiting for the end of the energisation stop time.
The injection control actuators may be actuators which are free from the delay of response to a power-on signal from the key switch.
Thus, the start of the diesel engine can be performed properly.
The energisation time of the glow plug may be determined based on the temperature of water for cooling the engine.
Thus, the control of stopping injection timing control is optimized by determining the energisation time of the glow plug based on the temperature of water for cooling the engine.
A map prepared based on the temperature of water for cooling the engine may be used to calculate the energisation stop time.
This allows the control of stopping injection timing control to be optimised.
Where the actuator free from response delay is used, it may be an injection timing control actuator.
Thus,the start of the diesel engine in performed in accordance with an appropriate amount of injection and appropriate injection timing and hence, in further optimised by forming the injection timing control actuator as an actuator free from response delay.
The invention will be further described by way of non-limitative example, with reference to the accompanying drawings, in which:- Figure 1 in a structural diagram showing an embodiment of the present invention 1 Fig. 2 is a f low chart showing the control of stopping injection timing control according to the embodiment of the present invention; and Fig. 3 is a timing chart showing the control of stopping injection timing control according to the embodiment of the present invention.
A preferred embodiment of the present invention is described in detail with reference to the accompanying drawings.
Fig. I shows a fuel injection control apparatus for a diesel engine according to an embodiment of the present invention. In Fig. 1, reference numeral 1 is a car battery loaded on a vehicle as a power source, 2 a key switch, 3 a water temperature sensor for detecting the temperature of cooling water and outputting an electric signal converted from the detected temperature, 4 a starter switch, and 5 a control unit formed of a microcomputer for carrying out controls required for fuel injection according to a preset program as engine control means. This control unit comprises energization stop means 6, an energization stop time map 7, a priority energization means 8, injection a unt control means 9 and injection timing control means 10.
The energization stop means 6 calculates an energization stop time T corresponding to the energization time of an unshown glow plug of the diesel engine 15 from the energization stop time map 7 based on water temperature obtained from the water temperature sensor 3 when it receives a power-on signal from the key switch 2, outputs a signal for stopping injection timing control to the injection timing control means 10 within the energization stop time T, and outputs a signal for starting injection timing control to the injection timing control means 10 after the end of the energization stop time.
The energization stop time map 7, as shown on the right of step 205 of Fig. 2, shows water temperature TW on the axis of abscissa and energization stop time T on the axis of ordinate and has a characteristic line L which indicates energization stop time T with respect to water temperature TW on the plane of a first quadrant defined by the axis of abscissa and the axis of ordinate. This characteristic line L is drawn by repeating experiments for the measurement of time elapsed until the temperature inside the cylinders of the diesel engine 15 reaches a temperature required for the combustion of an air-fuel mixture, for example, 6000C, from the start of the glow plug at a certain water temperature and plotting the measurement time of the experiments and water temperature on the plane of the first quadrant.
Returning to Fig. 1, the priority energization means 8 outputs to the injection timing control means 10 a signal for starting injection timing control prior to the stop of the injection timing control by the energization stop means 6 when it receives an engine start signal from the starter switch 4 within the energization stop time T calculated by the energization stop means 6.
The injection amount control means 9 computes the optimal amount of fuel injection at each time in accordance with a preset injection amount program based on detection signals from various sensors such as an accelerator opening sensor for detecting the opening of an unshown accelerator and outputting an electric signal converted from the detected opening, an intake air pressure sensor for detecting the pressure of air sucked into the diesel engine 15 and outputting an electric signal converted from the detected pressure, an intake air temperature sensor for detecting the temperature of air sucked into the diesel engine 15 and outputting an electric signal converted from the detected temperature, and a speed sensor for detecting the speed of the diesel engine 15 and outputting an electric signal converted from the detected speed, and outputs power corresponding to the amount of fuel injection to the electromagnetic drive injection amount control actuator 12 of the injection pump 11 so as to control the amount of fuel injected into the cylinders of the diesel engine 15 from the injection pump 11.
The injection timing control means 10 computes the optimal injection timing at each time in accordance with a preset fuel injection timing program based on detection signals from the above various sensors and outputs power corresponding to the injection timing to the electromagnetic drive injection timing control actuator 13 of the injection pump 11 so as to control the injection timing of fuel injected into the cylinders of the diesel engine 15 from the injection pump 11.
The injection pump 11 injects fuel, which is absorbed and pressurized from the fuel tank 14 mounted on a vehicle, into the corresponding cylinders of the diesel engine 15 in accordance with the fuel injection amount and timing computed by the injection amount control actuator 12 and the injection timing control actuator 13, respectively.
A description is subsequently given of the operation of this embodiment. when a passenger inserts an unshown key plate into the key switch 2 and turns the key plate to a power-on position, the control unit 5 is activated by power supplied from the car battery 1 to carry out the processing of the flow chart of Fig. 2.
That is, when a power-on signal produced by the turning operation of the key switch 2 to the power-on position in step 201 is applied to the control unit 5, the energization stop means 6 outputs a stop signal to the injection timing control means 10 in step 202 to forcedly stop the injection timing control of the injection timing control means 10.
Due to the start of the control of stopping the injection timing control, the injection timing control means 10 stops applying electricity to the injection timing control actuator 13 (since this injection timing control actuator 13 is generally called timer control valve, it is represented by TCV in step 202 of Fig. 2) from the car battery 1 to inhibit the operation of advancing fuel injection timing by the injection pump 11 in the stop state of the diesel engine 15. Then the routine proceeds to step 203.
In step 203, the glow relay is turned on for a preset time and in step 204, power is supplied from the car battery 1 to the glow plug simultaneously with the start of the glow relay. Then the routine proceeds to step 205.
In step 205, the water temperature detected by the water temperature sensor 3 is collated with water temperature TW plotted on the axis of abscissa of the energization stop time map 7, and an energization stop time T corresponding to the collated water temperature TW is calculated as an injection timing control stop time T_Time and temporarily stored. Then the routine proceeds to step 206.
In step 206, it is judged whether or not the starter switch 4 is turned on. When the starter switch 4 remains off as an unshown key plate inserted into the key switch 2 by a passenger is not turned to an engine start position, the routine proceeds to step 207.
In step 207, it is judged whether or not an elapsed time from the arrival of a power-on signal reaches the injection timing control stop time T_Time. When the elapsed time is less than the injection timing control stop time T_Time, the routine returns to step 206, and when the elapsed time reaches the injection timing control stop ti T_Time, the routine proceeds to step 208.
Since the passenger turns the unshown key plate inserted into the key switch 2 to the engine start position before the elapsed time reaches the injection timing control stop time T_Time, the starter switch 4 outputs an engine start signal to the control unit 5. When it is judged that the starter switch 4 is turned on in step 206, the routine skips step 207 and proceeds to step 208.
In step 208, the energization stop means 6 or the priority energization mans 8 outputs a start signal to the injection timing control means 10 so as to cause the injection timing control means 10 to start injection tinLing control.
Due to the start of the injection timing control, the injection timing control means 10 starts applying electricity to the injection timing control actuator 13 from the car battery 1.
In short, according to this embodiment, as shown in the timing chart of Fig. 3, when the passenger turns on the key switch 2 in (A), the control of stopping injection timing control in (B), the glow plug in (C) and the f low relay in (D) are turned on, the temperature of the glow plug in (E) rises quickly, and the cylinders of the diesel engine 15 is quickly heated.
When a time elapsed from the power-on switching of the key switch 2 reaches the injection timing control stop time T_Time calculated from the energization stop time map 7, the glow plug in (C) and the control of stopping injection timing control in (B) are turned off. At this point, the temperature of the glow plug is 6000C.
After the glow plug is turned off due to quick heating, it is duty controlled by unshown glow plug control means of the control unit 5. As a result, the temperature of the glow plug gradually rises to a temperature of 8000C which is sufficient for the combustion of an air-fuel mixture, and that temperature is maintained within a range defined by an upper limit and a lower limit.
Thereafter, when the starter switch 4 is turned on by the operation of the passenger as shown in (F), an unshown starter motor of the diesel engine 15 turns to start the diesel engine 15 as shown in (G).
Due to a rise of a signal from OFF to ON caused by the starter switch 4, the injection timing control means 10 activates the injection timing control actuator 13, the injection pump 11 injects fuel into the corresponding cylinders of the diesel engine 15 sequentially in accordance with injection timing controlled by the operation of the injection timing control actuator 13 and an injection amount controlled by the electromagnetic drive injection amount control actuator 12 which is driven by the rise of the signal from OFF to ON caused by the key switch 2, and the diesel engine 15 keeps turning while repeating explosion, compression, discharge and absorption steps.
The starter switch 4 of (F) is kept on only during the period when the passenger turns the key plate in the key switch from a power-on position to an engine start position, and turned off when the position of the key plate returns from the engine start position to the power-on position.
In this embodiment, during the ignition of the glow plug, the load on the car battery 1 is reduced only by stopping power supply from the car battery 1 to the injection timing control actuator 13. When a stop signal and a start signal from the energization stop means 6 are applied in the control of electric parts in addition to the control of the engine and power supply from the car battery 1 to the electric parts in forcedly stopped'during the ignition of the glow plug, the load on the car battery 1 can be further reduced.
C L A 1 M S 1. A fuel injection control apparatus for a diesel engine in which engine control means controls the amount and timing of fuel injection by an injection pump while a glow plug heats the cylinders of the diesel engine to a temperature required for the combustion of fuel prior to the start of the diesel engine by supplying power to the glow plug and the engine control means from a car battery in response to a power-on signal from a key switch, wherein the fuel injection control apparatus comprises:
energisation stop =cans which computes an energisation stop time corresponding to the energisation time of the glow plug in response to a power-on signal from the key switch, stops applying electricity to injection control actuators of the injection pump from the car battery for this energisation stop time, and starts applying electricity to the injection control actuators from the car battery after the end of the energisation stop time.
2. A fuel injection control apparatus according to claim 1, further comprising priority energisation means which starts applying electricity to the injection control actuators from the car battery prior to the stop of ener- gisation by the energisation stop means when it receives an engine start signal from the starter switch within the energisation stop time.
3. A fuel injection control apparatus for a diesel engine according to claim 1 or 2, wherein the injection control actuators are each an actuator which is - is - free from the delay of response to the power-on signal of the key switch.
4. A fuel injection control apparatus for a diesel engine according to claim 3, wherein the actuator free from response delay is an injection timing control actuator.
5. A fuel injection control apparatus for a diesel engine according to claim 1, 2, 3 or 4, wherein the energisation time of the glow plug is determined based on the temperature of water for cooling the engine.
6. A fuel injection control apparatus for a diesel engine according to claim 1, 2, 3, 4 or 5, wherein a map prepared based on the temperature of water for cooling the engine is used to calculate the energisation 15 stop time.
7. A fuel injection control apparatus for a diesel engine, the apparatus being constructed and arranged to operate substantially as hereinbefore described with reference to and as illustrated in the 20 accompanying drawings.
8. A diesel engine including fuel injection control apparatus according to any one of the preceding claims.
GB9614750A 1995-07-17 1996-07-12 Fuel injection control apparatus for diesel engine Expired - Fee Related GB2303470B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP18010395A JPH0932606A (en) 1995-07-17 1995-07-17 Fuel injection controller for diesel engine

Publications (3)

Publication Number Publication Date
GB9614750D0 GB9614750D0 (en) 1996-09-04
GB2303470A true GB2303470A (en) 1997-02-19
GB2303470B GB2303470B (en) 1999-01-06

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB9614750A Expired - Fee Related GB2303470B (en) 1995-07-17 1996-07-12 Fuel injection control apparatus for diesel engine

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JP (1) JPH0932606A (en)
KR (1) KR0173091B1 (en)
DE (1) DE19628683A1 (en)
GB (1) GB2303470B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7500457B2 (en) 2006-04-13 2009-03-10 Denso Corporation Energization control apparatus and method for glow plug during the period from preglow to afterglow steps

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006025834B4 (en) * 2006-06-02 2010-05-12 Beru Ag Method for controlling a glow plug in a diesel engine
JP5130069B2 (en) * 2008-02-01 2013-01-30 本田技研工業株式会社 Fuel pump control device for internal combustion engine
JP2011017271A (en) * 2009-07-08 2011-01-27 Yanmar Co Ltd Engine control device for working vehicle
JP2011017272A (en) * 2009-07-08 2011-01-27 Yanmar Co Ltd Engine control device for working vehicle

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0420379A2 (en) * 1989-09-29 1991-04-03 Isuzu Motors Limited Engine preheating system
US5413072A (en) * 1991-08-15 1995-05-09 Nartron Corporation Vehicle starter and electrical system protection

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0420379A2 (en) * 1989-09-29 1991-04-03 Isuzu Motors Limited Engine preheating system
US5413072A (en) * 1991-08-15 1995-05-09 Nartron Corporation Vehicle starter and electrical system protection

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7500457B2 (en) 2006-04-13 2009-03-10 Denso Corporation Energization control apparatus and method for glow plug during the period from preglow to afterglow steps
DE102007000220B4 (en) * 2006-04-13 2009-09-24 Denso Corporation, Kariya-City Supply control apparatus and method for a glow plug during the period of preheat to Nachglühschritten

Also Published As

Publication number Publication date
KR0173091B1 (en) 1999-03-20
GB9614750D0 (en) 1996-09-04
DE19628683A1 (en) 1997-01-23
JPH0932606A (en) 1997-02-04
GB2303470B (en) 1999-01-06

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PCNP Patent ceased through non-payment of renewal fee

Effective date: 20000712