Common rail diesel discussion thread

STD Tuning Engine Common rail diesel discussion thread

Common rail diesel discussion thread

Common rail diesel discussion thread

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baldur

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01-13-2019, 01:50 PM #1

It has been requested that I open a thread to discuss and share information about common rail diesel injection.
I am in the process of developing a controller to run solenoid controlled injectors, and plan to create a different power supply for piezoelectric injectors.
The difference there being that the solenoid injectors require high current and low voltage, although a moderate voltage (80 volts nominally) from a charged up capacitor is used to boost them during the opening phase to get a faster current rise. To keep them open requires only on the order of 6 volts.
Piezoelectric injectors on the other hand need a couple hundred volts to open, with high initial current and this voltage must be maintained to keep them open, at negligible current. Then in order to close them they require an inverse current as the piezoelectric element has internal capacitance that must be discharged.

Common rail is unique to most other injection control systems in that you have control over injection quantity and injection duration independently. Only other control system that offers this is hydraulically actuated unit injectors. Other solenoid controlled systems such as cam actuated unit injectors and injection pumps while allowing exact control of injection start and end do not have any way to control the rate of delivery during the injection.

One advantage offered by direct electronic injection control that is not possible with rack controlled injection pumps is the ability to have multiple injection events during the combustion cycle. This feature is not unique to common rail but is also possible with some solenoid valve controlled unit injectors and some solenoid valve controlled injection pumps.
The primary advantage of this is being able to use pre-injection to heat up the air prior to starting the main combustion event, as this accelerates ignition of the fuel injected for the main combustion event and thus reduces diesel knock which is caused by a too abrupt ignition of the fuel (too much fuel is introduced before it is able to ignite in the chamber)

I will add more information to this post later. Feel free to ask any questions.

Baldur Gislason

baldur

01-13-2019, 01:50 PM #1

It has been requested that I open a thread to discuss and share information about common rail diesel injection.
I am in the process of developing a controller to run solenoid controlled injectors, and plan to create a different power supply for piezoelectric injectors.
The difference there being that the solenoid injectors require high current and low voltage, although a moderate voltage (80 volts nominally) from a charged up capacitor is used to boost them during the opening phase to get a faster current rise. To keep them open requires only on the order of 6 volts.
Piezoelectric injectors on the other hand need a couple hundred volts to open, with high initial current and this voltage must be maintained to keep them open, at negligible current. Then in order to close them they require an inverse current as the piezoelectric element has internal capacitance that must be discharged.

Common rail is unique to most other injection control systems in that you have control over injection quantity and injection duration independently. Only other control system that offers this is hydraulically actuated unit injectors. Other solenoid controlled systems such as cam actuated unit injectors and injection pumps while allowing exact control of injection start and end do not have any way to control the rate of delivery during the injection.

One advantage offered by direct electronic injection control that is not possible with rack controlled injection pumps is the ability to have multiple injection events during the combustion cycle. This feature is not unique to common rail but is also possible with some solenoid valve controlled unit injectors and some solenoid valve controlled injection pumps.
The primary advantage of this is being able to use pre-injection to heat up the air prior to starting the main combustion event, as this accelerates ignition of the fuel injected for the main combustion event and thus reduces diesel knock which is caused by a too abrupt ignition of the fuel (too much fuel is introduced before it is able to ignite in the chamber)

I will add more information to this post later. Feel free to ask any questions.

Baldur Gislason

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1 Vote(s) - 5 Average

Messages In This Thread

Common rail diesel discussion thread - by baldur - 01-13-2019, 01:50 PM

RE: Common rail diesel discussion thread - by firen456 - 01-14-2019, 02:24 AM

RE: Common rail diesel discussion thread - by madmog - 01-29-2019, 05:12 PM

RE: Common rail diesel discussion thread - by barrote - 01-14-2019, 03:50 AM

RE: Common rail diesel discussion thread - by baldur - 01-29-2019, 12:45 PM

RE: Common rail diesel discussion thread - by AlanMcR - 01-30-2019, 12:04 AM

RE: Common rail diesel discussion thread - by firen456 - 01-30-2019, 02:56 AM

RE: Common rail diesel discussion thread - by barrote - 01-30-2019, 05:17 AM

RE: Common rail diesel discussion thread - by baldur - 01-30-2019, 06:25 AM

RE: Common rail diesel discussion thread - by starynovy - 02-02-2019, 02:05 PM

RE: Common rail diesel discussion thread - by Turbo - 02-03-2019, 03:02 AM

RE: Common rail diesel discussion thread - by baldur - 02-03-2019, 05:23 PM

RE: Common rail diesel discussion thread - by Motohead1 - 02-03-2019, 08:01 PM

RE: Common rail diesel discussion thread - by starynovy - 02-04-2019, 12:30 PM

RE: Common rail diesel discussion thread - by baldur - 02-04-2019, 04:30 PM

RE: Common rail diesel discussion thread - by engineengineer - 02-06-2019, 01:25 AM

RE: Common rail diesel discussion thread - by baldur - 02-06-2019, 04:40 AM

RE: Common rail diesel discussion thread - by atypicalguy - 02-06-2019, 04:16 AM

RE: Common rail diesel discussion thread - by baldur - 02-06-2019, 04:52 AM

RE: Common rail diesel discussion thread - by Sotvisp - 02-07-2019, 07:42 AM

RE: Common rail diesel discussion thread - by Sotvisp - 02-07-2019, 07:39 AM

RE: Common rail diesel discussion thread - by baldur - 02-07-2019, 08:28 AM

RE: Common rail diesel discussion thread - by baldur - 02-16-2019, 07:17 AM

RE: Common rail diesel discussion thread - by Motohead1 - 03-23-2019, 06:23 PM

RE: Common rail diesel discussion thread - by baldur - 03-24-2019, 12:53 PM

RE: Common rail diesel discussion thread - by Motohead1 - 03-24-2019, 09:34 PM

RE: Common rail diesel discussion thread - by madmog - 03-25-2019, 01:18 PM

RE: Common rail diesel discussion thread - by baldur - 03-26-2019, 05:36 AM

RE: Common rail diesel discussion thread - by madmog - 03-26-2019, 07:41 AM

RE: Common rail diesel discussion thread - by Langstrom - 04-17-2019, 08:49 AM

RE: Common rail diesel discussion thread - by baldur - 04-17-2019, 08:52 AM

RE: Common rail diesel discussion thread - by starynovy - 04-20-2019, 04:53 AM

RE: Common rail diesel discussion thread - by madmog - 05-11-2019, 06:35 AM

RE: Common rail diesel discussion thread - by baldur - 05-12-2019, 06:03 PM

RE: Common rail diesel discussion thread - by madmog - 05-13-2019, 02:14 PM

RE: Common rail diesel discussion thread - by atypicalguy - 07-29-2019, 11:04 PM

RE: Common rail diesel discussion thread - by baldur - 07-30-2019, 02:08 PM

RE: Common rail diesel discussion thread - by atypicalguy - 08-28-2019, 08:08 PM

RE: Common rail diesel discussion thread - by SurfRodder - 09-04-2019, 01:56 AM

RE: Common rail diesel discussion thread - by SurfRodder - 08-13-2019, 11:52 PM

RE: Common rail diesel discussion thread - by SurfRodder - 07-29-2019, 03:41 PM

RE: Common rail diesel discussion thread - by baldur - 08-14-2019, 01:18 PM

RE: Common rail diesel discussion thread - by baldur - 10-15-2019, 08:01 PM

RE: Common rail diesel discussion thread - by atypicalguy - 10-24-2019, 07:03 PM

RE: Common rail diesel discussion thread - by baldur - 10-24-2019, 10:35 PM

RE: Common rail diesel discussion thread - by SurfRodder - 11-03-2019, 08:02 PM

RE: Common rail diesel discussion thread - by orion - 10-31-2019, 06:23 PM

RE: Common rail diesel discussion thread - by baldur - 10-31-2019, 08:14 PM

RE: Common rail diesel discussion thread - by orion - 11-01-2019, 03:32 AM

RE: Common rail diesel discussion thread - by baldur - 11-22-2019, 10:29 AM

RE: Common rail diesel discussion thread - by SurfRodder - 11-23-2019, 11:18 AM

RE: Common rail diesel discussion thread - by 50harleyrider - 01-20-2020, 01:29 PM

RE: Common rail diesel discussion thread - by baldur - 01-20-2020, 02:37 PM

RE: Common rail diesel discussion thread - by Motohead1 - 11-22-2019, 09:52 PM

RE: Common rail diesel discussion thread - by baldur - 11-26-2019, 10:02 AM

RE: Common rail diesel discussion thread - by MartinB - 11-29-2019, 05:34 AM

RE: Common rail diesel discussion thread - by baldur - 11-29-2019, 02:40 PM

RE: Common rail diesel discussion thread - by ecFSE - 11-29-2019, 02:02 PM

RE: Common rail diesel discussion thread - by MartinB - 11-29-2019, 07:57 PM

RE: Common rail diesel discussion thread - by baldur - 11-30-2019, 03:22 AM

RE: Common rail diesel discussion thread - by starynovy - 11-30-2019, 08:19 AM

RE: Common rail diesel discussion thread - by baldur - 11-30-2019, 09:01 AM

RE: Common rail diesel discussion thread - by MTUPower - 12-01-2019, 09:15 AM

RE: Common rail diesel discussion thread - by baldur - 12-01-2019, 09:36 AM

RE: Common rail diesel discussion thread - by Sotvisp - 12-03-2019, 02:43 AM

RE: Common rail diesel discussion thread - by baldur - 12-03-2019, 08:30 AM

RE: Common rail diesel discussion thread - by MartinB - 12-03-2019, 06:16 PM

RE: Common rail diesel discussion thread - by baldur - 12-04-2019, 03:29 AM

RE: Common rail diesel discussion thread - by AlanMcR - 12-04-2019, 04:55 PM

RE: Common rail diesel discussion thread - by baldur - 12-04-2019, 06:28 PM

RE: Common rail diesel discussion thread - by baldur - 12-09-2019, 06:34 PM

RE: Common rail diesel discussion thread - by MTUPower - 12-10-2019, 07:28 PM

RE: Common rail diesel discussion thread - by baldur - 12-11-2019, 06:30 AM

RE: Common rail diesel discussion thread - by Drewkeen - 12-11-2019, 10:40 AM

RE: Common rail diesel discussion thread - by Sotvisp - 12-12-2019, 08:46 AM

RE: Common rail diesel discussion thread - by baldur - 12-12-2019, 10:18 AM

RE: Common rail diesel discussion thread - by MTUPower - 12-13-2019, 06:04 PM

RE: Common rail diesel discussion thread - by baldur - 12-13-2019, 08:16 PM

RE: Common rail diesel discussion thread - by atypicalguy - 01-01-2020, 02:15 PM

RE: Common rail diesel discussion thread - by baldur - 01-01-2020, 05:33 PM

RE: Common rail diesel discussion thread - by starynovy - 01-19-2020, 08:16 AM

RE: Common rail diesel discussion thread - by baldur - 01-19-2020, 09:44 AM

RE: Common rail diesel discussion thread - by starynovy - 01-19-2020, 12:37 PM

RE: Common rail diesel discussion thread - by starynovy - 01-19-2020, 12:38 PM

RE: Common rail diesel discussion thread - by starynovy - 01-19-2020, 01:00 PM

RE: Common rail diesel discussion thread - by starynovy - 01-19-2020, 01:16 PM

RE: Common rail diesel discussion thread - by baldur - 01-19-2020, 01:38 PM

RE: Common rail diesel discussion thread - by starynovy - 01-19-2020, 01:54 PM

RE: Common rail diesel discussion thread - by baldur - 01-20-2020, 03:48 PM

RE: Common rail diesel discussion thread - by INC - 01-21-2020, 02:24 PM

RE: Common rail diesel discussion thread - by atypicalguy - 01-21-2020, 07:47 PM

RE: Common rail diesel discussion thread - by diesel1972 - 01-22-2020, 05:54 AM

RE: Common rail diesel discussion thread - by starynovy - 01-24-2020, 04:31 PM

RE: Common rail diesel discussion thread - by diesel1972 - 01-25-2020, 06:49 AM

RE: Common rail diesel discussion thread - by starynovy - 01-26-2020, 02:33 PM

RE: Common rail diesel discussion thread - by baldur - 01-28-2020, 07:47 AM

RE: Common rail diesel discussion thread - by diesel1972 - 01-26-2020, 05:03 PM

RE: Common rail diesel discussion thread - by starynovy - 01-26-2020, 06:40 PM

RE: Common rail diesel discussion thread - by diesel1972 - 01-27-2020, 03:39 AM

RE: Common rail diesel discussion thread - by 50harleyrider - 01-27-2020, 06:47 PM

RE: Common rail diesel discussion thread - by starynovy - 01-28-2020, 10:11 AM

RE: Common rail diesel discussion thread - by Turbo - 02-10-2020, 04:29 PM

RE: Common rail diesel discussion thread - by starynovy - 02-12-2020, 08:13 AM

RE: Common rail diesel discussion thread - by Turbo - 02-20-2020, 09:13 AM

RE: Common rail diesel discussion thread - by Grecy - 03-19-2020, 08:40 PM

RE: Common rail diesel discussion thread - by baldur - 03-20-2020, 08:03 AM

RE: Common rail diesel discussion thread - by Grecy - 03-20-2020, 01:45 PM

RE: Common rail diesel discussion thread - by baldur - 03-20-2020, 06:36 PM

RE: Common rail diesel discussion thread - by Grecy - 03-20-2020, 07:54 PM

RE: Common rail diesel discussion thread - by diesel1972 - 03-22-2020, 12:27 PM

RE: Common rail diesel discussion thread - by baldur - 03-31-2020, 06:34 PM

RE: Common rail diesel discussion thread - by SurfRodder - 04-13-2020, 03:20 PM

RE: Common rail diesel discussion thread - by baldur - 04-13-2020, 06:16 PM

RE: Common rail diesel discussion thread - by SurfRodder - 05-26-2020, 10:36 AM

RE: Common rail diesel discussion thread - by atypicalguy - 08-14-2020, 09:30 AM

RE: Common rail diesel discussion thread - by baldur - 04-13-2020, 07:02 PM

RE: Common rail diesel discussion thread - by 50harleyrider - 09-09-2020, 08:01 PM

RE: Common rail diesel discussion thread - by baldur - 10-15-2020, 06:27 PM

RE: Common rail diesel discussion thread - by Grecy - 10-17-2020, 11:57 PM

RE: Common rail diesel discussion thread - by baldur - 10-19-2020, 06:39 AM

RE: Common rail diesel discussion thread - by atypicalguy - 02-05-2021, 10:42 AM

RE: Common rail diesel discussion thread - by baldur - 02-05-2021, 06:06 PM

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