CN110410198B - Auxiliary exhaust brake system and exhaust brake method for supercharger - Google Patents
Auxiliary exhaust brake system and exhaust brake method for supercharger Download PDFInfo
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- CN110410198B CN110410198B CN201910694712.0A CN201910694712A CN110410198B CN 110410198 B CN110410198 B CN 110410198B CN 201910694712 A CN201910694712 A CN 201910694712A CN 110410198 B CN110410198 B CN 110410198B
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- 238000000034 method Methods 0.000 title claims description 10
- 238000002485 combustion reaction Methods 0.000 claims abstract description 9
- 239000007789 gas Substances 0.000 description 4
- 238000007789 sealing Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 239000002912 waste gas Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
- F02B37/12—Control of the pumps
- F02B37/24—Control of the pumps by using pumps or turbines with adjustable guide vanes
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- 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
- F02D41/0002—Controlling intake air
- F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/04—Engine intake system parameters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/101—Engine speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/60—Input parameters for engine control said parameters being related to the driver demands or status
- F02D2200/602—Pedal position
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Supercharger (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
The invention discloses an auxiliary exhaust brake system of a supercharger, an exhaust inlet of a variable-section supercharger of the auxiliary exhaust brake system is connected with an engine exhaust manifold of an engine body, an air outlet of the variable-section supercharger is connected with an engine air inlet pipe of the engine body through an intercooler, the variable section supercharger is internally provided with a supercharger variable section actuating mechanism, the ECU is used for receiving an accelerator pedal position signal, an engine rotating speed signal, an auxiliary braking state signal and an air inlet pressure signal which are respectively output by an accelerator pedal position sensor, an engine rotating speed sensor, an auxiliary braking relay and an air inlet pressure sensor, and the variable-section actuating mechanism of the supercharger is controlled according to the received position signal of the accelerator pedal, the rotating speed signal of the engine, the auxiliary braking state signal and the air inlet pressure signal, so that the size of the section of an air inlet channel of the variable-section supercharger is controlled. The invention can obviously improve the braking power of the internal combustion engine and the reliability of the exhaust system.
Description
Technical Field
The invention relates to the technical field of waste gas energy recovery of a supercharged internal combustion engine, in particular to an auxiliary exhaust braking system and an auxiliary exhaust braking method of a supercharger.
Background
The existing commercial vehicle generally adopts exhaust brake as auxiliary brake to improve the braking capability of the vehicle, and the basic working principle is to utilize an exhaust brake valve arranged in an exhaust passage to block the exhaust passage of an internal combustion engine. The exhaust stroke of the piston of the internal combustion engine in operation must overcome the pressure due to the increase of the exhaust resistance, and the piston is subjected to the counter pressure of gas and is transmitted to wheels through a crankshaft and a transmission system to force the vehicle to reduce the rotating speed, thereby achieving the purpose of reducing the vehicle speed in a short time, improving the braking capability, reducing the use of a service brake, reducing the abrasion and overheating of the service brake and ensuring the driving safety.
The utility model discloses a utility model patent that the publication number is CN204476572U discloses a waste gas bypass exhaust braking system, including turbo charger, exhaust brake valve, turbo charger includes interconnect's compressor, turbo charger, bypass valve, and the exhaust end of compressor communicates with each other with the air intake manifold of engine body, and turbo charger's inlet end, exhaust end communicate with each other with the exhaust manifold of engine body, the inlet end of exhaust brake valve respectively, and the inlet end, the exhaust end of bypass valve communicate with each other with the inlet end, the exhaust end of exhaust brake valve respectively. The structure can avoid the great influence of overlarge exhaust pressure on the turbocharger during auxiliary braking, thereby protecting the turbocharger.
It still has the following drawbacks:
1. the auxiliary braking power is low, the energy loss of the exhaust energy is caused by the supercharger, the exhaust braking valve and the connecting pipeline, the braking power is reduced, and especially when the internal combustion engine is at a medium-low rotating speed, the auxiliary braking power is low;
2. the structure is complicated, the exhaust brake valve, the connecting pipeline and the sealing element need to be connected, the sealing leakage risk is high, and the reliability of an exhaust system is poor.
3. The structure can avoid great influence on the turbocharger caused by overlarge exhaust pressure during auxiliary braking, when the exhaust brake valve is closed, the exhaust back pressure and the exhaust temperature are increased, the reliability of the turbocharger is influenced, and especially when the exhaust brake valve is stuck and fails, the reliability of the turbocharger is influenced.
Disclosure of Invention
The invention aims to provide a booster auxiliary exhaust braking system and an exhaust braking method, which can obviously improve the braking power of an internal combustion engine and the reliability of an exhaust system.
In order to achieve the purpose, the invention designs a booster auxiliary exhaust brake system, which comprises a variable section booster, an intercooler and an engine body, wherein an exhaust gas inlet of the variable section booster is connected with an engine exhaust manifold of the engine body, and an air outlet of the variable section booster is connected with an engine air inlet pipe of the engine body through the intercooler, and the booster auxiliary exhaust brake system is characterized in that: the variable-section supercharger comprises an engine, an engine speed sensor, an auxiliary brake relay, an air inlet pressure sensor, an ECU and a supercharger variable-section executing mechanism, wherein the engine speed sensor is used for receiving an engine speed signal, an auxiliary brake signal and an air inlet pressure signal, the engine speed signal, the auxiliary brake signal and the air inlet pressure signal are respectively output by the engine speed sensor, the auxiliary brake relay and the air inlet pressure sensor, and the ECU is also used for controlling the supercharger variable-section executing mechanism according to the received accelerator pedal position signal, the received engine speed signal, the received auxiliary brake signal and the received air inlet pressure signal so as to control the size of the section of an air inlet channel of the variable-section supercharger.
A supercharger-assisted exhaust brake method using the system of claim 1, comprising the steps of:
step 1: air enters the engine body through an air inlet pipe of the engine after being pressurized by the variable-section supercharger and the intercooler to participate in combustion and work, and then exhaust gas is discharged through an exhaust manifold of the engine and the variable-section supercharger;
step 2: the ECU acquires an accelerator pedal position signal, an engine rotating speed signal, an auxiliary braking signal and an air inlet pressure signal which are output by an accelerator pedal position sensor, an engine rotating speed sensor, an auxiliary braking relay and an air inlet pressure sensor in real time;
when the ECU determines that the auxiliary brake is started according to the auxiliary brake signal, the position signal of an accelerator pedal is in an accelerator-off state, and the rotating speed of the engine is more than or equal to 1000rpm, the ECU controls the variable section actuating mechanism of the supercharger to close an air inlet channel of the variable section supercharger;
when the ECU determines that the auxiliary brake is not started according to the auxiliary brake signal, the ECU acquires an air inlet pressure value through an air inlet pressure sensor, and controls a supercharger variable section execution mechanism according to the air inlet pressure value to adjust the section size of the air inlet channel of the variable section supercharger, so that the section of the air inlet channel of the variable section supercharger can be adjusted to meet the calibration of the corresponding engine MAP.
The invention has the beneficial effects that:
1. the invention closes the air inlet channel before the supercharger vortex by controlling the position of the variable cross section of the supercharger, realizes auxiliary exhaust braking, utilizes the exhaust energy before the supercharger vortex, has no exhaust energy loss through the supercharger, an exhaust brake valve and a connecting pipeline, and has high braking power (compared with the scheme of the background technology of the invention, the exhaust brake valve is adopted to realize auxiliary braking, the exhaust brake valve is arranged at the rear end of the turbocharger, and certain energy loss and reduction can be generated after the exhaust energy passes through the flow resistance of the supercharger);
2. the auxiliary exhaust brake is realized by using the variable-section supercharger, the structure is simple, the exhaust brake valves, the connecting pipelines, the sealing elements and the like are reduced, the number of parts is reduced, the leakage risk at the connecting sealing part is reduced, and the reliability of an exhaust system is improved; the exhaust brake is assisted before the supercharger by closing the air inlet channel before the supercharger, and the reliability of the supercharger is not influenced during auxiliary braking (in the scheme of the background technology, because the exhaust brake valve is arranged at the rear end of the supercharger, when the exhaust brake valve is closed and clamped, the exhaust back pressure of the supercharger is obviously increased and reaches more than 450KPa, oil leakage and failure of the supercharger are caused.
3. According to the invention, the ECU of the whole vehicle acquires signals of auxiliary brake, engine speed and accelerator pedal position, controls the variable cross section actuating mechanism of the supercharger, closes the air inlet channel of the volute of the supercharger, namely closes the exhaust channel of the engine, and realizes the auxiliary exhaust brake of the engine (the auxiliary brake signal controls the engine to open the auxiliary brake, controls the supercharger to close the exhaust channel, and realizes the auxiliary brake), so that the intelligent control is realized, and the responsiveness and reliability of the auxiliary brake are improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the system comprises an air filter 1, an air filter 2, a variable section supercharger 3, an intercooler 4, an engine air inlet connecting pipe 5, an engine air inlet pipe 6, an engine body 7, an engine exhaust manifold 8, a supercharger variable section actuating mechanism 9, an ECU 10, an auxiliary brake relay 11, an accelerator pedal position sensor 12, an engine rotating speed sensor 13, an exhaust pipeline 13 and an air inlet pressure sensor 14.
Detailed Description
The invention is described in further detail below with reference to the following figures and specific examples:
as shown in figure 1, the booster auxiliary exhaust brake system comprises a variable section booster 2, an intercooler 3 and an engine body 6, wherein an exhaust air inlet of the variable section booster 2 is connected with an engine exhaust manifold 7 of the engine body 6, an air outlet of the variable section booster 2 is connected with an engine air inlet pipe 5 of the engine body 6 through the intercooler 3, the booster auxiliary exhaust brake system further comprises an ECU9 and an air inlet pressure sensor 14 arranged in the engine air inlet pipe 5, a booster variable section actuating mechanism 8 is arranged in the variable section booster 2, the ECU9 is used for receiving an accelerator pedal position signal, an engine speed signal, an auxiliary brake signal and an air inlet pressure signal which are respectively output by an accelerator pedal position sensor 11, an engine speed sensor 12, an auxiliary brake relay 10 and the air inlet pressure sensor 14, and the ECU9 is further used for receiving the accelerator pedal position signal, the auxiliary brake, The engine speed signal, the auxiliary brake signal and the intake pressure signal are used for controlling the supercharger variable-section actuator 8 so as to control the size of the section of the intake passage of the variable-section supercharger 2.
In the above technical solution, the supercharger variable-section actuator 8 is installed in the turbine of the variable-section supercharger 2. An accelerator pedal position sensor 11 and an auxiliary brake relay 10 are arranged in a cab of the whole vehicle, an engine rotating speed sensor 12 is arranged on a flywheel shell of an engine, and the auxiliary brake relay 10 can be manually opened or closed by a driver.
Among the above-mentioned technical scheme, the air inlet of variable cross section booster 2 is used for passing through air cleaner 1 access air, and the input of intercooler 3 is connected to the air outlet of variable cross section booster 2, and the one end of engine air inlet connecting pipe 4 is connected to the output of intercooler 3, and the engine intake pipe 5 of engine block 6 is connected to the other end of engine air inlet connecting pipe 4.
In the above technical solution, the exhaust outlet of the variable-section supercharger 2 is connected to the exhaust pipe 13.
In the above technical solution, the signal output ends of the accelerator pedal position sensor 11, the engine speed sensor 12, the auxiliary brake relay 10 and the intake pressure sensor 14 are respectively connected to an accelerator pedal position signal input end, an engine speed signal input end, an auxiliary brake signal input end and an intake pressure signal input end of the ECU 9.
The invention has simple structure, realizes the intelligent control of the auxiliary braking of the engine, and effectively improves the auxiliary braking power, the braking responsiveness and the system reliability.
A supercharger-assisted exhaust brake method using the above system, comprising the steps of:
step 1: air is pressurized by the variable-section supercharger 2 and the intercooler 3 and then enters the engine body 6 through the engine air inlet pipe 5 to participate in combustion and work, and then exhaust gas is discharged through the engine exhaust manifold 7 and the variable-section supercharger 2;
step 2: the ECU9 acquires an accelerator pedal position signal, an engine speed signal, an auxiliary braking signal and an intake pressure signal which are output by an accelerator pedal position sensor 11, an engine speed sensor 12, an auxiliary braking relay 10 and an intake pressure sensor 14 in real time;
when the ECU9 determines that the auxiliary brake is started according to the auxiliary brake signal, the position signal of an accelerator pedal is in an accelerator-off state, and the rotating speed of the engine is more than or equal to 1000rpm, the variable cross section actuating mechanism 8 of the supercharger is controlled to close the air inlet channel of the variable cross section supercharger 2, so that the auxiliary exhaust brake function of the engine is realized;
when the ECU (9) determines that the auxiliary brake is not started according to the auxiliary brake signal, the ECU9 obtains an air inlet pressure value through the air inlet pressure sensor 14, and controls the supercharger variable-section actuating mechanism 8 according to the air inlet pressure value to adjust the size of the section of the air inlet channel of the variable-section supercharger 2, so that the section of the air inlet channel of the variable-section supercharger 2 is adjusted to meet the calibration of the corresponding engine MAP, and the performance calibration of the engine on power, oil consumption and emission is met.
Details not described in this specification are within the skill of the art that are well known to those skilled in the art.
Claims (3)
1. A supercharger-assisted exhaust brake method based on a supercharger-assisted exhaust brake system, the supercharger-assisted exhaust brake system comprising a variable-section supercharger (2), an intercooler (3) and an engine body (6), an exhaust gas inlet of the variable-section supercharger (2) is connected with an engine exhaust manifold (7) of the engine body (6), and an air outlet of the variable-section supercharger (2) is connected with an engine air inlet pipe (5) of the engine body (6) through the intercooler (3), characterized in that: the variable-section air inlet control system is characterized by further comprising an ECU (9) and an air inlet pressure sensor (14) arranged in an air inlet pipe (5) of the engine, wherein a supercharger variable-section executing mechanism (8) is arranged in the variable-section supercharger (2), the ECU (9) is used for receiving accelerator pedal position signals, engine speed signals, auxiliary braking signals and air inlet pressure signals which are respectively output by an accelerator pedal position sensor (11), an engine speed sensor (12), an auxiliary braking relay (10) and the air inlet pressure sensor (14), and the ECU (9) is further used for controlling the supercharger variable-section executing mechanism (8) according to the received accelerator pedal position signals, engine speed signals, auxiliary braking signals and air inlet pressure signals so as to control the size of the section of an air inlet channel of the variable-section supercharger (2);
the signal output ends of the accelerator pedal position sensor (11), the engine rotating speed sensor (12), the auxiliary brake relay (10) and the air inlet pressure sensor (14) are respectively connected with an accelerator pedal position signal input end, an engine rotating speed signal input end, an auxiliary brake signal input end and an air inlet pressure signal input end of the ECU (9);
an air inlet of the variable-section supercharger (2) is used for accessing air through an air filter (1), an air outlet of the variable-section supercharger (2) is connected with an input end of an intercooler (3), an output end of the intercooler (3) is connected with one end of an engine air inlet connecting pipe (4), and the other end of the engine air inlet connecting pipe (4) is connected with an engine air inlet pipe (5) of an engine body (6);
the booster assists the exhaust braking method, comprising the following step:
step 1: air enters an engine body (6) through an engine air inlet pipe (5) after being pressurized by a variable-section supercharger (2) and a intercooler (3) to participate in combustion and work, and then exhaust gas is discharged through an engine exhaust manifold (7) and the variable-section supercharger (2);
step 2: the ECU (9) acquires an accelerator pedal position signal, an engine rotating speed signal, an auxiliary braking signal and an air inlet pressure signal which are output by an accelerator pedal position sensor (11), an engine rotating speed sensor (12), an auxiliary braking relay (10) and an air inlet pressure sensor (14) in real time;
when the ECU (9) determines that the auxiliary brake is started according to the auxiliary brake signal, the position signal of an accelerator pedal is in an accelerator-off state, and the rotating speed of the engine is more than or equal to 1000rpm, the variable section actuating mechanism (8) of the supercharger is controlled to close an air inlet channel of the variable section supercharger (2);
when the ECU (9) determines that the auxiliary brake is not started according to the auxiliary brake signal, the ECU (9) acquires an air inlet pressure value through an air inlet pressure sensor (14), and controls a supercharger variable cross-section execution mechanism (8) according to the air inlet pressure value to adjust the size of the cross section of an air inlet channel of the variable cross-section supercharger (2), so that the cross section of the air inlet channel of the variable cross-section supercharger (2) is adjusted to meet the calibration of the corresponding engine MAP.
2. The supercharger-assisted exhaust brake method according to claim 1, characterized in that: an exhaust outlet of the variable-section supercharger (2) is connected with an exhaust pipeline (13).
3. The supercharger-assisted exhaust brake method according to claim 1, characterized in that: the supercharger variable-section actuating mechanism (8) is arranged in a turbine of the variable-section supercharger (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694712.0A CN110410198B (en) | 2019-07-30 | 2019-07-30 | Auxiliary exhaust brake system and exhaust brake method for supercharger |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910694712.0A CN110410198B (en) | 2019-07-30 | 2019-07-30 | Auxiliary exhaust brake system and exhaust brake method for supercharger |
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| CN110410198A CN110410198A (en) | 2019-11-05 |
| CN110410198B true CN110410198B (en) | 2020-07-10 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1364215A (en) * | 2000-03-07 | 2002-08-14 | 罗伯特-博希股份公司 | Method and device for regulating boost pressure of internal combustion engine |
| CN1886581A (en) * | 2003-11-27 | 2006-12-27 | 沃尔沃拉斯特瓦格纳公司 | Method for braking with an internal combustion engine having a variable turbo unit |
| JP2009108773A (en) * | 2007-10-30 | 2009-05-21 | Ihi Corp | Engine system |
| CN107228026A (en) * | 2016-03-24 | 2017-10-03 | 福特环球技术公司 | Method and system for boost control |
| JP2018031331A (en) * | 2016-08-26 | 2018-03-01 | 日野自動車株式会社 | Brake force adjustment device of compression pressure release-type engine brake |
-
2019
- 2019-07-30 CN CN201910694712.0A patent/CN110410198B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1364215A (en) * | 2000-03-07 | 2002-08-14 | 罗伯特-博希股份公司 | Method and device for regulating boost pressure of internal combustion engine |
| CN1886581A (en) * | 2003-11-27 | 2006-12-27 | 沃尔沃拉斯特瓦格纳公司 | Method for braking with an internal combustion engine having a variable turbo unit |
| JP2009108773A (en) * | 2007-10-30 | 2009-05-21 | Ihi Corp | Engine system |
| CN107228026A (en) * | 2016-03-24 | 2017-10-03 | 福特环球技术公司 | Method and system for boost control |
| JP2018031331A (en) * | 2016-08-26 | 2018-03-01 | 日野自動車株式会社 | Brake force adjustment device of compression pressure release-type engine brake |
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| CN110410198A (en) | 2019-11-05 |
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