CN105736086B - The engine braking methods and decompressor that burning braking is combined with pressure m - Google Patents
The engine braking methods and decompressor that burning braking is combined with pressure m Download PDFInfo
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- CN105736086B CN105736086B CN201610070923.3A CN201610070923A CN105736086B CN 105736086 B CN105736086 B CN 105736086B CN 201610070923 A CN201610070923 A CN 201610070923A CN 105736086 B CN105736086 B CN 105736086B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L13/00—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations
- F01L13/06—Modifications of valve-gear to facilitate reversing, braking, starting, changing compression ratio, or other specific operations for braking
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/08—Shape of cams
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/0242—Variable control of the exhaust valves only
- F02D13/0249—Variable control of the exhaust valves only changing the valve timing only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
- F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
- F02D13/04—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation using engine as brake
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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
- F02D37/00—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for
- F02D37/02—Non-electrical conjoint control of two or more functions of engines, not otherwise provided for one of the functions being ignition
-
- 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
- F02D41/30—Controlling fuel injection
- F02D41/38—Controlling fuel injection of the high pressure type
- F02D41/40—Controlling fuel injection of the high pressure type with means for controlling injection timing or duration
- F02D41/401—Controlling injection timing
-
- 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
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/045—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions combined with electronic control of other engine functions, e.g. fuel injection
-
- 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
- F02P5/00—Advancing or retarding ignition; Control therefor
- F02P5/04—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions
- F02P5/145—Advancing or retarding ignition; Control therefor automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions using electrical means
- F02P5/15—Digital data processing
- F02P5/1502—Digital data processing using one central computing unit
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0471—Assembled camshafts
- F01L2001/0473—Composite camshafts, e.g. with cams or cam sleeve being able to move relative to the inner camshaft or a cam adjusting rod
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0475—Hollow camshafts
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Theoretical Computer Science (AREA)
- Signal Processing (AREA)
- Valve Device For Special Equipments (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses the engine braking methods that a kind of braking of engine combustion is combined with pressure m, gasoline engine makes gasoline engine partial throttling, advanced ignition after the intake valve closes is burnt using engine charge, oil spout, igniting brake control module；Diesel engine carries out cylinder-in oil-jet in advance after the intake valve closes using oil spout brake control module, gas in the jar is made to burn as early as possible；Gas in the jar burns, and piston overpowers burnt gas pressure does negative work, and brake pressure increase improves braking power；Utilize engine pressure m control module, conventional ignition exhaust cam and braking exhaust cam is made to be moved to the second axial position from the first axial position on spline cam shaft, realize that engine is transformed into engine braking exhaust cam driving exhaust valve movement from conventional ignition exhaust cam driving exhaust valve movement, the exhaust valve movement of conventional ignition is eliminated, realizes the exhaust valve movement of engine braking.The invention also discloses a kind of engine decompression braking devices.
Description
Technical field
The present invention relates to engines, relate generally to engine braking field, and in particular to a kind of braking of engine combustion with
A kind of high-efficiency engine braking method that pressure m combines.
Background technology
In continuous lower long slope for a long time, when driving, brake shoes temperature rises rapidly caused by constantly touching on the brake in order to prevent
Height, brake efficiency are greatly lowered, and can not in emergency circumstances stop, and cause traffic safety Frequent Accidents, it is necessary to increase auxiliary
Help brake.
At present compared with other kinds of braking technology, engine braking technology has light weight, small, response time
Superperformances such as short, compact-sized, cheap, braking power is big and braking power is stablized etc. are widely used.Engine
Braking technology mainly includes engine towing astern, engine exhaust and brake and engine pressure m etc..
Engine towing astern is to overcome the mechanical friction loss of therein and drive the loss of engine accessory mechanism (such as
Injection pump, fan, generator etc.), pumping loss, compressed gas irreversible loss, transmission loss etc., so as to reach consumption automobile
Power makes the effect of vehicle deceleration.But during engine braking, the irreversible damage of engine pumping loss, compressed gas
Lose, transmission loss it is smaller, and with the development of engine technology, engine mechanical loss obtains very big reduction, thus merely according to
It is very limited by engine towing astern consumption power.
Engine exhaust and brake is on the basis of engine braking (towing astern), a butterfly is mounted on exhaust pipe
Valve, in order to increase the exhaust back pressure during engine exhaust and brake.Exhaust back pressure is increased during exhaust brake, with
The uplink of piston so that exhaust stroke becomes another compression stroke, the gas pair in exhaust stroke, piston compressing cylinder
Air work, increases the braking work of engine, and braking power increases.But it is still externally done in expansion stroke gas in the jar
Work, braking power is low, still cannot meet brake request.
Engine pressure m is to cut off fuel oil after starting brake apparatus, and piston reaches compression top center in compression stroke
Front opening exhaust valve discharges compressed air in cylinder, and making engine, air pressure is relatively low in cylinder, subtracts when expansion stroke starts
Few externally acting, so as to achieve the effect that increase braking power.But service brake access times are still when using pressure m
Very much, braking efficiency is low, still needs to that engine pressure m method is further improved.
Invention content
The purpose of the present invention is being directed to the problem of above-mentioned braking power is low, a kind of engine combustion braking and decompression are provided
The braking method combined is braked, realizes that when driving, brake control method is simple, there is higher braking work for continuous lower long slope for a long time
Rate, good braking effect realize the apparatus structure simple and compact of pressure m, solve the brake device structure technology complicated with control
Problem has a wide range of application.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of engine decompression braking device is provided, including normal ignition exhaust cam, braking exhaust cam, spline cam
Axis, axial movement driving mechanism；Spline axis cam is hollow shaft, and axial movement driving mechanism is mounted on the hollow of spline cam shaft
Portion；Axial movement driving mechanism includes driving piston and spring, spring one end are fixed, and the other end is connected to driving piston end surface
On；Normal ignition exhaust cam and braking exhaust cam are connect with spline cam shaft spline, normal ignition exhaust cam and system
Dynamic exhaust cam is structure as a whole, and there are one exhaust boss for normal ignition exhaust cam tool, and braking exhaust cam is with the first system
Dynamic exhaust boss and the second braking exhaust boss, and be vented boss, the first braking exhaust boss and the second braking exhaust boss and exist
Axially staggered distribution；Radial symmetric is set there are two splined shaft groove on spline axis cam, and braking exhaust cam is equipped with straight pin, circle
Pin passes through splined shaft groove to be connected in the driving pistion recess of driving piston outer periphery, makes normal ignition exhaust cam and braking
Exhaust cam can be with driving together with piston along the splined shaft groove of spline axis cam in the first axial position and the second axial position
It is moved between putting；It is additionally provided on spline cam shaft and the fuel feed hole of hollow portion unicom and unloads oilhole.
The present invention provides a kind of burning braking and decompression on the basis of a kind of engine decompression braking device is provided
The engine braking methods combined are braked, to use engine braking control module：Realize burning braking by for controlling vapour
The igniting brake control module of oil machine igniting, pressure m control engine decompression system by engine pressure m control module
Dynamic device.Therefore gasoline engine brake control module includes igniting brake control module and pressure m control module.
The engine braking methods include the following steps：
Step 1: when engine is not required to braking, the engine braking control module is not open-minded, the normal air inlet of engine
And oil spout, igniting brake control module and engine pressure m module do not work, engine normal combustion is described at this time to start
The normal ignition exhaust cam and braking exhaust cam of machine decompression braking device are located at the first axial position of spline cam shaft；
Step 2: engine braking operation starts, gasoline engine partial throttling starts air inlet and oil spout, igniting system
Dynamic control module work, making spark plug, advanced ignition is burnt after the intake valve closes, realizes engine combustion braking；Engine subtracts
Brake control module work is pressed, the normal ignition exhaust cam and braking exhaust cam for making the engine decompression braking device move
The second axial position of spline cam shaft is moved, engine braking exhaust cam driving exhaust valve movement realizes engine decompression
Braking.
The detailed process of igniting brake control module work is in the step 2：The igniting brake control module of gasoline engine
It is open-minded, the position of bent axle and spline cam shaft, the signal that electronic control unit is inputted according to sensor, meter are judged by sensor
Ignition advance angle is calculated, and result of calculation is changed into ignition control signal, control ignition system work is final to realize that spark plug exists
Advanced ignition is burnt after IC Intake Valve Closes, and piston is made burnt gas pressure to be overcome to do negative work in compression stroke, and brake pressure increases.
The detailed process of engine pressure m control module work is in the step 2：Pressure m control module is opened
Logical, two-bit triplet solenoid valves, machine oil enters spline cam shaft hollow part by fuel feed hole, positioned at spline cam shaft hollow part
Axial movement driving mechanism work, make be mounted on spline cam shaft on normal ignition exhaust cam and engine braking exhaust
Cam is moved to the second axial position from the first axial position, and hair is transformed into from normal ignition exhaust cam driving exhaust valve movement
Motivation braking exhaust cam driving exhaust valve movement；First braking exhaust boss of engine braking exhaust cam makes exhaust valve exist
It is opened before compression top center, gaseous mixture in release cylinder, reduces in-cylinder pressure, reduce and externally do work in exhaust stroke piston；Start
The second braking exhaust boss that mechanism moves exhaust cam opens exhaust valve lag, and exhaust stroke is made to become another compression
Stroke, the gas in exhaust stroke piston compressing cylinder do negative work, and braking power increases.
The present invention provides a kind of burning braking and decompression on the basis of a kind of engine decompression braking device is provided
The engine braking methods combined are braked, to use engine braking control module：Diesel engine realizes burning braking by being used for
The oil spout brake control module of diesel engine fuel injecting is controlled, pressure m controls engine by engine pressure m control module
Decompression braking device.Therefore diesel engine brake control module includes oil spout brake control module and pressure m control module.
The engine braking methods include the following steps：
Step 1: when engine be not required to braking when, the engine braking control module is not open-minded, engine normally into
Gas, oil spout brake control module and engine pressure m control module do not work, the normal oil spout of engine and burning, at this time institute
It states the normal ignition exhaust cam of engine decompression braking device and braking exhaust cam is located at the first axis of spline cam shaft
Position；
Step 2: engine braking operation starts, and the normal air inlet of diesel engine, the work of oil spout brake control module, inlet valve
Shift to an earlier date oil spout after closing to burn as early as possible, realize engine combustion braking；Engine pressure m module works, and makes the engine
The normal ignition exhaust cam and engine braking exhaust cam of decompression braking device are moved to the second axial direction of spline cam shaft
Position, engine braking exhaust cam driving exhaust valve movement, realizes engine pressure m.
The detailed process of oil spout brake control module work is in the step 2：The oil spout brake control module of diesel engine
Open-minded, electronic control unit controls the injection time of fuel injector and spray according to the signal of crankshaft sensor, camshaft-signal sensor
Oil mass realizes that engine shifts to an earlier date oil spout and burns as early as possible, and piston is made burnt gas pressure to be overcome to do negative work, braking pressure in compression stroke
Power increases.
The detailed process of engine pressure m control module work is in the step 2：Pressure m control module is opened
Logical, two-bit triplet solenoid valves, machine oil enters spline cam shaft hollow part by fuel feed hole, positioned at spline cam shaft hollow part
Axial movement driving mechanism work, make be mounted on spline cam shaft on normal ignition exhaust cam and engine braking exhaust
Cam is moved to the second axial position from the first axial position, and hair is transformed into from normal ignition exhaust cam driving exhaust valve movement
Motivation braking exhaust cam driving exhaust valve movement；First braking exhaust boss of engine braking exhaust cam makes exhaust valve exist
It is opened before compression top center, gaseous mixture in release cylinder, reduces in-cylinder pressure, reduce and externally do work in exhaust stroke piston；Start
The second braking exhaust boss that mechanism moves exhaust cam opens exhaust valve lag, and exhaust stroke is made to become another compression
Stroke, the gas in exhaust stroke piston compressing cylinder do negative work, and braking power increases.
It should be noted that the work of pressure m control module makes conventional ignition exhaust cam and engine braking exhaust convex
Take turns from the first axial position of spline cam shaft and be moved to the second axial position, need in gasoline engine ignition brake control module or
It is completed before the work of diesel engine fuel injecting brake control module.
The target that the present invention is reached is that (gasoline engine advanced ignition is burnt, and diesel engine shifts to an earlier date oil spout and uses up using advanced combustion
Early burning), it realizes in compression stroke piston upwards, burnt gas pressure is overcome to do negative work, and brake pressure increase improves system
Dynamic power；Conventional ignition exhaust cam driving exhaust valve movement is made to be transformed into engine braking using pressure m control module to arrange
Gas cam driven exhaust valve moves, and eliminates the exhaust valve movement of conventional ignition, realizes the exhaust valve movement of engine braking.It reduces
Engine externally does work in expansion stroke, and exhaust stroke is made to become another compression stroke, is compressed in exhaust stroke piston
Gas in cylinder does negative work, increases exhaust stroke braking power.
To sum up, the present invention is the engine braking methods combined using advanced combustion braking and pressure m, becomes a kind of
Efficient engine braking methods.
Description of the drawings
Attached drawing 1 is the schematic diagram of engine braking control module in the present invention
Attached drawing 2 is the brake apparatus schematic side view of engine pressure m control module in the present invention.
Attached drawing 3-1 is the brake apparatus main view for moving axially engine pressure m control module when driving mechanism does not work
Schematic diagram.
Attached drawing 3-2 is sectional view at A-A in Fig. 3-1
Attached drawing 3-3 is sectional view at B-B in Fig. 3-1
Attached drawing 4 is the brake apparatus main view signal of engine pressure m control module when moving axially driving mechanism work
Figure.
Routine valve stroke when attached drawing 5 is the conventional ignition exhaust cam work of the engine pressure m method of the present invention
Schematic diagram.
Attached drawing 6 is that the braking exhaust cam work schedule of the engine pressure m method of the present invention moves exhaust valve lift
With the schematic diagram of inlet valve lift.
In figure：
1- normal ignition exhaust cams, 2- braking exhaust cams, 3- spline cam shafts, 4- hang cupuliform mechanical tappets, 5- gas
Seat ring, 6- exhaust valves, 7- valve guide bushings, 8- valve spring, 9- valve collets, 10- cotter seats, 11- engine brakings
The axial movement driving mechanism of device, 12- fuel feed holes, 13- driving pistons, 14- driving pistion recess, 15- straight pins, 16- bullets
Spring, 17- unload oilhole, 18- spline cam shaft grooves, the first axial position of (one) spline cam shaft 3, (two) spline cam shaft 3
The second axial position, the braking exhaust boss of a- first, the braking exhaust boss of b- second, I-normal ignition inlet valve lift is bent
Line, II-normal ignition exhaust valve lift profile, III-the first braking exhaust valve lift profile, IV-the second braking exhaust valve lift
Curve
Specific embodiment
Below in conjunction with the accompanying drawings, the solution of the present invention is introduced：
Fig. 1 is the schematic diagram of the engine braking control module of the present invention.Gasoline engine brake control module includes igniting and makes
Dynamic control module and pressure m control module.Diesel engine brake control module includes oil spout brake control module and pressure m
Control module.
Refering to Fig. 2 to Fig. 4, engine decompression braking device, including normal ignition exhaust cam 1, braking exhaust cam 2,
Spline cam shaft 3, axial movement driving mechanism 11 etc..Spline cam shaft 3 is hollow shaft, and axial movement driving mechanism 11 is mounted on
The hollow part of spline cam shaft 3.Axial movement driving mechanism includes driving piston 13 and spring 16,16 1 end position of spring are consolidated
Fixed, the other end is connected on 13 end face of driving piston, there is driving pistion recess 14 on 13 periphery of driving piston.Normal point fire row
Gas cam 1 and braking exhaust cam 2 are connect with 3 spline of spline cam shaft, normal ignition exhaust cam 1 and braking exhaust cam
2 are an integral molding structure, and there are one exhaust boss, braking exhaust cam 2 includes the first braking and is vented normal ignition exhaust cam 1
The braking exhaust boss b of boss a and second, and boss, the first braking braking exhausts of exhaust boss a and second boss b are vented in axis
To being interspersed.Radial symmetric is set there are two splined shaft groove 18 on spline cam shaft 3, is braked and is radially provided on exhaust cam 2
Straight pin 15, straight pin 15 pass through splined shaft groove 18 to be connected in the driving pistion recess 14 of driving piston 13, make normal point
Fiery exhaust cam 1 and braking exhaust cam 2 can be with driving pistons 13 together along the splined shaft groove 18 of spline cam shaft 3 the
It is moved between one axial position and the second axial position.A fuel feed hole 12 is additionally provided on splined shaft 3 and one is unloaded oilhole 17, machine oil
It can be entered in splined shaft by fuel feed hole 12, by solenoid valve control, long-time can be flowed into from gap by unloading oilhole 17
Machine oil discharge.
Normal ignition exhaust cam 1 and braking exhaust cam 2 be integrally machined it is molding, but with different phases and
Lift.There are one boss for normal ignition exhaust cam 1, make exhaust valve normally-open, exhaust valve lift is as shown in Fig. 5 II.System
For dynamic exhaust cam 2 there are two boss, i.e., the first braking is vented the braking exhaust boss b of boss a and second, is respectively pressing exhaust valve
It opens before contracting stroke TDC and before exhaust top dead center, exhaust valve lift is as shown in Fig. 6 III, IV.
Normal ignition exhaust cam 1 and braking exhaust cam 2 are lived at splined shaft groove 18 by straight pin 15 and driving
The pistion recess 14 of plug 13 is clamped.When spring 16 is in normal condition, driving piston 13 (refers to Fig. 3-1) at the I of position, circle
Pin 15 makes normal ignition exhaust cam 1 and braking exhaust cam 2 be located at spline cam shaft in the right end of splined shaft groove 18
3 the first axial position, normal ignition exhaust cam 1 drive exhaust valve movement.When spring 16 is in compressive state, driving is lived
Plug (refers to Fig. 4) 13 at the II of position, and straight pin 15 makes 1 He of normal ignition exhaust cam in the left end of splined shaft groove 18
Braking exhaust cam 2 is located at the second axial position of spline cam shaft 3, and braking exhaust cam 2 drives exhaust valve movement.
The specific embodiment for the braking method that engine combustion is braked and pressure m combines：
To use engine braking control module：To realize burning braking, gasoline engine uses to control gasoline engine ignition
Igniting brake control module, diesel engine used for the oil spout brake control module that controls diesel engine fuel injecting, and pressure m leads to
Cross engine pressure m control module control engine decompression braking device.Therefore gasoline engine brake control module includes igniting and makes
Dynamic control module and pressure m control module；Diesel engine brake control module includes oil spout brake control module and pressure m
Control module.
When engine braking control module is not opened, normal air inlet and oil spout.Gasoline engine ignition brake control module (bavin
Oil machine oil spout brake control module) it does not work, engine normal ignition.Engine pressure m module does not work, at spring 16
In normal condition, driving piston 13 (refers to Fig. 3-1) at axial position I, straight pin 15 splined shaft groove 18 right end,
Make normal ignition exhaust cam 1 and brake the first axial position that exhaust cam 2 is located at spline cam shaft 3.The row of normal ignition
Gas cam 1 and braking exhaust cam 2 rotate on spline cam shaft 3 together, drive the exhaust cam 1 of normal ignition
Exhaust valve movement realizes the exhaust valve movement of normal ignition, and valve stroke makes engine in exhaust stroke as shown in Fig. 5 II
When exhauxt valve opens, gaseous mixture in release cylinder.Engine work at this time.
When the engine braking control module of gasoline engine is opened, partial throttling starts air inlet and oil spout, gasoline
Machine igniting brake control module work judges the position of bent axle and spline cam shaft 3, electronic control unit by sensor
(ECU) signal inputted according to sensor calculates ignition advance angle, and result of calculation is changed into ignition control letter according to program
Number, control ignition system work is final to realize spark plug advanced ignition burning after the intake valve closes, makes piston in compression stroke
Burnt gas pressure is overcome to do negative work, brake pressure increases, and improves braking power；
When the engine braking control module of diesel engine is opened, normal air inlet, diesel engine fuel injecting brake control module work
Make, electronic control unit (ECU) according to the signals such as crankshaft sensor, camshaft-signal sensor come control the injection time of fuel injector and
Distributive value realizes that engine shifts to an earlier date oil spout and burns as early as possible, piston is made burnt gas pressure to be overcome to do negative work in compression stroke, is braked
Pressure increases, and improves braking power.
When engine braking control module is opened, the pressure m module work of engine, when two-bit triplet solenoid valve
During energization, machine oil is entered by fuel feed hole 12 in splined shaft 3, the effect of spring 16 in oil pressure counter axial movement driving mechanism 11
Power makes spring 16 from normal condition to compressive state, and driving piston 13 is driven to be moved at axial position II, passes through straight pin 15
Normal ignition exhaust cam 1 and the right end of braking exhaust cam 2 from splined shaft groove 18 is made to be moved to splined shaft groove 18
Left end makes normal ignition exhaust cam 1 and brakes the second axial position that exhaust cam 2 moves together spline cam shaft 3
(such as Fig. 4) makes braking exhaust cam 2 drive exhaust valve movement, is first vented boss a driving exhaust valve movement (gas by the first braking
Door lift is as shown in Fig. 6 III), engine is made to open exhaust valve in compression stroke near top dead center, has fired mixing in release cylinder
Gas reduces in-cylinder pressure, reduces and externally do work in expansion stroke piston；Boss b driving exhaust valve fortune is vented by the second braking again
Dynamic (valve stroke is as shown in Fig. 6 IV), at exhaust stroke top dead center front row, valve is again turned on, and exhaust stroke is made to become another
An outer compression stroke, the gas in exhaust stroke piston compressing cylinder do negative work, increase braking power.When two-bit triplet electricity
When magnet valve powers off, machine oil is flowed out again by fuel feed hole 12, and spring 16 returns to normal condition, makes to be mounted on spline cam shaft 3
Conventional ignition exhaust cam 1 and engine braking exhaust cam 2 return to the first axial position from the second axial position, make engine
Braking exhaust cam 2 drives exhaust valve movement reconvert to drive exhaust valve movement to conventional ignition exhaust cam 1, realizes normal gas
Door movement.
To sum up, it is combined using the braking of engine advanced combustion and pressure m, realizes a kind of efficient engine braking side
Method.Engine advanced combustion (gasoline engine advanced ignition is burnt, and diesel engine shifts to an earlier date oil spout and burns as early as possible), realizes and lives in compression stroke
Plug moves upwards, and burnt gas pressure is overcome to do negative work, and brake pressure increase improves braking power；Pressure m control module
Conventional ignition exhaust cam driving exhaust valve movement is made to be transformed into engine braking exhaust cam driving exhaust valve movement, is eliminated normal
The exhaust valve movement of igniting is advised, realizes the exhaust valve movement of engine braking.It reduces engine externally to do work in expansion stroke, make
Exhaust stroke becomes another compression stroke, and the gas in exhaust stroke piston compressing cylinder does negative work, makes exhaust stroke
Braking power increases.
Claims (6)
1. a kind of engine decompression braking device, which is characterized in that including normal ignition exhaust cam (1), braking exhaust cam
(2), spline cam shaft (3), axial movement driving mechanism (11)；Spline cam shaft (3) is hollow shaft, moves axially driving mechanism
(11) mounted on the hollow part of spline cam shaft (3)；It moves axially driving mechanism and includes driving piston (13) and spring (16), bullet
Spring (16) one end is fixed, and the other end is connected on driving piston (13) end face；Normal ignition exhaust cam (1) and braking exhaust are convex
Wheel (2) is connect with spline cam shaft (3) spline, and normal ignition exhaust cam (1) and braking exhaust cam (2) are integrated knot
Structure, there are one exhaust boss, there is braking exhaust cam (2) normal ignition exhaust cam (1) tool the first braking to be vented boss (a)
Boss (b) is vented, and exhaust boss, the first braking exhaust boss (a) and second brake exhaust boss (b) in axis with the second braking
To being interspersed；Radial symmetric is set there are two splined shaft groove (18) on spline cam shaft (3), and braking exhaust cam (2) is equipped with
Straight pin (15), straight pin (15) are connected to the driving pistion recess of driving piston (13) periphery across splined shaft groove (18)
(14) in, make normal ignition exhaust cam (1) and braking exhaust cam (2) can be with driving piston (13) together along spline cam
The splined shaft groove (18) of axis (3) moves between the first axial position and the second axial position；Spline cam shaft is additionally provided on (3)
With the fuel feed hole (12) of hollow portion unicom and unloading oilhole (17).
2. a kind of hair that burning braking using engine decompression braking device as described in claim 1 is combined with pressure m
Motivation braking method, which is characterized in that engine braking control module, the igniting system including being used to control gasoline engine ignition are provided
Dynamic control module, the pressure m control module for controlling engine decompression braking device；The engine braking methods include
Following steps：
Step 1: when engine is not required to braking, the engine braking control module is not open-minded, the normal air inlet of engine and spray
Oil, igniting brake control module and engine pressure m control module do not work, the burning of engine normal ignition, described at this time
The normal ignition exhaust cam and braking exhaust cam of engine decompression braking device are located at the first axis position of spline cam shaft
It puts；
Step 2: engine braking operation starts, gasoline engine partial throttling starts air inlet and oil spout, igniting braking control
Molding block works, and making spark plug, advanced ignition is burnt after the intake valve closes, realizes engine combustion braking；Engine decompression system
Dynamic control module work, the normal ignition exhaust cam and braking exhaust cam for making the engine decompression braking device are moved to
The second axial position of spline cam shaft, engine braking exhaust cam driving exhaust valve movement, realizes engine pressure m.
3. the engine braking methods that burning braking according to claim 2 is combined with pressure m, which is characterized in that institute
Stating the detailed process that brake control module works of lighting a fire in step 2 is：The igniting brake control module of gasoline engine is open-minded, passes through
Sensor judges the position of bent axle and spline cam shaft, and the signal that electronic control unit is inputted according to sensor calculates igniting and carries
Anterior angle, and result of calculation is changed into ignition control signal, control ignition system work is final to realize that spark plug is closed in inlet valve
Rear advanced ignition burning is closed, piston is made burnt gas pressure to be overcome to do negative work in compression stroke, brake pressure increases.
4. a kind of hair that burning braking using engine decompression braking device as described in claim 1 is combined with pressure m
Motivation braking method, which is characterized in that engine braking control module, the oil spout system including being used to control diesel engine fuel injecting are provided
Dynamic control module, the pressure m control module for controlling engine decompression braking device；The engine braking methods include
Following steps：
Step 1: when engine is not required to braking, the engine braking control module is not open-minded, the normal air inlet of engine, spray
Oil brake control module and engine pressure m control module do not work, the normal oil spout of engine and burning, at this time the hair
The normal ignition exhaust cam and braking exhaust cam of motivation decompression braking device are located at the first axial position of spline cam shaft；
Step 2: engine braking operation starts, and the normal air inlet of diesel engine, the work of oil spout brake control module, IC Intake Valve Closes
Shift to an earlier date oil spout afterwards to burn as early as possible, realize engine combustion braking；Engine pressure m control module works, and makes the engine
The normal ignition exhaust cam and engine braking exhaust cam of decompression braking device are moved to the second axial direction of spline cam shaft
Position, engine braking exhaust cam driving exhaust valve movement, realizes engine pressure m.
5. the engine braking methods that burning braking according to claim 4 is combined with pressure m, which is characterized in that institute
Stating the detailed process that oil spout brake control module works in step 2 is：The oil spout brake control module of diesel engine is open-minded, electronics
Control unit controls the injection time of fuel injector and distributive value according to the signal of crankshaft sensor, camshaft-signal sensor, realizes
Engine shifts to an earlier date oil spout and burns as early as possible, and piston is made burnt gas pressure to be overcome to do negative work in compression stroke, and brake pressure increases.
6. the engine braking methods that the burning braking according to claim 2 or 4 is combined with pressure m, feature exist
In the detailed process that engine pressure m control module works in the step 2 is：
Pressure m control module is open-minded, two-bit triplet solenoid valves, and it is hollow that machine oil by fuel feed hole enters spline cam shaft
Portion, the axial movement driving mechanism positioned at spline cam shaft hollow part work, and make the normal ignition being mounted on spline cam shaft
Exhaust cam and engine braking exhaust cam are moved to the second axial position from the first axial position, are vented from normal ignition convex
Wheel drive exhaust valve movement is transformed into engine braking exhaust cam driving exhaust valve movement；The of engine braking exhaust cam
One braking exhaust boss makes exhaust valve be opened before compression top center, and gaseous mixture in release cylinder reduces in-cylinder pressure, reduces and arranging
Gas reciprocating piston externally does work；Second braking exhaust boss of engine braking exhaust cam opens exhaust valve lag, makes row
Gas stroke becomes another compression stroke, and the gas in exhaust stroke piston compressing cylinder does negative work, and braking power increases.
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| CN106769073B (en) * | 2017-03-15 | 2023-04-07 | 西华大学 | Experimental device and experimental method for simulating single combustion in engine cylinder |
| DE102017003081A1 (en) * | 2017-03-31 | 2018-10-04 | Man Truck & Bus Ag | Variable valve train with brake cam |
| TR201720332A2 (en) | 2017-12-14 | 2019-07-22 | Ford Otomotiv Sanayi As | A CULTIVATOR MECHANISM |
| CN108412569B (en) * | 2018-03-26 | 2023-04-28 | 上海工程技术大学 | Water spray exhaust valve |
| CN109098869A (en) * | 2018-09-28 | 2018-12-28 | 奇瑞汽车股份有限公司 | Hybrid power engine piston stop position control method |
| US10550772B1 (en) * | 2018-10-23 | 2020-02-04 | GM Global Technology Operations LLC | Camshaft assembly and method of operating the same |
| CN109736958A (en) * | 2019-03-21 | 2019-05-10 | 潍柴动力股份有限公司 | A method of improving engine brake power |
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| JPH1089033A (en) * | 1996-09-19 | 1998-04-07 | Hino Motors Ltd | Valve system of engine |
| JP3983016B2 (en) * | 2001-07-16 | 2007-09-26 | 本田技研工業株式会社 | 4-stroke internal combustion engine valve deactivation mechanism |
| DE10337430A1 (en) * | 2003-08-13 | 2005-03-17 | Fev Motorentechnik Gmbh | Internal combustion engine with shift cam |
| DE102010018208A1 (en) * | 2010-04-26 | 2011-10-27 | Schaeffler Technologies Gmbh & Co. Kg | Hydraulic valve clearance compensation element for reciprocating internal combustion engines |
| CN102635418A (en) * | 2011-02-15 | 2012-08-15 | 奚勇 | Method and device for resetting valve lift for engine brake |
| CN104454178A (en) * | 2014-11-06 | 2015-03-25 | 上海尤顺汽车部件有限公司 | Engine braking method |
| CN104819025A (en) * | 2015-03-11 | 2015-08-05 | 重庆交通大学 | Engine valve control system |
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