CN105658936A

CN105658936A - Engine power boost system and method

Info

Publication number: CN105658936A
Application number: CN201380077479.2A
Authority: CN
Inventors: 林伟青; 邓永翰
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2013-06-14
Filing date: 2013-06-14
Publication date: 2016-06-08
Anticipated expiration: 2033-06-14
Also published as: DE112013007158T5; CN105658936B; WO2014198065A1

Abstract

An engine power boost system for an internal combustion engine, a corresponding method and an excavator are disclosed. The system comprises sensing means for sensing a load intended to be overcome by the engine during the operation of the engine, and an engine controller connected with the engine and the sensing means for receiving load information from the sensing means and controlling the operation of the engine. The engine controller is configured to activate an engine power boost by increasing the limit of fuel injection quantity of the engine from a standard injection quantity limit to an increased injection quantity limit when the load information indicates that the load is increased over a load threshold, and to end the engine power boost by recovering the standard injection quantity limit after the engine power boost has been activated for a preset duration. The engine can be protected effectively by means of the system and method of the disclosure.

Description

Engine power lifting system and method

Technical field

The present invention relates to a kind of engine power lifting system and method, it can be applied in the vehicle or equipment being equipped with oil engine.

Background technology

Electronic regulator is had, for controlling the torque/speed of engine by the vehicle of automatically controlled internal combustion engine drive or equipment configuration. Once detect that overload is dangerous, engine is improved engine and limits at full capacity so that engine operates with more high torque (HT) by controlling. The restriction raised can be enabled in short time period, afterwards, recovers original restriction, in order to control engine power.

Citing, patent documentation US2007028892A1 discloses a kind of oil engine, it has the power-lift function that can recover rotating speed, wherein, when determining the running speed reduction causing engine due to external load, fuel injection amount is increased to more than specified maximum fuel work output by controlling by the operation of fuel system. Next, after motor speed is resumed, the operation of fuel system returns rated condition.

For being recovered by engine power lifting implementation motor speed, at increase fuel injection amount during long-play, Engine Durability is challenged. Additionally, it is desirable between speed decubation the same each functional component driven by the engine of cooperation control, to protect engine and these functional components.

Summary of the invention

It is an object of the present invention to provide the engine power enhanced feature of improvement, it can effectively protect engine during power-lift.

According to an aspect of the present invention, it provides a kind of powered lift system for explosive motor, comprising: device is surveyed in sense, and it is surveyed for feeling and expects by means of the load that engine overcomes during power operation; And engine controller, which is connected described engine and sense survey device, for receiving the load information from described sense survey device and control the operation of engine; Wherein, described engine controller is configured to, when described load information indicates load to increase to above a load threshold, by the emitted dose that the restriction of the fuel injection amount of engine brings up to a rising from a standard emitted dose restriction is limited and starting engine power-lift, and terminate engine power promote by recovering the restriction of standard emitted dose after engine power lifting has been activated a preset period of time.

Preferably, described engine controller is configured to follow next-door neighbour forbid engine power lifting in a forbidding period of described preset period of time further.

Preferably, described engine controller is configured to monitor the Driving Torque of engine further, and when engine Driving Torque close to or be positioned at limit with standard emitted dose corresponding model engine at full capacity on curve time starting engine power-lift.

Preferably, described engine controller is configured to monitor the fuel injection amount of engine further, and when the fuel injection amount of engine is higher than starting engine power-lift during a fuel injection amount threshold value.

Preferably, described fuel injection amount threshold value is about 90% to about the 100% of standard emitted dose restriction.

Preferably, described engine controller is configured to monitor the rotating speed of engine further, and when the rotating speed loss of engine is higher than starting engine power-lift during a rotating speed loss threshold value.

Preferably, described rotating speed loss threshold value is about 40rpm to about 60rpm.

Preferably, described engine power lifting system also comprises functional component control device, and it is integrated in or connects engine controller, for controlling functions parts, described functional component by engine driven to produce the operational power resisting described load; Wherein, described functional component control device is formed at the operational power improving described functional component in described preset period of time.

Preferably, described functional component control device is configured to further, in described preset period of time when the rotating speed loss of engine and/or torque are higher than corresponding default maximum level, reduces the operational power of described functional component.

Preferably, described engine is the engine of vehicle or equipment, the engine of such as Architectural Equipment.

According to a further aspect in the invention, it provides a kind of excavator, it comprises engine; Hydraulic efficiency system driven by the engine; With previously described engine power lifting system, for providing engine power enhanced feature to engine.

Preferably; described engine power lifting system also comprises hydraulic protecting module; it is formed at the hydrodynamicpressure that engine power promotes when being activated in raising hydraulic efficiency system, and when the rotating speed loss of engine and/or torque are higher than the hydrodynamicpressure reducing or discharging in hydraulic efficiency system during corresponding default maximum level in described preset period of time.

Preferably, described hydraulic protecting module is integrated in engine controller, or is formed as independent hydrauliccontroller and is connected between described engine controller and hydraulic efficiency system.

According to another aspect of the invention, it provides a kind of engine power method for improving for explosive motor, comprising: sense survey is expected by the load that engine overcomes during power operation; When load information indicates load to increase to above a load threshold, by the emitted dose that the restriction of the fuel injection amount of engine brings up to a rising from a standard emitted dose restriction is limited and starting engine power-lift; And terminate engine power promote by recovering the restriction of standard emitted dose after engine power lifting has been activated a preset period of time.

Preferably, described engine power method for improving also comprises: follows next-door neighbour and forbids engine power lifting in a forbidding period of described preset period of time.

Preferably, described engine power method for improving also comprises: the operational power improving functional component in described preset period of time, described functional component by engine driven to produce the operational power resisting described load.

Preferably, described engine power method for improving also comprises: in described preset period of time when the rotating speed loss of engine and/or torque are higher than corresponding default maximum level, reduce the operational power of described functional component.

According to the present invention, it is possible to effectively protect engine from loss during engine power promotes.

Accompanying drawing explanation

Fig. 1 is the schematic diagram of the equipment with engine power enhanced feature according to first embodiment of the invention;

Fig. 2 is the diagram representing engine restrictive curve at full capacity.

Fig. 3 is the diagram of the skew of restrictive curve at full capacity representing the engine power enhanced feature according to the present invention.

Fig. 4 is the diagram of some factors considered in the engine power enhanced feature of the present invention.

Fig. 5 is the logical diagram of the engine power enhanced feature of the present invention.

Fig. 6 is the schematic diagram of the equipment with engine power enhanced feature according to second embodiment of the invention;

Fig. 7 represents restrictive curve and the diagram according to the hydraulic efficiency system Collaborative Control in the equipment of embodiment of the present invention at full capacity;

Fig. 8 is the diagram of the example fuel injection control strategy of the engine power enhanced feature representing the present invention.

Fig. 9 is the schema representing the power-lift function according to embodiment of the present invention; And

Figure 10 is the schema representing the hydraulic protecting function according to embodiment of the present invention.

Embodiment

Some preferred implementations of engine power enhanced feature according to the present invention are described below with reference to accompanying drawings.

First, it should be pointed out that, the engine power enhanced feature of the present invention can be applied to the various vehicle and the equipment that are equipped with oil engine, such as Architectural Equipment, excavator etc. as shown in Figure 1.

As can see from Figure 1, excavator comprises oil engine 10, for driving, excavator moves on ground for it, hydraulic efficiency system 20 (two pump is illustrated in the drawings), it also is driven to perform dredge operation by engine 10, with engine electronic control system device 30, which is connected engine 10 and hydraulic efficiency system 20, for receiving their operating parameters and control their operation.

Hydraulic efficiency system 20 bears load 40 in digging operations, and this causes the pressure in hydraulic efficiency system 20 to change. Engine controller 30 receive sensing device senses to hydraulic efficiency system 20 in pressure information (sign as load), the operating parameters of hydraulic efficiency system 20, the speed of such as pump, with the operation information of engine 10, such as motor speed and torque, to control engine 10 and the operation of hydraulic efficiency system 20.

Each engine known has fixing (rotary speed-torque) curve at full capacity for given fuel injection amount, as shown in Figure 2. In other words, at each tachometer value, engine can only pass out fixing torque capacity. In general, engine should some work below curve at full capacity, such as, the point 1 in Fig. 2. If the load of engine raises, torque can bring up to the point 2 close to curve at full capacity. Then, if torque continues to raise, operational stage can move to a little 3 from point 2 along curve at full capacity. At point 3, torque is increased to maximum level, but motor speed reduces relative to the rotating speed putting 2 places. The reduction of motor speed may cause the degradation of engine. Such as, if motor speed declines from the point 3 presenting torque capacity, torque also declines together with motor speed, not only has low torque but also have the point 4 of the slow speed of revolution consequently, it is possible to arrive, and even engine may put 5 stalls.

For given fuel injection amount, engine can always with fixing curve manipulation at full capacity. Like this, once excavator overload, namely motor speed decline be sensed, and then hydraulic efficiency oil is transmitted and returns to fuel tank, and this can cause power loss.

Forwarding the excavator shown in Fig. 1 to, once sense overload in hydraulic efficiency system 20, such as excavator encounters boulder in operating with digging, and the engine 10 being connected with hydraulic efficiency system just has the danger of overload. In this case, the basic design of the engine power enhanced feature according to the present invention, as shown in Figure 3, spray into the fuel quantity in engine 10 to be controlled by engine controller 30 and increase in short preset period of time �� t, engine 10 is run outside model engine at full capacity curve E1, and with the engine that raises at full capacity curve E2 operate to perform engine power enhanced feature. Curve T with arrow can represent the real work torque of engine 10, with the change of real work torque shown in dredge operation. It may be seen that for each motor speed n, the model engine maximum feasible torque T1 that curve E1 defines at full capacity can increase to the engine maximum feasible torque T2 that curve E2 defines at full capacity of rising, and the real work torque T of engine_activeCan between two maximum feasible torque T1 and T2.

It can also be seen that real work torque curve T and model engine have two intersection point C1 and C2 at full capacity between curve E1 from Fig. 3. When the actual operating state arrival of engine 10 maybe will arrive the first intersection point C1, engine controller 30 increases fuel injection amount to present the engine curve E2 at full capacity of rising. Then, after have passed through preset period of time �� t, engine controller 30 recovers standard fuel emitted dose to present model engine curve E1 at full capacity. Preset period of time �� t is confirmed as making, and on the one hand, engine overload ability improves to overcome the load of the increase often run in dredge operation effectively, on the other hand, it is possible to suppress the weather resistance deterioration of engine.

Desirable ground, preset period of time �� t is confirmed as making, and in most of the cases, the 2nd intersection point C2 drops in preset period of time �� t. But; load too high and when cannot overcome (even the engine curve E2 at full capacity by raising); engine controller 30 also can recover model engine curve E1 at full capacity after have passed through preset period of time �� t, to protect engine 10, as described later.

It is noted that engine power enhanced feature both can be triggered by engine controller 30 as previously mentioned automatically, it is also possible to by excavator operator by manual triggerings such as buttons.

In order to trigger engine power enhanced feature, it is necessary to some or all in satisfied condition below.

1) a �� n > ultimate value, wherein, as shown in Figure 4, the present engine rotating speed n that �� n equals the P1 place, working point in model engine at full capacity curve E1 subtracts the motor speed n0 corresponding with the torque capacity rank T1max on model engine at full capacity curve E1 (if �� n is too little, motor speed rapid decrease may be there is, even after triggering engine power enhanced feature);

2) motor torque arrive or close to model engine curve E1 (at working point P2) at full capacity;

3) elevation amplitude pumping pressure of hydraulic efficiency system 20 is more than a ultimate value; And

4) fall of motor speed is more than a ultimate value.

At working point P2, engine power enhanced feature is triggered so that motor torque can increase to, from the torque that working point P2 presents, the torque (the engine curve E2 at full capacity close to raising) that P3 place, working point presents, and does not cause motor speed significantly to decline.

Then, if motor torque increases further, operational stage along the engine raised at full capacity curve E2 be displaced to working point P4 from working point P3, wherein working point P4 embodies the engine torque capacity rank T2max on curve E2 at full capacity raised, and T2max �� T higher than T1max. In this stage, motor speed decline than from working point P2 in the stage of working point P3 faster.

After have passed through preset period of time �� t, engine power enhanced feature terminates, no matter whether the operational stage of engine 10 falls into model engine region below curve E1 at full capacity. Then, in the extra period after preset period of time �� t neighbour, engine power enhanced feature is disabled, avoids because of starting engine power-lift function repeatedly to protect engine 10 and impaired. Therefore, this extra period can be called the forbidding period.

Fig. 5 is the logical diagram of the engine power enhanced feature performed by engine controller 30. In block B1, motor speed and/or hydraulic pressure pressure are sensed. Block B1 connects and wherein stores first or the model engine block B2 of torque limitation and wherein store the block B3 of the 2nd or the engine that raises torque limitation at full capacity at full capacity. Block B2 and B3 connects the block B4 performing handoff functionality.

On the other hand, block B5 is triggering device, and it sends with the triggering signal represented by block B6. The block B7 being arranged in block B6 downstream receives the triggering signal of block B6. The block B8 being arranged in block B7 downstream allows the triggering signal of block B7 to be passed to block B9 after have passed through preset period of time. Triggering signal in block B6 is also passed to block B9. Block B9 is to the computing of the triggering signal actuating logic "AND" from block B6 and B8, and consequential signal is sent to block B4, one of block B2 and B3 is optionally connected to the block B10 in downstream by block B4, and in block B10, motor torque restriction is set to the restriction of criteria limit or rising. In downstream block B11, fuel injection amount is determined.

When block B9 receives identical signal from block B6 and B8, block B9 sends a signal to block B4 to access block B3 and starting engine power-lift function. Then, after experienced by preset period of time, block B9 receives signal opposite each other from block B6 and B8, and sends a signal to block B4 to access block B2 and to recover model engine operation by terminating engine power enhanced feature.

Shown in Fig. 1 as, in the excavator of first embodiment of the invention, engine power enhanced feature can realize by engine electronic control system device 30. Engine electronic control system device 30 can be the ECU (electronically controlled unit) of engine 10, it is also possible to be the separate controller being connected with Engine ECU.

Second embodiment of the invention, hydraulic protecting function is added on the basis of the power-lift function described in the first embodiment. Specifically, excavator shown in Fig. 6 comprises oil engine 10, for driving, excavator moves on ground for it, hydraulic efficiency system 20, it also is driven to perform dredge operation by engine 10, engine electronic control system device 30, which is connected engine 10, for receiving engine operation parameters and the operation of control engine, with hydrauliccontroller 50, which is connected or it is integrated in engine electronic control system device 30, and also connect hydraulic efficiency system 20, to receive the pressure information caused in hydraulic efficiency system 20 by load 40 and the operation of hydraulic control system 20.

Excavator shown in Fig. 6 can be worked in coordination with and be performed engine power enhanced feature and hydraulic protecting function. Specifically, Fig. 7 respectively illustrates the skew of restrictive curve at full capacity of engine 10 and the restrictive curve at full capacity of hydraulic efficiency system 20 offsets in its right part and left part.

The skew of restrictive curve at full capacity of engine 10 is similar to shown in Fig. 3, that is, engine 10 has the engine curve E2 at full capacity of model engine curve E1 and rising at full capacity, and hydraulic efficiency system 20 correspondingly has the hydraulic pressure curve L2 at full capacity of standard hydraulic pressure curve L1 and rising at full capacity. When engine 10 controlled by engine controller 30 and exceed model engine at full capacity curve E1 operate, and when with the engine that raises, curve E2 operates and perform engine power enhanced feature at full capacity, hydraulic efficiency system 20 be hydraulically controlled device 50 control and from standard hydraulic pressure at full capacity curve L1 be displaced to the hydraulic pressure curve L2 at full capacity of rising.

Excavator according to Fig. 6, and with reference to Fig. 7, when load 40 raises, at the working point P1 (close to model engine curve E1 at full capacity) of engine, engine power enhanced feature is activated, it is possible to automatically started by engine controller 30 or by excavator operator by start-up by hand such as buttons. Then engine at full capacity curve bring up to E2 from E1. The working point of engine can be displaced to from working point P1 and be positioned at or slightly higher than the working point P2 of model engine curve E1 at full capacity. At working point P2, motor torque and hydraulic pressure pressure are all higher than P1 place, working point.

Continuing to raise along with load 40, the engine that the working point of engine can be displaced to rising from working point P2 is the working point P3 curve E2 at full capacity. In this state, engine controller 30 will judge whether load 40 can be overcome. If overcome, motor torque and hydraulic pressure pressure will reduce, and the working point of engine will be displaced to the model engine working point P2 ' on curve E1 at full capacity, and then engine controller 30 stops engine power enhanced feature. On the other hand; if engine controller 30 judges that load 40 cannot overcome; such as; by improving motor torque and hydraulic pressure pressure continuously from working point P3; the pressure that engine controller 30 order hydrauliccontroller 50 reduces in hydraulic efficiency system 20 on one's own initiative is displaced to P2 from working point P3 in the working point of engine to force, impaired to protect hydraulic efficiency system 20 to avoid under lasting high pressure. When the pressure in hydraulic efficiency system 20 is actively reduced, therefore the torque of engine 10 also reduces. Like this, this kind of hydraulic protecting function is utilized also to protect engine 10.

As the auxiliary protection to engine, for engine power enhanced feature is equipped with two timing registers, as shown in Figure 8. Specifically, timing register 1 provides preset period of time �� t, and wherein engine power enhanced feature is activated, and timing register 2 is followed in timing register 1, and to provide the forbidding period, wherein engine power enhanced feature is disabled. In the forbidding period that timing register 2 provides, engine power enhanced feature can not be activated, even if meeting power-lift condition, such as motor torque arrives restriction or speed at full capacity and decrease beyond triggering settings. Specifically, in fig. 8, sea line " Q_lim " represents the restriction of standard fuel emitted dose, and sea line " Q_lim " represents engine power and promotes the fuel injection amount after being triggered, and sea line " Boost " represents the restriction of the fuel injection amount that improve under engine power lifting state.Curve " situation 1 " represents fuel injection control situation when overcoming overload in preset period of time �� t, and curve " situation 2 " represents fuel injection control situation when not overcoming overload in preset period of time �� t. Such as, such as, according to the present invention, in the forbidding period, engine power enhanced feature can not be activated, no matter hydraulic pressure pressure drop does not still reach below triggering condition (situation 2) to lower than triggering condition (situation 1). After have passed through the forbidding period that timing register 2 provides, engine controller 30 will judge whether engine power enhanced feature should be re-enabled.

Utilize this forbidding period, it is possible to the deterioration of limiting engine weather resistance further.

Fig. 9 shows the schema that the engine power that can perform promotes flow process by previously described first and second enforcement modes.

In step S1, engine power promotes flow process and is activated.

Then, in step S2, engine controller judges whether engine power enhanced feature is access in (enabling). If result is "No", then flow process comes step S20 to keep engine power enhanced feature closedown (not enabling); And if result is "Yes", then flow process comes step S3.

In step S3, engine controller waits, wherein engine power enhanced feature is in and starts or prepare startup state.

Then, in step S4, engine controller judges that whether fuel injection amount is higher than a certain high per-cent (such as about 90%) of standard fuel emitted dose restriction (corresponding to model engine curve at full capacity), and whether the loss of the rotating speed of engine exceedes certain pre-set level (such as about 40rpm is to about 60rpm, such as 40rpm). If result is "No", then flow process returns step S3; And if result is "Yes", then flow process comes step S5.

In step S5, engine controller arranges a fuel injection amount restriction (the engine curve at full capacity corresponding to raising) raised.

Then, in step S6, engine controller judges that whether actual fuel injection quantities is lower than a certain high per-cent (such as about 70%) of the fuel injection amount restriction raised. If result is "Yes", then flow process returns step S3; And if result is "No", then flow process comes step S7.

In step S7, engine controller judges whether fuel injection amount limits (higher than its 100%) higher than standard fuel emitted dose. If result is "No", then flow process returns step S5; And if result is "Yes", then flow process comes step S8.

In step S8, enable by engine controller and/or keep engine power enhanced feature. Meanwhile, the counting of timing register 1 increases an increment.

Then, in step S9, engine controller judges whether the counting of timing register 1 is greater than a preset value. If result is "No", then flow process returns step S8, continues so that engine power promotes state; And if result is "Yes", then flow process comes step S10.

In step S10, engine power enhanced feature is disabled. Meanwhile, the counting of timing register 2 increases an increment.

Then, in step S11, engine controller judges whether the counting of timing register 2 is greater than a preset value. If result is "No", then flow process returns step S10, so that engine power promotes by lasting forbidding; And if result is "Yes", then flow process returns step S3.

Figure 10 shows and can perform by previously described first and second enforcement modes and promote the schema of hydraulic protecting flow process of flow process coordinated implementation with the engine power shown in Fig. 9.

In step S101, start hydraulic protecting flow process by hydrauliccontroller or engine controller.

Then, in step S102, hydrauliccontroller or engine controller judge whether the rotating speed loss of engine and/or torque exceed corresponding default maximum level. If result is "No", then flow process returns step S101; And if result is "Yes", then flow process comes step S103.

In step S103, the hydraulic pressure that hydrauliccontroller or engine controller reduce hydraulic efficiency system exports initiatively to reduce hydraulic pressure pressure.

According to the present invention; by arranging a preset period of time, engine power enhanced feature is activated during this period, and engine power enhanced feature terminates after this; can effectively low insured's engine not impaired during power-lift, and the decline of Engine Durability is limited.

In addition, directly following the forbidding period in preset period of time by arranging one, engine power enhanced feature is disabled wherein, and the decline of Engine Durability is additionally limited.

Furthermore, it may be desirable to utilize the hydraulic protecting function enabled can be combined with engine power enhanced feature, hydraulic efficiency system and engine can be protected to avoid under high capacity excessively impaired simultaneously.

Although it can be appreciated that describe the present invention with reference to excavator above, but the design of the present invention is also applicable to other various vehicle and equipment being equipped with oil engine.

Although it is also to be appreciated that describe hydraulic protecting function for protection excavator hydraulic system above, but similar protection function can be applied in vehicle and equipment by engine driven and bear the various functional components of load.

Although there has been described some particular implementation, but these enforcement modes only provide in an illustrative manner, and are not meant to and limit the scope of the invention. Claims and equivalent replacement thereof are intended to cover all amendment, replacement and changes dropped in the scope of the invention and purport.

Claims

1., for an engine power lifting system for explosive motor, comprising:

Device is surveyed in sense, and it is surveyed for feeling and expects by means of the load that engine overcomes during power operation; And

Engine controller, which is connected described engine and device is surveyed in sense, for receiving the load information from described sense survey device and control the operation of engine;

Wherein, described engine controller is configured to, when described load information indicates load to increase to above a load threshold, by the emitted dose that the restriction of the fuel injection amount of engine brings up to a rising from a standard emitted dose restriction is limited and starting engine power-lift, and terminate engine power promote by recovering the restriction of standard emitted dose after engine power lifting has been activated a preset period of time.

2. engine power lifting system as claimed in claim 1, wherein, described engine controller is configured to follow next-door neighbour forbid engine power lifting in a forbidding period of described preset period of time further.

3. engine power lifting system as claimed in claim 1 or 2, wherein, described engine controller is configured to monitor the Driving Torque of engine further, and when engine Driving Torque close to or be positioned at limit with standard emitted dose corresponding model engine at full capacity on curve time starting engine power-lift.

4. engine power lifting system as claimed any one in claims 1 to 3, wherein, described engine controller is configured to monitor the fuel injection amount of engine further, and when the fuel injection amount of engine is higher than starting engine power-lift during a fuel injection amount threshold value.

5. engine power lifting system as claimed in claim 4, wherein, described fuel injection amount threshold value is about 90% to about the 100% of standard emitted dose restriction.

6. engine power lifting system as according to any one of claim 1 to 5, wherein, described engine controller is configured to monitor the rotating speed of engine further, and when the rotating speed loss of engine is higher than starting engine power-lift during a rotating speed loss threshold value.

7. engine power lifting system as claimed in claim 6, wherein, described rotating speed loss threshold value is about 40rpm to about 60rpm.

8. engine power lifting system as according to any one of claim 1 to 7, also comprise functional component control device, it is integrated in or connects engine controller, for controlling functions parts, described functional component by engine driven to produce the operational power resisting described load;

Wherein, described functional component control device is formed at the operational power improving described functional component in described preset period of time.

9. engine power lifting system as claimed in claim 8, wherein, described functional component control device is configured to further, in described preset period of time when the rotating speed loss of engine and/or torque are higher than corresponding default maximum level, reduces the operational power of described functional component.

10. engine power lifting system as claimed in any one of claims 1-9 wherein, wherein, described engine is the engine of vehicle or equipment, the engine of such as Architectural Equipment.

11. 1 kinds of excavators, comprising:

Engine;

Hydraulic efficiency system driven by the engine; And

Engine power lifting system as according to any one of claim 1 to 7, for providing engine power enhanced feature to engine.

12. excavators as claimed in claim 11; wherein; described engine power lifting system also comprises hydraulic protecting module; it is formed at the hydrodynamicpressure that engine power promotes when being activated in raising hydraulic efficiency system, and when the rotating speed loss of engine and/or torque are higher than the hydrodynamicpressure reducing or discharging in hydraulic efficiency system during corresponding default maximum level in described preset period of time.

13. excavators as described in claim 11 or 12, wherein, described hydraulic protecting module is integrated in engine controller, or is formed as independent hydrauliccontroller and is connected between described engine controller and hydraulic efficiency system.

14. 1 kinds, for the engine power method for improving of explosive motor, comprising:

Sense is surveyed and is expected by the load that engine overcomes during power operation;

When load information indicates load to increase to above a load threshold, by the emitted dose that the restriction of the fuel injection amount of engine brings up to a rising from a standard emitted dose restriction is limited and starting engine power-lift; And

Terminate engine power promote by recovering the restriction of standard emitted dose after engine power lifting has been activated a preset period of time.

15. engine power method for improving as claimed in claim 14, also comprise:

Follow next-door neighbour and forbid engine power lifting in a forbidding period of described preset period of time.

The 16. engine power method for improving as described in claims 14 or 15, also comprise:

Described preset period of time improves the operational power of functional component, described functional component by engine driven to produce the operational power resisting described load.

17. engine power method for improving as claimed in claim 16, also comprise:

In described preset period of time when the rotating speed loss of engine and/or torque are higher than corresponding default maximum level, reduce the operational power of described functional component.