Working machine with stepless transmission with output controlled subject to engine load

FIELD: transport.

SUBSTANCE: invention relates to working machines with ICE engaged with stepless transmission. Working machine comprises ICE (1C) and stepless transmission (IVT) engaged therewith. At least, one sensor generates output signal representing ICE load in real time. At least, one data processing electric circuit serves to control transmission power subject to ICE threshold and real loads. In compliance with one version, at least, one data processing electric circuit includes ICE control unit (ECU) connected with ICE (1C), and transmission control UNIT (TCU) engaged with stepwise transmission (IVT). Engine control unit (ECU) feeds output signal to transmission control unit (TCU) that represents load in real time. Transmission control unit controls transmission power output subject to threshold load and real time load. Invention relates to method of operating said working machine.

EFFECT: ruled out ICE engine overload.

17 cl, 3 dwg

 

The technical field to which the invention relates

The present invention relates to work machines, and, in particular, to work the machines containing the internal combustion engine, paired with a continuously variable transmission.

The level of technology

A working machine, such as building a working machine, agricultural working machine or wood working machine, usually involves starting the engine in the form of an internal combustion engine (IC). The internal combustion engine (IC) can be either in the form of the engine with compression ignition (i.e. diesel engine or engine with forced ignition (i.e. gasoline engine). For the most part hard working machines starting the engine is a diesel engine that has the best characteristics gearing, voltage and torque for joint operations.

The actuation of the internal combustion engine at step load transient after shock is a feature that is most affected by the volume of the engine, metal products motor (for example, does the standard engine turbocharger, the turbocharger bypass valve or adjustable geometry, and so on) and software strategy for launching aerial and then the cast of actuators (for example, the exhaust gas recirculation, turbocharger with adjustable turbine geometry (VGT), the design of the fuel injector, etc.) subject to the requirements of the legislation on discharge into the environment (for example, visible smoke, nitrogen oxides (NOxand so on), noise or vibration. Shock may be the result of the load on the transmission (for example, trailed gun for machine) or an external load (for example, an auxiliary hydraulic load such as a front-end loader, attachments back shovels (excavators), etc)

Engine system generally respond in a linear manner during the transition mode when the application is not well-established load. First, the load applied to the shaft of the internal combustion engine IC. The speed of the internal combustion engine IC decreases when the load increases. The fall speed of the motor depends on whether the isochronous controller or a lower speed. Increases air flow to provide an internal combustion engine IC additional air, changing air actuators. The delay in time required to reach a checkpoint of the new air flow. The amount of fuel injection, which occurs almost immediately increased to account limit the opacity of the exhaust gases and Maxim is correctly acceptable quantity of fuel. The engine then returns to the control point speed of the engine. Indicators related to the response of the engine speed load during the transition mode after shock loads are drop speed and time to return to the reference point of the engine.

The internal combustion engine IC can be paired with a continuously variable transmission (IVT), which creates a continuous variable output speed from 0 to the maximum value in a smooth form. Continuously variable transmission IVT usually contains hydrostatic components and mechanical gears. Hydrostatic components translate the power shaft rotation in hydraulic flow, and Vice versa. The flow of power through a continuously variable transmission IVT can only be through the hydrostatic units, only through the mechanical components or only through a combination of those and others depending on the design and speed of output.

Working the machine containing the internal combustion engine IC, paired with a continuously variable transmission IVT, can identify problems that can be overcome in two ways: first, a sudden load is applied to the towed or hydraulic functions of the machine, causing a decrease in motor speed. The response is to change the gear ratio continuously variable box is heredoc IVT to reduce the already reduced engine load, is slower than is necessary to prevent a significant drop in motor speed and sometimes loss of speed. Second, when an external load is applied to the internal combustion engine IC, such as during filling of the bucket front-end loader on a machine with a continuously variable transmission IVT, the driver can control the speed of the machine to a much greater extent than is possible with the internal combustion engine IC. Under these conditions, the output torque continuously variable transmission IVT and speed can lead to probuksovyvanija wheels and other undesirable characteristics. Similarly, if the external load from the other external action, such as a hydraulic effect, transferred to the gearbox, the external load in conjunction with bandwidth transmission can cause the engine to the overload condition.

In the art the necessary working machine and the appropriate way to regulate the capacity of the continuously variable transmission IVT thus, to avoid the overrun mode of the internal combustion engine IC.

Disclosure of invention

The invention in one form, relates to a working machine including an internal combustion engine IC and a continuously variable transmission IVT, coupled with the internal engine is gorania IC. At least one sensor delivers an output signal representing the value of the load in real time on the internal combustion engine IC. At least made one electrical circuit data for power control in a continuously variable transmission IVT, depending on the threshold load of the internal combustion engine IC and load values in real time for internal combustion engine IC.

In another form, the invention relates to a method of operation of the working machine, comprising an internal combustion engine IC, paired with a continuously variable transmission IVT. This method includes the steps of: establishing a threshold load, corresponding to the maximum permitted load on the internal combustion engine IC; determining the value of the load in real-time associated with the internal combustion engine IC; comparing the value of the load in real time with a threshold value of the load; and a power control continuously variable transmission IVT, depending on the phase comparison.

Brief description of drawings

Figure 1 - schematic representation of a variant of implementation of the working machine according to the present invention; and

Figa and 2B is a block diagram of a variant of the method of working machine according to the present invention.

Detailed description of the invention

According to figure 1 shows a schematic representation of a variant of implementation of the working machine 10 according to the present invention. It is assumed that the working machine 10 is building a working machine, such as a front-end loader company John Deere, but the working machine may be another view of the working machine, such as agricultural, forestry, mining or industrial working machine.

The working machine 10 includes an internal combustion engine 12, which is paired with a continuously variable transmission 14, typically via the output crankshaft 16 of the internal combustion engine 12. It is assumed that the internal combustion engine 12 is a diesel engine shown in the embodiment of the invention, but they can also be carbureted engine, propane engine, etc. of the internal combustion Engine 12 has a size and design according to the description.

Continuously variable transmission 14 can be made to the design, and therefore not described in detail here. Continuously variable transmission 14 has an output that is connected to at least one other lower trailer constituent element 18, which, in turn, is connected with a lot of drive wheels 20, one of which is shown in figure 1. Of course, you must understand the , in the case of the working machine, crawler type, trailer composite element 18 may be connected to the caterpillar.

Continuously variable transmission 14 also supplies the output power to one or more external loads 22, which, in turn, thus, provide an additional load on the internal combustion engine 12. External load 22 usually appear in the form of hydraulic loads, such as front loader, a boom of an excavator, unloading grain auger, motor saws for felling trees, etc. Full load on the internal combustion engine 12, thus, is a function and traction loads, and external hydraulic loads.

Block 24 engine control (ECU) electronically controls the operation of the internal combustion engine 12 and is connected to multiple sensors (not specifically shown)associated with the operation of the internal combustion engine 12. For example, the block 24 engine control (ECU) may be connected to the sensor, showing the control parameters of the engine such as the air flow speed within one or more inlet pipes, engine speed, fuel consumption, and/or adjustment of the ignition timing in the engine, the rate of recirculation of exhaust gases (ERG), the position of the blades of the turbocharger, etc. in Addition, the unit 24 controls the engine in which it can receive output signals from the unit 28 of the control of the machine, representing the control settings of the machine entered by the driver, such as adjustable ground speed (as indicated by the position of the shift lever of the transmission control lever throttle and/or hydrostatic lever or adjustable direction of the working machine 10 (a specified angular direction of the steering wheel).

Similarly, the unit 26 controls the transmission (TCU) electronically controls the operation of a continuously variable transmission IVT 14 and is connected to multiple sensors associated with the work of the continuously variable transmission IVT 14. Block 24 of the engine management ECU and the unit 26 controls the transmission TCU coupled together via a bus structure that provides two-way data flow, such as bus 30 site network adapter (CAN).

Although various electronic components, such as block 24 engine control ECU, the unit 26 controls the transmission TCU and the block 28 of the machine control VCU shown coupled together using a wire connection, it should also be understood that wireless connections can be used for some applications.

According figa and 2B, a variant of the method of operation of the working machine 10 according to the present invention will be described in more detail. In block 40 is set to user defined value clause is horn load, such as those introduced through the patch panel is connected to the control unit of the machine VCU 28, and stored in memory.

One possibility of setting the threshold load is to match the load with the maximum value of torque/load torque curve for a given internal combustion engine. For example, for a given internal combustion engine is customary to use a predefined torque curve torque (load), which is a function of motor speed. The curve of the torque can be stored in memory or dynamically determined using a predetermined mathematical function. Such torque curves are well known in the art and therefore not shown in this description for purposes of brevity. The curve of torque used in the work, determines the maximum output torque for a given motor speed. Thus, it is possible the number of maximum output torque, each corresponding to a different operating speed of the internal combustion engine 12. Torque or load is the rotational force of the crankshaft of the engine, i.e. the output power. The motor speed is usually determined position of the throttle either electronic or mechanism is achieved. For the corresponding torque of the engine block 24 engine control (ECU) controls the operation of one or more control parameters of the engine to achieve the desired output torque, which corresponds to or less than the maximum torque of the working speed. For example, the block 24 engine control (ECU) controls the exhaust gas recirculation (ERG), adjustable in ERG system (as well as the ratio of dilution with air), a controlled element in the turbocharger variable geometry (VGT), the time of fuel injection and/or fuel pressure. Thus, it is possible to set the threshold value of the load matches the value of the maximum load torque curve at a given operating speed, or a decimal degree value for the maximum load.

In block 42 the decision established a number of criteria for determining whether or not going to be demoted torque continuously variable transmission IVT 14. First, if the value of the load in real time on the internal combustion engine is greater than the maximum load entered in block 40, then there is an indication that the output torque continuously variable transmission IVT 14 must be reduced. The value of the load in real time can be considered one of th the but or displayed using a number of techniques, such as reading speed of flow of the fuel in real time in the internal combustion engine 12. Other factors taken into account in the decision-making 42 are technical requirements gear, technical specifications machine speed and a variety of other technical requirements.

If in block 42 decision-making the decision to activate the lowering torque (line 44), then just activate the lowering torque (block 46). On the other hand, if the decrease in torque is not activated (line 48), the decision to deactivate the function of lowering the torque (block 50 decision). In other words, even if you decide not to activate the decrease of torque in block 42 decision-making, reduction of torque may actually be already in an activated state from the preceding logic circuit. Block 50 decision again checks the operating parameters, including technical requirements gear, technical specifications machine speed and a variety of other technical requirements for determining whether to deactivate the decrease torque. If so, then the reduction of torque just deactivate (block 52), in other words, control passes along line 54.

In the block 55 decision making checks, whether the decrease in torque is activated or deactivated. If the decrease in torque is deactivated (line 56), then the continuously variable transmission 14 is not beyond face value, and 100% tractive effort applied to the output of the continuously variable transmission 14 (block 57). On the other hand, if the lower torque (line 58), then the conversion factor of lowering the torque is calculated based on the difference between the value of the load in real time and the threshold value of the load (blocks 60 and 62). Any user-defined limits on the conversion factor of lowering the torque taken into account in block 64, the data of the feedback circuit, respectively, are adjusted in block 66, and the logic ends in a block 68 by a conversion factor of lowering the torque.

Having described preferred embodiments of the invention, it is obvious that various changes may be made without leaving the scope of invention, which is defined by the attached claims.

1. Working machine, comprising:
the internal combustion engine (IC);
continuously variable transmission (IVT)coupled with the internal combustion engine (IC);
at least one sensor producing an output signal representing the value of the load in real the om time on the specified internal combustion engine (IC); and
at least one electrical circuit data for power control infinitely variable transmission (IVT), depending on the threshold load for the specified internal combustion engine IC and the specified load values in real-time for the specified internal combustion engine IC.

2. The working machine according to claim 1, in which indicated at least one electrical circuit for processing data contains the engine control unit (ECU)connected to the specified internal combustion engine IC, and the control unit transmission (TCU), coupled with the above continuously variable transmission IVT, the specified engine control unit (ECU) delivers an output signal to the control unit gearbox TCU, representing the value of the load in real time, the specified control unit transmission (TCU) controls the specified capacity of the continuously variable transmission IVT, depending on the result of comparison of the specified values threshold load and the specified load values in real time.

3. The working machine according to claim 2, in which the specified control unit gearbox TCU additionally controls the capacity of the continuously variable transmission IVT, depending on variable ground speed of the working machine, and an adjustable direction of the working machine.

4. The working machine according to claim 2, in which the specified control unit gearbox TCU determines the torque control stepless transmission IVT to control the specified capacity specified stepless transmission IVT.

5. The working machine according to claim 2, in which the specified engine control unit (ECU) associated with the specified control unit gearbox TCU through the bus area network adapter (CAN).

6. The working machine according to claim 1, in which the specified threshold value of the load corresponds to the maximum permitted load of the specified internal combustion engine IC for the given operating conditions specified internal combustion engine IC, the specified value is the maximum permitted load includes both the drive load, and at least one external load to the specified internal combustion engine IC.

7. The working machine according to claim 6, in which the specified value is the maximum permitted load is associated with a maximum torque at a given operating speed for the specified internal combustion engine IC.

8. The working machine according to claim 6, in which the at least one external load includes at least one hydraulic load applied to the specified internal combustion engine IC.

9. The working machine according to claim 1, in which ananny, at least one sensor reads at least one feed rate of fuel specified internal combustion engine IC, the load factor of the internal combustion engine IC and the percentage of torque to the specified internal combustion engine IC.

10. The working machine according to claim 1, in which the working machine is one of the following: building a working machine, agricultural machine, wood machine, mining machine and industrial machine.

11. The method of controlling a working machine that contains an internal combustion engine IC, paired with a continuously variable transmission IVT, containing the following steps:
setting the threshold load corresponding to the maximum permitted load on the internal combustion engine IC;
determine the value of the load in real-time associated with the internal combustion engine IC;
comparison of the specified load in real-time with the specified threshold value of the load; and
capacity management continuously variable transmission IVT, depending on the specified phase comparison.

12. The method of controlling a working machine according to claim 11, wherein said at least one electrical circuit data includes the engine control unit (ECU)associated with the specified internal combustion engine IC, iblock control gearbox TCU, associated with the specified stepless transmission IVT, and includes the following stages:
the production of the output signal from the engine control unit (ECU) to the specified control unit gearbox TCU representing the specified load value in real time; and
control to the specified capacity of the specified stepless transmission IVT using the specified control unit gearbox TCU, depending on the specified phase comparison.

13. The method of controlling a working machine according to claim 11, wherein said control unit gearbox TCU controls the specified power signal specified stepless transmission IVT, depending on variable ground speed of the working machine and the regulated direction of the working machine.

14. The method of controlling a working machine according to claim 11, in which the specified threshold value of the load corresponds to the maximum permitted load on the internal combustion engine IC for the given operating conditions on the internal combustion engine IC specified maximum permitted load includes a drive load, and at least the external load on the internal combustion engine IC.

15. The method of controlling a working machine according to claim 11, in which the specified threshold value of the load associated with distorting the th torque of the internal combustion engine IC.

16. The method of controlling a working machine according to claim 11, in which indicated at least one external load includes at least one hydraulic load applied to the internal combustion engine IC.

17. The method of controlling a working machine according to claim 11, wherein said step of determining the specified load values in real-time includes reading at least one feed rate of fuel to the internal combustion engine IC, the load factor of the internal combustion engine IC and the percentage of torque to the specified internal combustion engine IC.



 

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