Anti-speed-down control method for excavator and related device

Abstract

The invention discloses an anti-speed-down control method for an excavator and a related device. After the excavator is started, the starting working condition of the excavator can be determined based on the water temperature and the hydraulic oil temperature of the excavator; if the starting working condition of the excavator is cold starting, hydraulic preloading, engine rotating speed increasing, engine lambda correction, exhaust gas recirculation valve closing, after-injection opening and hydraulic loading ramp are carried out when the excavator is operated, so that the anti-load capacity of the engine is improved, and the speed reduction is reduced; and if the starting working condition of the excavator is hot starting, the hydraulic power loading ramp and the engine lambda are adjusted and the exhaust gas recirculation valve is closed when the excavator is operated for the first time, so that the anti-load capacity of the engine is improved, and the speed reduction is reduced. No hardware is added, cold start and hot start are identified and distinguished based on parameters of the excavator, then different control strategies are adopted to reduce speed reduction of the excavator, power of the excavator is ensured, the effect is remarkable, and hardware cost does not need to be increased.

Description

Technical Field

[0001] The present invention relates to the field of excavators, and in particular to an excavator anti-speed drop control method and a related device. Background Art

[0002] The working conditions of excavators are complex and diverse. The speed drop level is related to the performance of the selected engine, the working environment, and the working conditions. A good excavator should ensure a good speed drop level under all working conditions. Therefore, how to ensure the power of the excavator when it is operated for the first time after starting has become a technical problem that needs to be solved urgently by people in this field. Summary of the invention

[0003] In view of the above problems, the present invention provides an excavator anti-speed drop control method and related devices that overcome the above problems or at least partially solve the above problems.

[0004] In a first aspect, a method for preventing speed drop of an excavator is provided, comprising:

[0005] After the excavator is started, determining the starting working condition of the excavator based on the water temperature and the hydraulic oil temperature of the excavator;

[0006] If the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation to improve the engine load resistance and reduce speed drop;

[0007] If the starting condition of the excavator is: hot start, the excavator adjusts the hydraulic power loading ramp, engine lamda correction and closes the exhaust gas recirculation valve during the first operation to improve the engine's load resistance and reduce the speed drop.

[0008] Optionally, in some optional embodiments, after the excavator is started, the starting working condition of the excavator is determined based on the water temperature and the hydraulic oil temperature of the excavator, including:

[0009] After the excavator is started, if the water temperature of the excavator is not greater than the first preset water temperature and the hydraulic oil temperature of the excavator is not greater than the first preset oil temperature, then the starting condition of the excavator is determined to be: cold start;

[0010] If the water temperature of the excavator is greater than the first preset water temperature and not greater than the second preset water temperature, and the hydraulic oil temperature of the excavator is greater than the first preset oil temperature and not greater than the second preset oil temperature, the starting condition of the excavator is determined to be: hot start.

[0011] Optionally, in some optional embodiments, if the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation to improve the engine load resistance and reduce speed drop, including:

[0012] If the starting condition of the excavator is: cold start, the bucket confluence valve is controlled to be closed during operation of the excavator to allow the pressure at the hydraulic pump end to overflow and increase the engine load;

[0013] Control the exhaust gas recirculation valve and intake throttle valve to close;

[0014] Switch to normal operating mode;

[0015] Turn on post-injection to increase combustion temperature and intake air level;

[0016] Adjust the hydraulic power loading ramp value according to the current hydraulic oil temperature;

[0017] The rotation speed of the excavator is increased to a preset rotation speed, and the lamda coefficient is adjusted to 1.

[0018] Optionally, in some optional embodiments, if the starting condition of the excavator is: hot start, the excavator adjusts the hydraulic power loading ramp, engine lamda correction and closes the exhaust gas recirculation valve during the first operation to improve the engine load resistance and reduce the speed drop, including:

[0019] If the starting condition of the excavator is: hot start, the excavator adjusts the hydraulic power loading ramp value during the first operation;

[0020] Close the exhaust gas recirculation valve and adjust the current lamda coefficient to 1.

[0021] In a second aspect, an anti-speed drop control device for an excavator includes: a working condition judgment unit, a cold start unit, and a hot start unit;

[0022] The working condition judgment unit is used to determine the starting working condition of the excavator based on the water temperature and hydraulic oil temperature of the excavator after the excavator is started;

[0023] The cold start unit is used for, if the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation, so as to improve the engine load resistance and reduce the speed drop;

[0024] The hot start unit is used to adjust the hydraulic power loading ramp, engine lamda correction and close the exhaust gas recirculation valve during the first operation of the excavator if the starting condition of the excavator is: hot start, so as to improve the engine's load resistance and reduce speed drop.

[0025] Optionally, in certain optional embodiments, the operating condition judgment unit includes: a cold start operating condition subunit and a hot start operating condition subunit;

[0026] The cold start working condition subunit is used to determine the starting working condition of the excavator as cold start after the excavator is started, if the water temperature of the excavator is not greater than a first preset water temperature and the hydraulic oil temperature of the excavator is not greater than a first preset oil temperature;

[0027] The hot start condition subunit is used to determine that the starting condition of the excavator is hot start if the water temperature of the excavator is greater than the first preset water temperature and not greater than the second preset water temperature, and the hydraulic oil temperature of the excavator is greater than the first preset oil temperature and not greater than the second preset oil temperature.

[0028] Optionally, in certain optional embodiments, the cold start unit comprises: a confluence valve closing subunit, a circulation valve closing subunit, a mode switching subunit, a post-spray opening subunit, a first ramp adjustment subunit and a first lamda adjustment subunit;

[0029] The confluence valve closing subunit is used to control the bucket confluence valve to close when the excavator is in operation if the starting condition of the excavator is: cold start, so as to overflow the pressure at the hydraulic pump end and increase the engine load;

[0030] The circulation valve closing subunit is used to control the closing of the exhaust gas recirculation valve and the intake throttle valve;

[0031] The mode switching subunit is used to switch to a normal operating mode;

[0032] The post-injection opening subunit is used to open the post-injection to increase the combustion temperature and the intake level;

[0033] The first ramp adjustment subunit is used to adjust the hydraulic power loading ramp value according to the current hydraulic oil temperature;

[0034] The first lamda adjustment subunit is used to increase the rotation speed of the excavator to a preset rotation speed and adjust the lamda coefficient to 1.

[0035] Optionally, in certain optional embodiments, the hot start unit comprises: a second ramp adjustment subunit and a second lamda adjustment subunit;

[0036] The second ramp adjustment subunit is used to adjust the hydraulic power loading ramp value of the excavator during the first operation if the starting condition of the excavator is: hot start;

[0037] The second lamda adjustment subunit is used to close the exhaust gas recirculation valve and adjust the current lamda coefficient to 1.

[0038] In a third aspect, a computer-readable storage medium stores a program, and when the program is executed by a processor, the excavator anti-speed drop control method described in any one of the above items is implemented.

[0039] In a fourth aspect, an electronic device comprises at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other via the bus; and the processor is used to call program instructions in the memory to execute any one of the above-mentioned excavator anti-speed drop control methods.

[0040] By means of the above technical scheme, the present invention provides an excavator anti-speed drop control method and related device, which can determine the starting condition of the excavator based on the water temperature and hydraulic oil temperature of the excavator after the excavator is started; if the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closure, post-injection and hydraulic loading ramp during operation to improve the engine load resistance and reduce the speed drop; if the starting condition of the excavator is: hot start, the excavator adjusts the hydraulic power loading ramp, engine lamda correction and exhaust gas recirculation valve closure during the first operation to improve the engine load resistance and reduce the speed drop. It can be seen from this that the present invention can identify based on the parameters of the excavator without adding any hardware, distinguish between cold start and hot start, and then adopt different control strategies to reduce the speed drop of the excavator and ensure the power of the excavator, with significant effects and without increasing hardware costs.

[0041] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0043] Figure 1 A flow chart of an excavator speed reduction prevention control method provided by the present invention is shown;

[0044] Figure 2 A schematic diagram of a first cold start control program provided by the present invention is shown;

[0045] Figure 3 A schematic diagram of a second cold start control program provided by the present invention is shown;

[0046] Figure 4 A schematic diagram of a third cold start control program provided by the present invention is shown;

[0047] Figure 5 A schematic diagram of a first hot start control program provided by the present invention is shown;

[0048] Figure 6 A schematic diagram of a second hot start control program provided by the present invention is shown;

[0049] Figure 7 A third hot start control program schematic diagram provided by the present invention is shown;

[0050] Figure 8 A schematic structural diagram of an anti-speed drop control device for an excavator provided by the present invention is shown;

[0051] Fig. 9 A structural schematic diagram of an electronic device provided by the present invention is shown. DETAILED DESCRIPTION

[0052] The exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present invention and to enable the scope of the present invention to be fully communicated to those skilled in the art.

[0053] like Figure 1 As shown, the present invention provides an excavator anti-speed drop control method, including: S100, S200 and S300;

[0054] S100, after the excavator is started, determining the starting working condition of the excavator based on the water temperature and the hydraulic oil temperature of the excavator;

[0055] Optionally, after the excavator is started, the first operation of the machine is divided into: the first operation of the machine after a cold start and the first operation of the machine after a hot start. The first operation of the machine after a cold start is due to the low temperature of the combustion chamber after the cold start, the poor fuel atomization effect, the poor performance of the supercharger, etc., and the operation of the machine at this time (heavy load) causes a large speed drop due to poor combustion and less fuel injection. The first operation of the machine after a hot start is due to the low speed after startup (generally idling after startup), low load and low exhaust temperature, and poor supercharger capacity. At this time, the fuel injection is limited due to the small and slow air intake, resulting in a large speed drop. Therefore, the present invention can identify the starting conditions of the excavator after the excavator is started, so that different anti-speed drop controls can be performed on the excavator based on different starting conditions when operating the machine, thereby improving the anti-speed drop effect, and the present invention does not limit this.

[0056] Optionally, the water temperature of the excavator can be acquired based on the existing water temperature monitoring system of the excavator, and the hydraulic oil temperature can be acquired based on the existing hydraulic oil temperature monitoring system of the excavator. The present invention does not need to add additional hardware for acquiring the water temperature and the hydraulic oil temperature. Of course, for excavators that are not equipped with a water temperature monitoring system and a hydraulic oil temperature monitoring system at the factory, the present invention can set a corresponding sensor system for acquiring the water temperature and the hydraulic oil temperature, and the present invention does not limit this.

[0057] Optionally, the present invention can set different water temperature thresholds and hydraulic oil temperature thresholds according to actual needs, which are used for comparison with the collected water temperature and hydraulic oil temperature, and further determine the starting condition of the excavator based on the comparison results. The present invention does not impose any limitation on this.

[0058] For example, in some optional embodiments, the S100 includes: step 1.1 and step 1.2;

[0059] Step 1.2, after the excavator is started, if the water temperature of the excavator is not greater than the first preset water temperature and the hydraulic oil temperature of the excavator is not greater than the first preset oil temperature, then determining that the starting condition of the excavator is: cold start;

[0060] Optionally, the present invention can set specific values ​​of the first preset water temperature and the first preset oil temperature according to actual needs. For example, the present invention can set the first preset water temperature to 60 degrees Celsius and the first preset oil temperature to 15 degrees Celsius. When the water temperature is less than or equal to 60 degrees Celsius and the hydraulic oil temperature is less than or equal to 15 degrees Celsius, the starting condition of the excavator is determined to be: cold start, and the present invention does not limit this.

[0061] Step 1.2: If the water temperature of the excavator is greater than the first preset water temperature and not greater than the second preset water temperature, and the hydraulic oil temperature of the excavator is greater than the first preset oil temperature and not greater than the second preset oil temperature, determine that the starting condition of the excavator is: hot start.

[0062] Optionally, the present invention can set specific values ​​of the second preset water temperature and the second preset oil temperature according to actual needs. For example, the present invention can set the second preset water temperature to 80 degrees Celsius and the first preset oil temperature to 30 degrees Celsius. When the water temperature is in the range of 60 degrees Celsius to 80 degrees Celsius and the hydraulic oil temperature is in the range of 15 degrees Celsius to 30 degrees Celsius, the starting condition of the excavator is determined to be: hot start, and the present invention does not limit this.

[0063] S200, if the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation to improve the engine load resistance and reduce speed drop;

[0064] For example, in some optional embodiments, the S200 includes: step 2.1, step 2.2, step 2.3, step 2.4, step 2.5 and step 2.6;

[0065] Step 2.1, if the starting condition of the excavator is: cold start, when the excavator is in operation, the bucket confluence valve is controlled to be closed to allow the pressure at the hydraulic pump end to overflow and increase the engine load;

[0066] Step 2.2, controlling the exhaust gas recirculation valve and the intake throttle valve to close;

[0067] Step 2.3, switch to normal operation mode;

[0068] Step 2.4: Turn on the post-injection to increase the combustion temperature and intake level;

[0069] Step 2.5: Adjust the hydraulic power loading ramp value according to the current hydraulic oil temperature;

[0070] Step 2.6: Increase the speed of the excavator to a preset speed, and adjust the lamda coefficient to 1.

[0071] Optionally, when the excavator enters a cold start condition, the present invention can determine whether the excavator has been operated and whether it is the first operation based on the pilot signal, and the present invention does not impose any limitation on this.

[0072] Optionally, the confluence valve is also called a Bypass valve. When the engine controller ECU closes the confluence valve, the hydraulic oil can flow through the valve to the oil cylinder, causing the pressure at the hydraulic pump end to overflow. The present invention does not impose any limitation on this.

[0073] Optionally, the engine controller ECU can increase the engine load to achieve a rapid heat-up effect. The magnitude of the preload amplitude can be determined through a large number of tests, and the present invention does not impose any limitation on this.

[0074] Optionally, the engine controller ECU can also close the exhaust gas recirculation valve (also called EGR valve) and the intake throttle valve (also called intake throttle valve). The exhaust gas recirculation valve and the intake throttle valve are both well-known technical concepts in the field. The present invention will not describe them in detail. Please refer to the relevant descriptions in the field for details.

[0075] Optionally, the engine controller ECU can also control the opening of the post-injection. Post-injection is a well-known technical concept in the art, and the present invention will not describe it in detail. For details, please refer to the relevant description in the art.

[0076] For example, in a normal engine combustion, the injector has pre-injection, main injection and post-injection. Post-injection refers to the injection within the angle after the piston reaches the top dead center. These fuels will not participate in the combustion work, and most of them will be discharged into the exhaust pipe through the exhaust gas circulation. In this way, the temperature in the exhaust pipe will increase, and the responsiveness of the supercharger can be improved, so that the boost pressure will be increased.

[0077] Optionally, the hydraulic system controller TCU can adjust the hydraulic power loading ramp value according to the oil temperature (there is a special correction formula based on the oil temperature under cold start conditions). The hydraulic power loading ramp value represents the rate at which the hydraulic pump loads when the excavator is in action. The larger the ramp value, the slower the loading rate. The determination of this value can be obtained by conducting a large number of experiments, and the present invention does not limit this.

[0078] Optionally, the engine controller ECU can increase the current engine speed by 100rpm, and automatically adjust the current lamda coefficient to 1. The lamda coefficient represents the amount of fuel injection when the engine is loaded. The lamda value is usually greater than 1. The smaller the value, the more fuel injection is allowed. The smaller the Lamda value, the more fuel is injected and the greater the smoke density. It should be noted that a lamda coefficient of 1 is much smaller than the lamda during normal operation. Experiments have shown that a fuel injection amount with a lamda coefficient of 1 is sufficient. If it is smaller, even if more fuel is injected, the combustion will not be good, because there is only so much gas, and the oil-gas mixture requires a suitable ratio. The present invention does not limit this.

[0079] Optionally, in a cold start condition, as long as the machine is operated, the present invention can automatically correct the above parameters, regardless of whether it is the first time to operate the machine, to reduce the speed drop in the cold condition. Figure 2 As shown, the present invention is not limited to this.

[0080] Optionally, the overall control process of the hydraulic system controller TCU is as follows Figure 3 As shown, the overall control process of the engine controller ECU is as follows Figure 4 As shown, the present invention will not go into detail about this.

[0081] Optionally, under cold start conditions, when the driver does not operate (corresponding to the pilot system pressure of 0) or the engine and hydraulic temperature rises (for example, greater than 30 degrees Celsius), the engine speed, hydraulic power loading ramp value, and lamda system automatically return to normal. The present invention does not impose any restrictions on this.

[0082] S300: If the starting condition of the excavator is hot start, the excavator adjusts the hydraulic power loading ramp, the engine lamda correction and closes the exhaust gas recirculation valve during the first operation to improve the engine load resistance and reduce the speed drop.

[0083] For example, in some optional embodiments, the S300 includes: step 3.1 and step 3.2;

[0084] Step 3.1: If the starting condition of the excavator is hot start, the excavator adjusts the hydraulic power loading ramp value during the first operation;

[0085] Step 3.2: Close the exhaust gas recirculation valve and adjust the current lamda coefficient to 1.

[0086] Optionally, after a successful hot start, when the driver operates the machine, the hydraulic system controller TCU may automatically adjust the hydraulic power loading ramp value (which may be a fixed correction value under hot start conditions), and the present invention does not impose any limitation on this.

[0087] Optionally, under hot start conditions, the engine controller ECU can automatically close the EGR valve and automatically adjust the current lamda coefficient to 1, and the present invention does not impose any limitation on this.

[0088] Optionally, under hot start conditions, when the first operation is completed and the operation continues, the special RS trigger mechanism will restore the engine and hydraulic control parameters to normal, avoiding controllability and responsiveness problems caused by special parameters. RS trigger mechanism: When the S input is 1 and the R input is 0, the output Q=1, Q-=0. When the machine is operated for the first time, after the above S input conditions are met, the output Q=1, when the operation is completed, the S input becomes 0, R becomes 1, and Q becomes 0. When Q- becomes 1, R is always equal to 1. When the machine is operated again, even if S is equal to 1, since R=1, the output Q is always 0.

[0089] Optionally, after hot starting, only when the machine is operated for the first time, the present invention will optimize the parameters in a targeted manner to reduce the loss, and the present invention does not impose any limitation on this.

[0090] Optionally, the overall control strategy under hot start conditions is as follows Figure 5 As shown, the overall control process of the hydraulic system controller TCU is as follows Figure 6 As shown, the overall control process of the engine controller ECU is as follows Figure 7 As shown, the present invention will not go into detail about this.

[0091] like Figure 8 As shown, the present invention provides an anti-speed drop control device for an excavator, comprising: a working condition judgment unit 100, a cold start unit 200 and a hot start unit 300;

[0092] The working condition judgment unit 100 is used to determine the starting working condition of the excavator based on the water temperature and hydraulic oil temperature of the excavator after the excavator is started;

[0093] The cold start unit 200 is used for, if the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation, so as to improve the engine load resistance and reduce the speed drop;

[0094] The hot start unit 300 is used to adjust the hydraulic power loading ramp, engine lamda correction and close the exhaust gas recirculation valve during the first operation of the excavator if the starting condition of the excavator is: hot start, so as to improve the engine's load resistance and reduce speed drop.

[0095] Optionally, in some optional embodiments, the operating condition judgment unit 100 includes: a cold start operating condition subunit and a hot start operating condition subunit;

[0096] The cold start working condition subunit is used to determine the starting working condition of the excavator as cold start after the excavator is started, if the water temperature of the excavator is not greater than a first preset water temperature and the hydraulic oil temperature of the excavator is not greater than a first preset oil temperature;

[0097] The hot start condition subunit is used to determine that the starting condition of the excavator is hot start if the water temperature of the excavator is greater than the first preset water temperature and not greater than the second preset water temperature, and the hydraulic oil temperature of the excavator is greater than the first preset oil temperature and not greater than the second preset oil temperature.

[0098] Optionally, in certain optional embodiments, the cold start unit 200 includes: a confluence valve closing subunit, a circulation valve closing subunit, a mode switching subunit, a post-spray opening subunit, a first ramp adjustment subunit, and a first lamda adjustment subunit;

[0099] The confluence valve closing subunit is used to control the bucket confluence valve to close when the excavator is in operation if the starting condition of the excavator is: cold start, so as to overflow the pressure at the hydraulic pump end and increase the engine load;

[0100] The circulation valve closing subunit is used to control the closing of the exhaust gas recirculation valve and the intake throttle valve;

[0101] The mode switching subunit is used to switch to a normal operating mode;

[0102] The post-injection opening subunit is used to open the post-injection to increase the combustion temperature and the intake level;

[0103] The first ramp adjustment subunit is used to adjust the hydraulic power loading ramp value according to the current hydraulic oil temperature;

[0104] The first lamda adjustment subunit is used to increase the rotation speed of the excavator to a preset rotation speed and adjust the lamda coefficient to 1.

[0105] Optionally, in some optional embodiments, the hot start unit 300 includes: a second ramp adjustment subunit and a second lamda adjustment subunit;

[0106] The second ramp adjustment subunit is used to adjust the hydraulic power loading ramp value of the excavator during the first operation if the starting condition of the excavator is: hot start;

[0107] The second lamda adjustment subunit is used to close the exhaust gas recirculation valve and adjust the current lamda coefficient to 1.

[0108] The present invention provides a computer-readable storage medium on which a program is stored. When the program is executed by a processor, the excavator anti-speed drop control method described in any one of the above items is implemented.

[0109] like Fig. 9 As shown, the present invention provides an electronic device 70, which includes at least one processor 701, and at least one memory 702 and a bus 703 connected to the processor 701; wherein the processor 701 and the memory 702 communicate with each other through the bus 703; the processor 701 is used to call the program instructions in the memory 702 to execute any of the above-mentioned excavator anti-speed loss control methods.

[0110] In the present invention, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0111] Each embodiment in this specification is described in a related manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0112] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined in the present invention may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown in the present invention, but will conform to the widest scope consistent with the principles and novel features disclosed in the present invention.

[0113] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for preventing speed drop of an excavator, characterized in that: include: After the excavator is started, determining the starting working condition of the excavator based on the water temperature and the hydraulic oil temperature of the excavator; If the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation to improve the engine load resistance and reduce speed drop; If the starting condition of the excavator is: hot start, the excavator adjusts the hydraulic power loading ramp, engine lamda correction and closes the exhaust gas recirculation valve during the first operation to improve the engine's load resistance and reduce the speed drop.

2. The method according to claim 1, characterized in that After the excavator is started, the starting working condition of the excavator is determined based on the water temperature and the hydraulic oil temperature of the excavator, including: After the excavator is started, if the water temperature of the excavator is not greater than the first preset water temperature and the hydraulic oil temperature of the excavator is not greater than the first preset oil temperature, then the starting condition of the excavator is determined to be: cold start; If the water temperature of the excavator is greater than the first preset water temperature and not greater than the second preset water temperature, and the hydraulic oil temperature of the excavator is greater than the first preset oil temperature and not greater than the second preset oil temperature, the starting condition of the excavator is determined to be: hot start.

3. The method according to claim 1, characterized in that If the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation to improve the engine load resistance and reduce speed drop, including: If the starting condition of the excavator is: cold start, the bucket confluence valve is controlled to be closed during operation of the excavator to allow the pressure at the hydraulic pump end to overflow and increase the engine load; Control the exhaust gas recirculation valve and intake throttle valve to close; Switch to normal operating mode; Turn on post-injection to increase combustion temperature and intake air level; Adjust the hydraulic power loading ramp value according to the current hydraulic oil temperature; The rotation speed of the excavator is increased to a preset rotation speed, and the lamda coefficient is adjusted to 1.

4. The method according to claim 1, characterized in that: If the starting condition of the excavator is hot start, the excavator adjusts the hydraulic power loading ramp, the engine lamda correction and closes the exhaust gas recirculation valve during the first operation to improve the engine load resistance and reduce the speed drop, including: If the starting condition of the excavator is: hot start, the excavator adjusts the hydraulic power loading ramp value during the first operation; Close the exhaust gas recirculation valve and adjust the current lamda coefficient to 1.

5. An anti-speed drop control device for an excavator, characterized in that: include: Working condition judgment unit, cold start unit and hot start unit; The working condition judgment unit is used to determine the starting working condition of the excavator based on the water temperature and hydraulic oil temperature of the excavator after the excavator is started; The cold start unit is used for, if the starting condition of the excavator is: cold start, the excavator performs hydraulic preloading, engine speed increase, engine lamda correction, exhaust gas recirculation valve closing, post-injection opening and hydraulic loading ramp during operation, so as to improve the engine load resistance and reduce the speed drop; The hot start unit is used to adjust the hydraulic power loading ramp, engine lamda correction and close the exhaust gas recirculation valve during the first operation of the excavator if the starting condition of the excavator is: hot start, so as to improve the engine's load resistance and reduce speed drop.

6. The device according to claim 5, characterized in that The operating condition judgment unit includes: a cold start operating condition subunit and a hot start operating condition subunit; The cold start working condition subunit is used to determine the starting working condition of the excavator as cold start after the excavator is started, if the water temperature of the excavator is not greater than a first preset water temperature and the hydraulic oil temperature of the excavator is not greater than a first preset oil temperature; The hot start condition subunit is used to determine that the starting condition of the excavator is hot start if the water temperature of the excavator is greater than the first preset water temperature and not greater than the second preset water temperature, and the hydraulic oil temperature of the excavator is greater than the first preset oil temperature and not greater than the second preset oil temperature.

7. The device according to claim 5, characterized in that The cold start unit comprises: a confluence valve closing subunit, a circulation valve closing subunit, a mode switching subunit, a post-spray opening subunit, a first ramp adjustment subunit and a first lamda adjustment subunit; The confluence valve closing subunit is used to control the bucket confluence valve to close when the excavator is in operation if the starting condition of the excavator is: cold start, so as to overflow the pressure at the hydraulic pump end and increase the engine load; The circulation valve closing subunit is used to control the closing of the exhaust gas recirculation valve and the intake throttle valve; The mode switching subunit is used to switch to a normal operating mode; The post-injection opening subunit is used to open the post-injection to increase the combustion temperature and the intake level; The first ramp adjustment subunit is used to adjust the hydraulic power loading ramp value according to the current hydraulic oil temperature; The first lamda adjustment subunit is used to increase the rotation speed of the excavator to a preset rotation speed and adjust the lamda coefficient to 1.

8. The device according to claim 5, characterized in that The hot start unit includes: a second ramp adjustment subunit and a second lamda adjustment subunit; The second ramp adjustment subunit is used to adjust the hydraulic power loading ramp value of the excavator during the first operation if the starting condition of the excavator is: hot start; The second lamda adjustment subunit is used to close the exhaust gas recirculation valve and adjust the current lamda coefficient to 1.

9. A computer-readable storage medium having a program stored thereon, characterized in that: When the program is executed by a processor, the excavator anti-speed drop control method according to any one of claims 1 to 4 is implemented.

10. An electronic device, characterized in that: The electronic device includes at least one processor, and at least one memory and a bus connected to the processor; wherein the processor and the memory communicate with each other through the bus; the processor is used to call the program instructions in the memory to execute the excavator anti-speed drop control method as described in any one of claims 1 to 4.

Images