A control system for an engineering vehicle having a back-up power supply

Abstract

The application provides a control system of an engineering vehicle with standby power, comprising an engine for providing power for a walking control system and an implement control system, and a standby motor pump connected to the walking control system through a walking standby oil circuit and connected to the implement control system through an implement standby oil circuit, wherein the standby motor pump provides power for the walking control system and the implement control system when the engine fails, and the standby motor pump supplies oil to the implement control system when the engine is disabled, so that the implement such as a fork, a bucket and the like is retracted or lowered to a low position to avoid collision with obstacles such as high-temperature pipelines, furnace walls and the like; the standby motor pump supplies oil to the walking control system, so that the engineering vehicle with failure is quickly withdrawn from a high-temperature area such as a boiler room, a foundry and the like to avoid spontaneous combustion of hydraulic oil due to continuous heating, and the standby motor pump is calculated by a power selection formula of the standby motor pump to meet the use requirement.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engineering vehicles, in particular to a control system of an engineering vehicle with backup power. BACKGROUND

[0002] In high-temperature working environments such as boiler rooms, casting workshops, steel rolling lines, etc., engineering vehicles (such as forklifts, loading trucks, etc.) are widely used for material handling, loading and unloading, and short-distance transportation operations. When the engine of the engineering vehicle fails, the engineering vehicle cannot move, but since it is in a high-temperature environment, the hydraulic oil inside the engineering vehicle is prone to spontaneous combustion due to high temperature, which poses a safety hazard. Therefore, the engineering vehicle needs to be driven away from the high-temperature environment as soon as possible.

[0003] Due to the damage of the engine, only external rescue vehicles (such as tow trucks or towing trucks) can be relied on for manual towing. However, the high-temperature working area may have limited space and narrow passages, making it difficult for external rescue vehicles to quickly reach the scene, and the rescue operation is complicated and the response time is long. In addition, in order to ensure the timeliness of rescue, external rescue vehicles often need to be on standby for a long time, resulting in a significant increase in factory operating costs.

[0004] When the failed engineering vehicle is stranded in the passage or intersection of the high-temperature area waiting for external rescue, since the high-temperature area usually adopts a one-way circulation or fixed track logistics path design, the failed engineering vehicle may force multiple normally operating engineering vehicles to be interrupted, forming a "single-point blocking" phenomenon. The longer the rescue waiting time, the more vehicles in line, and in severe cases, the entire production line logistics is stalled, directly affecting the on-time transfer of molten steel, cast billets, and other high-temperature materials, thereby reducing overall production efficiency and increasing energy consumption. Therefore, the passive waiting of the failed engineering vehicle not only amplifies the safety risk, but also becomes a bottleneck restricting the continuous and efficient operation of the high-temperature working area. SUMMARY

[0005] In view of the deficiencies in the prior art, the present application aims to provide a control system of an engineering vehicle with backup power to solve the problems mentioned in the background section.

[0006] The present application is achieved by the following technical solutions:

[0007] A control system of an engineering vehicle with backup power, comprising an engine for providing power to a walking control system and an accessory control system, further comprising:

[0008] A standby motor pump is connected to the traveling control system through a traveling standby oil path, and the standby motor pump is connected to the tool control system through a tool standby oil path, and when the engine fails, the traveling control system and the tool control system are powered by the standby motor pump;

[0009] The power of the standby motor pump satisfies the following formula calculation:

[0010] ;

[0011] Wherein, represents the rated power of the standby motor pump, unit KW; represents the calculated minimum power requirement; represents the rolling resistance coefficient; represents the slope resistance rate; represents the total vehicle load, unit kg; represents the gravitational acceleration, unit m / s 2 ; represents the minimum evacuation speed, unit km / h; represents the transmission efficiency of the traveling control system; represents the tool oil cylinder flow, unit L / min; represents the tool working pressure, unit bar; represents the pump efficiency of the tool control system.

[0012] Further, the power of the standby motor pump satisfies: .

[0013] Further, it further includes a battery pack and a control unit, the battery pack is used to power the standby motor pump; the control unit is configured to distribute the power output by the standby motor pump to the traveling control system and the tool control system according to the setting, and the actual selected power of the standby motor pump is set to ;

[0014] Under normal circumstances, the control unit supplies the traveling control system with power according to , and the control unit supplies the tool control system with power according to , wherein, ;

[0015] In an emergency, the control unit cuts off the tool standby oil path, and supplies all the power to the traveling control system.

[0016] Further, it further includes a battery pack, a super capacitor and a control unit, and the actual selected power of the standby motor pump is set to ;

[0017] In normal conditions, the control unit supplies power to the travel control system according to In normal conditions, the control unit supplies power to the travel control system according to In normal conditions, the control unit supplies power to the travel control system according to ;

[0018] In emergency conditions, the control unit supplies power to the travel control system according to In emergency conditions, the control unit supplies power to the travel control system according to .

[0019] Further, the power of the backup motor pump satisfies the following formula:

[0020] ;

[0021] Wherein, represents the rated power of the selected backup motor pump, unit KW; represents the instantaneous power of the super capacitor supplied to the travel control system; represents the thermal time constant of the backup motor pump; represents the planned overload duration of the backup motor pump.

[0022] Further, it further comprises a first oil pressure sensor and a second oil pressure sensor, the first oil pressure sensor is arranged in the travel backup oil circuit, and the second oil pressure sensor is arranged in the accessory backup oil circuit; the control unit is electrically connected with the engine, the backup motor pump, the first oil pressure sensor and the second oil pressure sensor respectively;

[0023] The control unit is configured to execute the following self-checking process when receiving the start signal of the engine:

[0024] S1: control to start the backup motor pump, provide power for the backup motor pump through the battery pack, and establish oil pressure;

[0025] S2: read the first oil pressure sensor and the second oil pressure sensor, and compare them with the preset pressure threshold value respectively, when the preset pressure threshold value is met, the battery pack and the backup motor pump meet the use demand.

[0026] Further, the control unit is further configured to:

[0027] A self-check trigger counter is provided in the internal memory to record the number of engine starts; the self-check trigger counter is incremented each time the control unit receives a signal that the engine start was successful;

[0028] When the value of the self-check trigger counter reaches or exceeds a preset threshold N, the control unit will automatically perform the self-check procedure after receiving the engine start signal;

[0029] After the self-check procedure is completed, the control unit resets the self-check trigger counter and starts counting again.

[0030] Further, the control unit is further configured to:

[0031] record the absolute time stamp of the last successful self-check procedure in the internal memory;

[0032] Whenever the engine start signal is received, calculate the number of days between the current time and the absolute time stamp of the last self-check procedure;

[0033] If the number of days reaches or exceeds a preset time threshold T, the self-check procedure is automatically performed immediately regardless of the value of the self-check trigger counter;

[0034] After the procedure is completed, update the time stamp of the last self-check procedure to the current time and reset the self-check trigger counter.

[0035] Further, the standby motor pump is provided with a priority valve after its working process, which is used to avoid the oil pressure of the travel control system and the implement control system acting on the standby motor pump.

[0036] Further, a temperature sensor is provided to obtain the ambient temperature around the engineering vehicle, and when the ambient temperature is lower than a set temperature threshold, the control unit performs power distribution in the normal case; when the ambient temperature is higher than the set temperature threshold, the control unit performs power distribution in the emergency case.

[0037] The beneficial effect of the present application is: a control system of an engineering vehicle with standby power, comprising: an engine for providing power for a travel control system and an implement control system; a standby motor pump connected to the travel control system through a travel standby oil circuit and connected to the implement control system through an implement standby oil circuit, and providing power for the travel control system and the implement control system through the standby motor pump when the engine fails; when the engine fails, the standby motor pump supplies oil to the implement control system, so that the implement such as a fork, a bucket, etc. is retracted or lowered to a low position to avoid collision with obstacles such as high-temperature pipelines, furnace walls, etc.; the standby motor pump supplies oil to the travel control system, so that the faulty engineering vehicle can quickly leave the high-temperature area such as a boiler room, a casting workshop, etc. to avoid spontaneous combustion of hydraulic oil due to continuous heating. Compared with the traditional scheme which needs to wait for an external rescue vehicle to enter the high-temperature area and manually connect, the time consumption is often more than 30 minutes; the present application uses the standby power system of the engineering vehicle to realize "self-rescue", and the evacuation can be completed within 10 minutes, which greatly reduces the rescue time of the engineering vehicle and saves the operating cost caused by long-term standby of the rescue vehicle. By driving the faulty engineering vehicle away, the passage is left open, and multiple normal engineering vehicles are prevented from queuing up, so that the high-temperature logistics path is continuous and unblocked, and the operation tempo and capacity of the whole production line are directly improved. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 FIG. 1 is a structural schematic diagram of the control system of the engineering vehicle of the present application.

[0039] Figure 2 FIG. 2 is a structural schematic diagram of the control system of the engineering vehicle with self-checking capability of the present application.

[0040] In the above drawings, the following reference signs are used:

[0041] 1, engine; 2, travel control system; 21, closed travel pump; 22, closed hydraulic control valve group; 23, travel motor; 24, normally closed brake control valve; 25, high-pressure circulation oil circuit; 26, low-pressure circulation oil circuit; 27, brake release oil circuit; 3, implement control system; 31, open pump; 32, implement control valve group; 33, implement; 4, standby power system; 41, standby motor pump; 42, travel solenoid valve; 43, pressure reducing valve; 44, travel standby oil circuit; 45, first travel standby branch; 451, first oil pressure sensor; 46, second travel standby branch; 461, second oil pressure sensor; 47, implement standby oil circuit; 48, change-over valve; 5, first three-way valve; 6, second three-way valve; 7, oil tank; 8, battery pack; 9, super capacitor. DETAILED DESCRIPTION

[0042] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. It should be noted that the descriptions of the embodiments are used to help understand the present application and do not constitute a limitation on the present application. In addition, the technical features involved in the various embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0043] Referring to Figure 1 and Figure 2 , a control system of an engineering vehicle with standby power comprises:

[0044] an engine 1 for providing power for a travel control system 2 and an implement control system 3;

[0045] the travel control system 2 comprises a closed travel pump 21, a closed hydraulic control valve group 22, a travel motor 23, and a normally closed brake control valve 24, wherein:

[0046] a power output shaft of the engine 1 is mechanically connected to a driving shaft of the closed travel pump 21 to drive the closed travel pump 21 to rotate;

[0047] a high-pressure circulation oil circuit 25 and a low-pressure circulation oil circuit 26 in series with the closed travel pump 21, the closed hydraulic control valve group 22, and the travel motor 23 are further included, and the closed travel pump 21 converts mechanical energy into hydraulic energy to establish a closed circulation with high and low pressure alternately between the high-pressure circulation oil circuit 25 and the low-pressure circulation oil circuit 26;

[0048] a brake release oil circuit 27 connected to the closed travel pump 21, the normally closed brake control valve 24, and the travel motor 23 is further included, and when the normally closed brake control valve 24 is in a closed position without control oil pressure, the travel motor 23 is stopped; when the engine 1 is normally running, control oil output by the closed travel pump 21 is delivered to the normally closed brake control valve 24 through the brake release oil circuit 27 to change the working position thereof, so that the travel motor 23 is normally running;

[0049] the implement control system 3 further comprises an open pump 31, an implement control valve group 32, and an executing implement 33, the open pump 31 is connected to the closed travel pump 21 to obtain power, and hydraulic oil output by the open pump 31 is delivered to the executing implement 33 after being regulated by the implement control valve group 32 to drive the executing implement 33 to complete a work action.

[0050] The above all belong to prior art, by starting engine 1, power output shaft drives closed walking pump 21 to rotate, closed walking pump 21 outputs high pressure oil→closed hydraulic control valve group 22→walking motor 23, forms high pressure / low pressure closed circulation, realizes vehicle walking.

[0051] Meanwhile, closed walking pump 21 supplies oil to normally closed brake control valve 24 through brake oil way 27, valve core transposition→removes walking motor 23 brake→vehicle can normally travel.

[0052] Closed walking pump 21 simultaneously drives open pump 31;Open pump 31 outputs hydraulic oil→attachment control valve group 32→executes attachment 33, completes the extension, lifting and other operation actions of attachment 33.

[0053] The improvement of the application is as follows:

[0054] Still include standby power system 4, the standby power system 4 includes standby motor pump 41, walking electromagnetic valve 42 and pressure reducing valve 43;

[0055] The standby motor pump 41 is connected with the attachment control valve group 32 through the attachment standby oil way 47, so that when the engine 1 fails, the attachment control valve group 32 is outputted with hydraulic oil by the standby motor pump 41 to drive the execution attachment 33 to complete the operation action;

[0056] The standby motor pump 41 is connected with the walking electromagnetic valve 42 through the walking standby oil way 44, and the walking electromagnetic valve 42 is connected with the walking motor 23 through the first walking standby branch 45, so that when the engine 1 fails, the walking electromagnetic valve 42 is outputted with hydraulic oil by the standby motor pump 41, the walking electromagnetic valve 42 controls the on-off, flow or direction of the hydraulic oil way, so as to drive the walking motor 23 to complete the walking action;

[0057] The walking electromagnetic valve 42 is connected with the pressure reducing valve 43 through the second walking standby branch 46, and the pressure reducing valve 43 is connected with the normally closed brake control valve 24, so that when the engine 1 fails, the walking electromagnetic valve 42 is outputted with hydraulic oil by the standby motor pump 41, and the pressure reducing valve 43 reduces the oil pressure inputted by the walking electromagnetic valve 42 to meet the oil pressure required by the normally closed brake control valve 24, so as to complete the release of the restriction to the walking motor 23.

[0058] When the engine 1 fails, the standby motor pump 41 supplies oil to the attachment control valve group 32 through the standby power system 4 in the application, and the attachment control valve group 32 controls the retraction or lowering of the execution attachment 33 such as fork, bucket and the like to the low position, so as to avoid collision with obstacles such as high temperature pipeline, furnace wall and the like in the factory building.

[0059] The standby motor pump 41 supplies oil to the walking standby oil path 44, the walking electromagnetic valve 42 is connected with the pressure reducing valve 43 through the second walking standby branch 46, the pressure reducing valve 43 is connected with the normally closed brake control valve 24, the pressure reducing valve 43 reduces the oil pressure input by the walking electromagnetic valve 42 to meet the oil pressure required by the normally closed brake control valve 24, so as to complete the release of the restriction on the walking motor 23;

[0060] The standby motor pump 41 supplies oil to the walking standby oil path 44, the walking electromagnetic valve 42 is connected with the walking motor 23 through the first walking standby branch 45, and the walking electromagnetic valve 42 controls the on-off, flow or direction of the hydraulic oil path to drive the walking motor 23 to complete the walking action.

[0061] By starting the standby power system 4, the fault engineering vehicle can quickly evacuate from the boiler room, the casting workshop and other high-temperature areas to avoid spontaneous combustion of hydraulic oil due to continuous heating. Compared with the traditional scheme which needs to wait for the external rescue vehicle to enter the high-temperature area and manually connect, the time consumption is often more than 30 minutes; the present application uses the self-provided standby power system 4 of the engineering vehicle to realize "self-rescue", which can complete the evacuation within 10 minutes, greatly reducing the waiting time of the engineering vehicle for rescue, and eliminating the operating cost caused by the long-term standby of the rescue vehicle. And the standby power system 4 can be started after the engine 1 is turned off, so that the fault engineering vehicle can drive away, immediately leaving the passage, avoiding the queuing of multiple normal engineering vehicles, ensuring the continuous and smooth flow of the high-temperature material flow path, and directly improving the operation rhythm and capacity of the whole production line.

[0062] Specifically, the first walking standby branch 45 is two branches, and the two branches are connected with the high-pressure circulating oil path 25 and the low-pressure circulating oil path 26 through two first three-way valves 5; similarly, the brake release oil path 27 and the second walking standby branch 46 are connected through a second three-way valve 6. When the engine 1 is damaged, the switching oil path of the first three-way valve 5 and the second three-way valve 6 is switched, so that the standby motor pump 41 drives the engineering vehicle to walk.

[0063] The power selection of the standby motor pump 41 needs to consider many factors, which are as follows:

[0064] First, the emergency performance requirement needs to ensure that it can provide power for the core action in the emergency scene of the pillow changing vehicle, including meeting the basic functions of "walking, steering and braking", and ensuring that the equipment can be safely evacuated or complete the key operation in emergency situations;

[0065] Second, the space and weight limitation, since the installation space of the engine compartment is very compact, the power of the standby motor pump 41 needs to be balanced with the compartment space and the overall vehicle weight to avoid the equipment size / weight exceeding the standard due to excessive power, which cannot be adapted to the existing installation layout;

[0066] Third, the cost control requirement, the power of the standby motor pump 41 is positively correlated with its price, the higher the power, the higher the procurement cost, which needs to balance the economy under the premise of meeting the performance.

[0067] Therefore, the power selection of the standby motor pump 41 needs to achieve "double adaptation": not only to meet the power use needs in emergency scenarios, but also to meet the space / weight constraints and price limits, to balance performance, layout and cost, so the standby motor pump 41 that meets the use demand is calculated by the following formula:

[0068] ;

[0069] Among them, represents the rated power of the standby motor pump 41, unit KW; represents the calculated minimum power requirement; represents the rolling resistance coefficient; represents the slope resistance rate; represents the full load mass of the vehicle, unit kg; represents the gravity acceleration, unit m / s 2 ; represents the minimum evacuation speed, unit km / h; represents the transmission efficiency of the walking control system 2; represents the tool cylinder flow, unit L / min; represents the tool working pressure, unit bar; represents the pump efficiency of the tool control system 3.

[0070] In one embodiment, The value range of is 0.02~0.03 for factory asphalt pavement, The slope resistance rate of is 0.01~0.02 under factory environment, and the minimum evacuation speed is 5km / h.

[0071] As preferred, the power of the standby motor pump 41 meets: (wherein is the actual selected power of the standby motor pump 41, is the minimum necessary power to meet emergency performance), which not only guarantees the power demand of the engineering vehicle in emergency, but also avoids unnecessary increase of equipment size / weight and procurement cost due to excessive power, and realizes the balance of performance and constraints.

[0072] As a first embodiment:

[0073] It also includes a battery pack 8, which supplies power to the standby motor pump 41.

[0074] The control unit is configured to distribute the power output by the backup motor pump 41 to the travel control system 2 and the implement control system 3 according to a set distribution, and set the actual selected power of the backup motor pump 41 to be ;

[0075] Under normal circumstances, the control unit supplies the travel control system 2 with power according to , and supplies the implement control system 3 with power according to , wherein ;

[0076] In an emergency, the control unit cuts off the implement backup oil circuit 47, and supplies the travel control system 2 with all the power .

[0077] The control unit is electrically connected to the first three-way valve 5 and the second three-way valve 6, the first three-way valve 5 and the second three-way valve 6 are solenoid valves, and the power is distributed by dynamically controlling the opening of the spool of the solenoid valve. In the hydraulic system, the relationship between power P, flow rate Q, and pressure p is Therefore, the flow rate Q can be adjusted by controlling the flow area (opening) of the solenoid valve, and the power is then distributed.

[0078] As an example of the first embodiment, when the backup motor pump 41 is working, under normal circumstances, both the travel control system 2 and the implement control system 3 can work, and the maximum travel speed of the engineering vehicle is 5 km / h. In an emergency, the control unit cuts off the implement backup oil circuit 47, and supplies the travel control system 2 with all the power , and the travel speed of the engineering vehicle is increased to 7 km / h or higher, significantly improving the moving efficiency in an emergency. This is equivalent to "power boosting" for the travel system under the condition that the power of the backup motor pump 41 remains unchanged, thereby increasing the travel speed of the engineering vehicle from a lower basic speed (such as 5 km / h) to a higher speed (such as 7 km / h), effectively solving the core pain point of slow movement under the condition that the power of the backup motor pump 41 is limited, enabling the vehicle to quickly evacuate from a dangerous area or reach a repair point, greatly improving safety and work efficiency.

[0079] As a second embodiment:

[0080] It also includes a battery pack 8, a super capacitor 9, and a control unit, and sets the actual selected power of the backup motor pump 41 to be ;

[0081] Under normal circumstances, the backup motor pump 41 is powered by the battery pack 8, the control unit supplies the travel control system 2 with power according to , and the control unit supplies the implement control system 3 with power according to power supply to the tool control system 3, wherein, ;

[0082] In an emergency, the backup motor pump 41 is powered by the super capacitor 9, and the super capacitor 9 provides transient power to power supply to the travel control system 2, wherein, .

[0083] Under normal circumstances, the battery pack 8 supplies power to the backup motor pump 41, which can stably meet the regular power requirements of the travel control system 2 and the tool control system 3; in an emergency, the super capacitor 9 can quickly provide transient power not less than the regular total power, which is beneficial for the engineering vehicle to quickly drive away from the dangerous area.

[0084] In the second embodiment, the power of the backup motor pump satisfies the following formula calculation:

[0085] ;

[0086] wherein, represents the rated power of the selected backup motor pump 41, in KW; represents the transient power supplied by the super capacitor 9 to the travel control system 2; represents the thermal time constant of the backup motor pump 41; represents the planned overload duration of the backup motor pump 41.

[0087] By combining the thermal time constant and the planned overload duration of the backup motor pump 41, the safe upper limit of the transient power is accurately quantified, effectively avoiding damage to the backup motor pump 41 due to excessive transient power and excessive thermal accumulation, greatly improving the reliability and service life of the backup power system under emergency working conditions, which not only ensures that the super capacitor 9 can provide transient power to meet the emergency travel requirements, but also prevents power redundancy design through the thermal constraint formula, so that the rated power of the backup motor pump 41 is more matched with the transient power requirement, avoiding the increase in equipment size and cost due to excessive pursuit of peak power, and achieving a balance between emergency performance and economy, space constraints.

[0088] It also includes a temperature sensor, through which the ambient temperature around the engineering vehicle is obtained, and when the ambient temperature is lower than the set temperature threshold, the control unit performs power distribution in the normal case; when the ambient temperature is higher than the set temperature threshold, the control unit performs power distribution in the emergency case.

[0089] For the high-temperature working environment of the boiler room, the foundry workshop, the steel rolling line and the like which are mainly applied by the engineering vehicle, when the environmental temperature is higher than the set threshold value, the emergency power distribution is automatically switched to, the super capacitor 9 is used to provide the instantaneous high power, and the vehicle can quickly respond to the power demand and quickly evacuate in the high-temperature, complex and possibly emergent risk scene; and when the environmental temperature is lower, the normal condition distribution power is used, the advantages of the battery pack 8 in stable power supply are fully played, and the energy efficiency utilization is optimized.

[0090] As an extension of the first embodiment and the second embodiment, since the engine 1 failure of the engineering vehicle belongs to a small probability event, there is a pain point that the standby power system 4 needs to be used when it may have failed due to long-term inactivity. In order to ensure the absolute reliability of the emergency function, the application realizes the automatic self-checking of the standby power system 4 through the following settings, in particular:

[0091] Referring to Figure 2 The control unit, the first oil pressure sensor 451 and the second oil pressure sensor 461 are further included, the first oil pressure sensor 451 is arranged on the walking standby oil circuit 44, and the second oil pressure sensor 461 is arranged on the accessory standby oil circuit 47; the control unit is electrically connected with the engine 1, the standby motor pump 41, the first oil pressure sensor 451 and the second oil pressure sensor 461 respectively;

[0092] The control unit is configured to execute the following self-checking process when receiving the starting signal of the engine 1:

[0093] S1: control to start the standby motor pump 41, provide power for the standby motor pump 41 through the battery pack 8, and establish oil pressure;

[0094] S2: read the first oil pressure sensor 451 and the second oil pressure sensor 461, and compare them with the preset pressure threshold value respectively, when the preset pressure threshold value is met, the battery pack 8 and the standby motor pump 41 meet the use demand.

[0095] In step S1, it is firstly verified that the power reserve of the battery pack 8 is sufficient, the power output is stable, and the electrical connection and mechanical operation function of the standby motor pump 41 are normal, which can successfully convert electrical energy into hydraulic energy.

[0096] In step S2, if each oil pressure sensor exceeds the respective preset pressure threshold value, it is directly proved that: first, the output performance of the standby motor pump 41 is normal, which can establish effective pressure; second, the walking standby oil circuit 44 pressure establishment is normal, which can effectively drive the engineering vehicle to walk.

[0097] As an extension of the above-mentioned embodiment, if the control unit performs the self-checking process of the backup power system 4 every time it receives the start signal, the following problems will arise:

[0098] First, user experience and operational efficiency: The complete self-checking process takes several seconds to complete the pressure building, testing, and resetting. Each time the vehicle is started, the driver needs to wait for the self-checking to complete before operating, resulting in unnecessary start delays and disrupting the continuity of operation. Especially in high-intensity operations that require frequent starting and stopping of the vehicle, this waiting time will significantly reduce operational efficiency and cause drivers to be dissatisfied.

[0099] Second, too frequent self-checking processes can weaken the core capability of emergency support: The primary mission of the backup power system 4 is to provide emergency energy when the engine 1 fails. The battery pack 8's power reserve is a valuable resource that is limited. Each time the self-checking process drives the backup motor pump 41 to idle and operates the electromagnetic valve to reverse, it will substantially consume the battery pack 8's power. If this operation is performed every time the vehicle is started, it is equivalent to continuously wasting the "life-saving electricity" reserved for emergency situations in non-emergency situations. It may lead to the battery pack 8's power being partially depleted due to frequent self-checking when a real failure occurs, making it impossible to support the required escape or rescue actions, rendering the backup system useless.

[0100] Therefore, to solve the above technical problems, the present application also includes the following operations:

[0101] The control unit is also configured to:

[0102] A self-checking trigger counter is provided in the internal memory to record the number of engine 1 starts; each time the control unit receives a signal indicating that the engine 1 has started successfully, the self-checking trigger counter is incremented;

[0103] When the value of the self-checking trigger counter reaches or exceeds a pre-set threshold N, the control unit will automatically perform the self-checking process of the backup power system 4 after receiving the engine 1 start signal;

[0104] After the self-checking process is completed, the control unit resets the self-checking trigger counter and starts counting again.

[0105] The above mechanism can associate the frequency of self-checking with the actual use intensity of the vehicle, ensuring that the backup power system 4 can be periodically and effectively verified, while completely avoiding the problems of component life loss and energy waste caused by excessive detection, and fundamentally solving the contradiction between "detection necessity" and "system loss".

[0106] To further ensure the reliability of the construction vehicle after long-term idling, the self-check triggering strategy of the system also introduces a forced detection mechanism in the time dimension. In the internal memory of the control unit, the absolute timestamp of the last successful completion of the self-check process is persistently stored. The control unit is connected with a real-time clock circuit, which provides a weak maintenance current from the battery after the vehicle is completely turned off, to ensure uninterrupted timing and no loss.

[0107] The control unit is also configured to:

[0108] record the absolute timestamp of the last successful completion of the self-check process in the internal memory;

[0109] calculate the interval days between the current time and the absolute timestamp of the last self-check process whenever the engine start signal is obtained;

[0110] if the interval days reach or exceed a preset time threshold T (for example, T = 30 days), regardless of the value of the self-check trigger counter, immediately preferentially automatically execute the self-check process of the standby power system 4;

[0111] After the process is completed, update the timestamp of the last self-check process to the current time, and clear the self-check trigger counter.

[0112] As a third embodiment:

[0113] The standby motor pump 41 is a plug-in standby motor pump, which is connected to an external industrial power source (such as 380V or 240V alternating current) through a conductive wire for driving. Its advantage is stable power, which completely avoids the risk of paralysis again due to the depletion of the battery pack 8. The defect is that its maneuvering range is limited by the location of the external power source interface and the length of the conductive wire. When the faulty construction vehicle needs to be moved a long distance, the plug-in and plug-out of the conductive wire and the replacement of the interface may need to be frequently operated to gradually move the construction vehicle out of the factory building or the work area, which is slightly cumbersome.

[0114] The standby motor pump 41 is provided with a priority valve after its process, which is used to relieve the pressure of the tool standby oil line 47 and the travel standby oil line 44. Since the power of the standby motor pump 41 is much smaller than that of the engine 1, it is more sensitive to overload and pressure impact. At the moment when the standby system starts, the oil line is maintained at high pressure due to the operation of the engine 1, and then the engine 1 is damaged and switched to the standby motor pump 41 for operation. The standby motor pump 41 will face a huge starting torque and impact load.

[0115] Therefore, when the standby motor pump 41 works, the hydraulic oil flows to the subsequent oil path through the priority valve, the outlet pressure of the standby motor pump 41 is maintained at a low level, the high-pressure oil can flow back to the oil tank 7 through the pressure relief channel, and the high-pressure oil is prevented from acting on the standby motor pump 41, so that the standby motor pump 41 is prevented from being burnt out.

[0116] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0117] In the description of the present application, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features.

[0118] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A control system for a work vehicle having backup power, comprising: An engine for powering a travel control system and an implement control system, characterized in that further comprising: a backup motor pump connected to the travel control system through a travel backup oil circuit and connected to the implement control system through an implement backup oil circuit, the backup motor pump providing power to the travel control system and the implement control system when the engine fails; the power of the backup motor pump satisfies the following formula: ； wherein, represents the rated power of the backup electric motor pump, in KW; represents the calculated minimum power requirement; represents the rolling resistance coefficient; represents the ramp resistance rate; represents the total vehicle loaded mass, in kg; represents the gravitational acceleration, in m / s 2 ; represents the minimum evacuation speed, in km / h; represents the transmission efficiency of the travel control system; represents the implement oil cylinder flow, in L / min; represents the implement working pressure, in bar; represents the pump efficiency of the implement control system; Also included are a battery pack, a super capacitor and a control unit, set the actual selected power of the standby motor pump is ; In normal conditions, the control unit supplies the walking control system with power according to In normal conditions, the control unit supplies the walking control system with power according to In normal conditions, the control unit supplies the walking control system with power according to ; In an emergency, power the backup motor pump by the supercapacitor, providing transient power by the supercapacitor to supply the walking control system, ; and ; the power of the backup motor pump satisfies the following formula: ； wherein, represents the rated power of the selected backup electric motor pump in KW; represents the instantaneous power supplied by the supercapacitor to the travel control system; represents the thermal time constant of the backup electric motor pump; represents the planned overload duration of the backup electric motor pump.

2. The control system of a work vehicle with backup power as set forth in claim 1, wherein: The power of the backup motor pump satisfies: .

3. The control system of a work vehicle with backup power as set forth in claim 1, wherein: further comprising a first oil pressure sensor and a second oil pressure sensor, the first oil pressure sensor being arranged in the travel backup oil circuit and the second oil pressure sensor being arranged in the implement backup oil circuit; the control unit being electrically connected to the engine, the backup motor pump, the first oil pressure sensor and the second oil pressure sensor respectively; the control unit being configured to execute the following self-checking process when receiving a start signal of the engine: S1: controlling to start the backup motor pump, providing power to the backup motor pump through the battery pack, and establishing oil pressure; S2: reading the first oil pressure sensor and the second oil pressure sensor, and comparing them with preset pressure thresholds respectively, when the preset pressure thresholds are met, the battery pack and the backup motor pump meet the use requirements.

4. The control system of a work vehicle with backup power of claim 3, wherein: the control unit being further configured to: a self-checking trigger counter is arranged in the internal memory for recording the number of engine starts; the self-checking trigger counter is added once every time the control unit receives a signal that the engine starts successfully; when the value of the self-checking trigger counter reaches or exceeds a preset threshold N, the control unit will automatically execute the self-checking process after obtaining the engine start signal; after the self-checking process is completed, the control unit clears the self-checking trigger counter and starts counting again.

5. The control system of a work vehicle with backup power of claim 4, wherein: the control unit being further configured to: record the absolute time stamp of the last successful completion of the self-checking process in the internal memory; calculate the interval days between the current time and the absolute time stamp of the last self-checking process every time the engine start signal is obtained; if the interval days reach or exceed a preset time threshold T, the self-checking process will be automatically executed immediately regardless of the value of the self-checking trigger counter; after the process is completed, update the time stamp of the last self-checking process to the current time and clear the self-checking trigger counter.

6. The control system of a work vehicle with backup power of claim 1, wherein: the backup motor pump is provided with a priority valve after its working procedure, the priority valve being used to avoid the oil pressure of the travel control system and the implement control system acting on the backup motor pump.

7. The control system of a work vehicle with backup power of claim 1, wherein: further comprising a temperature sensor, the ambient temperature around the engineering vehicle being obtained through the temperature sensor, when the ambient temperature is lower than a set temperature threshold, the control unit performs power distribution in the normal situation; when the ambient temperature is higher than the set temperature threshold, the control unit performs power distribution in the emergency situation.

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