CN105156408A - Loader fan driving hydraulic system and positive and negative rotation switching method - Google Patents
Loader fan driving hydraulic system and positive and negative rotation switching method Download PDFInfo
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- CN105156408A CN105156408A CN201510516574.9A CN201510516574A CN105156408A CN 105156408 A CN105156408 A CN 105156408A CN 201510516574 A CN201510516574 A CN 201510516574A CN 105156408 A CN105156408 A CN 105156408A
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Abstract
The invention discloses a loader fan driving hydraulic system and a positive and negative switching method. According to the system, functions of intelligent temperature control and fan negative rotation can be achieved mainly through an electric proportional directional valve, a pressure compensation valve, an ECU control box and a positive and negative rotation motor. The invention further discloses a loader fan positive and negative rotation switching method. Fan negative rotation comprises three different negative rotation modes of starting-up negative rotation, instruction negative rotation and time negative rotation. The ECU control box is used for controlling a loader independent cooling system in a unified manner, and the intelligent temperature control function is achieved; the rotating speed of a fan is adjusted according to the temperature of all media, no direct relation exists between the rotating speed of the fan and the rotating speed of an engine, and the energy-saving effect is achieved well; meanwhile, the intelligent negative rotation function is achieved, a radiator better dissipates heat, the continuous work time of a loader is prolonged, and the working efficiency is improved; and the specific three-position electric proportional directional valve is adopted, zero impact of positive and negative rotation switching can be achieved, and the service life of all elements and the fan of the hydraulic system is prolonged.
Description
Technical field
The present invention relates to a kind of loader fan drive system, a kind of method of specifically loader fans drive hydraulic system and clockwise and anticlockwise switching.
Background technique
Due to loader operating mode very severe, dust after work a period of time in air can be blocked radiator, blow off so need fan to carry out the dust reversed blocking up on a heat sink, radiator is allowed better to dispel the heat, current high end loader has brought into use the fan drive system of band fan reverse function, but fan drive system is all the reverse function being realized fan by the solenoid directional control valve of two four-ways at present, in the process that this mode switches in fan clockwise and anticlockwise, solenoid valve directly commutates, can not stop completely at commutation process fan, larger to the impact of fan, reduce the working life of fan, and the impact of hydraulic system is also very large, reduce the working life of hydraulic parts.
And the rotating speed of existing fan normally controls according to the rotating speed of motor, and namely the higher rotation speed of the fan of engine speed is higher, adjust according to the true temperature of medium, often cause the waste that the energy is unnecessary.
Summary of the invention
For above-mentioned prior art Problems existing, the invention provides a kind of method of loader fans drive hydraulic system and clockwise and anticlockwise switching, the rotating speed of fan adjusts according to the temperature of each medium, realizes the function of intelligent temperature control, good energy-conserving effect; Achieve fan intelligence reverse function simultaneously, allow radiator better dispel the heat, extend the time of loader continuous operation, increase work efficiency; Realize fan clockwise and anticlockwise and switch zero impact, improve the working life of each element of hydraulic system and fan.
To achieve these goals, a kind of loader fans drive of the present invention hydraulic system, comprises gear pump, hydraulic oil container, radiator, pressure-compensated valve, electric proportional reversing valve, clockwise and anticlockwise motor, ECU Direct box, temperature transducer, one-way valve, speed probe and engine control box; Described gear pump filler opening is connected with hydraulic oil container, and oil outlet is connected with the P mouth of electric proportional reversing valve with pressure-compensated valve respectively; Pressure-compensated valve is connected with heat sink inlet, and radiator outlet is connected with hydraulic oil container; Described electric proportional reversing valve T mouth is connected with the import of radiator, and proportional reversing valve A, B mouth is connected with the oil inlet and outlet of clockwise and anticlockwise motor respectively, and proportional reversing valve C, D mouth is connected with the import of one-way valve, and the oil outlet of two one-way valves is connected with pressure-compensated valve a mouth; The b mouth of pressure-compensated valve is connected with the oil outlet of gear pump; Described ECU Direct box is connected with electric proportional reversing valve, four be respectively used to gather cooling liquid, hydraulic oil, torque-converters oil, middle cold air the temperature transducer of temperature signal be connected with ECU Direct box, and be loaded into the inlet of four radiators respectively; Described speed probe is integrated on clockwise and anticlockwise motor and is connected with ECU Direct box, the tach signal of Real-time Collection clockwise and anticlockwise motor; ECU Direct box is connected with engine control box, the tach signal of Real-time Collection motor.
The present invention is further, and described ECU Direct box is connected with instruction invert button.So that realize fan toggling command.
The present invention is further, is integrated with safety valve and one-way valve in described clockwise and anticlockwise motor; When the pressure of system pressure higher than safety valve setting, safety valve is opened, and fluid directly flows through one-way valve oil sump tank from safety valve.Can ensure that clockwise and anticlockwise motor works under normal working pressure, extend its working life.
The present invention also provides a kind of method utilizing above-mentioned loader fans drive HYDRAULIC CONTROL SYSTEM loader fan clockwise and anticlockwise to switch, and comprises the steps:
A. when meeting turn around condition, ECU Direct box progressively improves output current, and now electric proportional reversing valve valve port opening reduces gradually, and rotation speed of the fan reduces gradually;
B., when the electric current exported when ECU Direct box makes the spool of electric proportional reversing valve at meta, the oil inlet and outlet of clockwise and anticlockwise motor is all connected to hydraulic oil container, and the fluid of gear pump all passes through pressure-compensated valve oil sump tank, and fan is in the effect decline slow-speed of revolution of resistance of air;
C., when ECU Direct box detects the signals of rotational speed sensor on clockwise and anticlockwise motor, when rotating speed is reduced to 0, ECU Direct box can continue to increase High-current output until maximum, and now electric proportional reversing valve spool is at low order end, and fan reverses with maximum speed;
D. when inverted between to setting value time, ECU Direct box progressively reduces output current, rotation speed of the fan reduces gradually, the electric current exported when ECU Direct box makes the spool of electric proportional reversing valve at meta, now the oil inlet and outlet of clockwise and anticlockwise motor is all connected to hydraulic oil container, the fluid of gear pump all passes through pressure-compensated valve oil sump tank, and fan slowly reduces rotating speed under the effect of resistance of air;
E., when ECU Direct box detects the signals of rotational speed sensor on clockwise and anticlockwise motor, when rotating speed is reduced to 0, ECU Direct box can continue to reduce output current until electric proportional reversing valve spool can be made to get back to left position, and fan rotates forward.
The present invention is further, described turn around condition is start reversion, when after start, ECU Direct box detection engine speed is greater than 500r/min, ECU Direct box performs rollback routine, reversing time is to automatically recovering during setting value to rotate forward, when be energized but engine speed lower than 500r/min time, fan is nonreversible.
The present invention is further, and described turn around condition is instruction reversion, and by the invert button that gives an order, ECU Direct box performs rollback routine, and reversing time is to automatically recovering during setting value to rotate forward.But, when in cooling liquid, hydraulic oil torque-converters oil and cold air, the temperature of any one medium does not perform rollback routine higher than its highest setting value or engine speed more than 1200r/min, ECU Direct box.
The present invention is further, and described turn around condition is time reversal, and in loader course of normal operation, during to the time cycle set, ECU Direct box can automatically perform primary air fan rollback routine.But, when in cooling liquid, hydraulic oil, torque-converters oil and cold air, the temperature of any one medium does not perform rollback routine higher than its highest setting value or engine speed more than 1200r/min, ECU Direct box, until next cycle, if meet turn around condition, then reverse.
The present invention utilizes ECU Direct box unified control loader independence radiation system, and achieve the function of intelligent temperature control, namely the rotating speed of fan adjusts according to the temperature of each medium, does not have direct relation, well play energy-saving effect with engine speed; Achieve intelligent reverse function simultaneously, due to loader operating mode very severe, dust after work a period of time in air can be blocked radiator, blow off so need fan to carry out the dust reversed blocking up on a heat sink, radiator is allowed better to dispel the heat, extend the time of loader continuous operation, improve working efficiency; System adopts distinctive three electric proportional reversing valves, can realize fan clockwise and anticlockwise and switch zero impact, improve the working life of each element of hydraulic system and fan.
1) control electric proportional reversing valve by ECU Direct box and realize the intelligent temperature control function that loader independently dispels the heat, reduce the power loss of radiation system, play good energy-saving effect.
2) control electric proportional reversing valve by ECU Direct box and realize the intelligent reverse function that loader independently dispels the heat, and three kinds of inversion modes can be realized.Fan reversion serves good automated cleaning effect, extends the time of loader continuous operation, improves working efficiency.
3) achieve intelligent temperature control and reverse function by three electric proportional reversing valves, fan clockwise and anticlockwise can be realized and switch zero impact, improve the working life of each element of hydraulic system and fan.
4) adopt bus control system, above-mentioned all functions are all unified to control by an ECU Direct box, and system layout is compact attractive in appearance.
5) adopt open control mode, the secondary development of support control system, user can expand as required or strengthen some function.
Accompanying drawing explanation
Fig. 1 is electric liquid structural principle schematic diagram of the present invention;
Fig. 2 is rotation speed of the fan intelligent temperature control function control flow chart;
Fig. 3 is fan intelligence reversion control flow chart.
In figure: 1, gear pump, 2, hydraulic oil container, 3, radiator, 4, pressure-compensated valve, 5, electric proportional reversing valve, 6, safety valve, 7, one-way valve, 8, clockwise and anticlockwise motor, 9, ECU Direct box, 10, temperature transducer, 11, one-way valve, 12, speed probe, 13, engine control box, 14, instruction invert button.
Embodiment
In order to make those skilled in the art person understand the present invention program better, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, loader fans drive hydraulic system of the present invention, comprises gear pump 1, hydraulic oil container 2, radiator 3, pressure-compensated valve 4, electric proportional reversing valve 5, clockwise and anticlockwise motor 8, ECU Direct box 9, temperature transducer 10, one-way valve 11, speed probe 12 and engine control box 13; Described gear pump 1 filler opening is connected with hydraulic oil container 2, and oil outlet is connected with the P mouth of pressure-compensated valve 4 with electric proportional reversing valve 5 respectively; Pressure-compensated valve 4 is connected with radiator 3 import, and radiator 3 exports and is connected with hydraulic oil container 2; Described electric proportional reversing valve 5T mouth is connected with the import of radiator 3, proportional reversing valve 5A, B mouth is connected with the oil inlet and outlet of clockwise and anticlockwise motor 8 respectively, proportional reversing valve 5C, D mouth is connected with the import of one-way valve 11, and the oil outlet of two one-way valves 11 is connected with pressure-compensated valve 4a mouth; The b mouth of pressure-compensated valve 4 is connected with the oil outlet of gear pump 1, described ECU Direct box 9 is connected with electric proportional reversing valve 5, four be respectively used to gather cooling liquid, hydraulic oil, torque-converters oil, middle cold air the temperature transducer 10 of temperature signal be connected with ECU Direct box 9, and be loaded into the inlet of four radiators 3 respectively; Described speed probe 12 is integrated on clockwise and anticlockwise motor 8 and is connected with ECU Direct box 9, the tach signal of Real-time Collection clockwise and anticlockwise motor 8; ECU Direct box 9 is connected with engine control box 13, the tach signal of Real-time Collection motor.
Because a, b mouth of pressure-compensated valve 4 is connected with the oil outlet of electric proportional reversing valve 5 with the oil outlet of gear pump 1 respectively.When electric proportional reversing valve 5 spool is at high order end, electricity proportional reversing valve 5P mouth pressure equals pressure-compensated valve 4b mouth pressure, because the A mouth of electric proportional reversing valve 5 and C mouth, B mouth and D mouth communicate, so B mouth pressure equals the pressure of pressure-compensated valve 4a mouth, upper spring setting pressure is added because pressure-compensated valve 4b mouth pressure equals a mouth pressure, so electric proportional reversing valve 5 oil inlet and outlet pressure reduction is definite value, be the setting pressure of pressure-compensated valve 4 medi-spring.The valve port opening that just can ensure to enter the hydraulic fluid flow rate of clockwise and anticlockwise motor 8 and electric proportional reversing valve 5 is in this case proportional.Namely valve port opening is larger, and the flow entering clockwise and anticlockwise motor 8 is larger, and rotation speed of the fan is faster; Otherwise rotation speed of the fan is slower.When driver step on the gas engine speed change time, the hydraulic fluid flow rate that gear pump 1 exports can change, but because electric proportional reversing valve 5 oil inlet and outlet pressure reduction is certain, as long as so its valve port opening does not change, system flow is just certain toward the flow of clockwise and anticlockwise motor 8, rotation speed of the fan does not change, more than hydraulic oil can directly flow back to hydraulic oil container 2 by pressure-compensated valve 4.That is the rotating speed of fan and engine speed do not have direct relation.
In fig. 2, cooling liquid, hydraulic oil, torque-converters oil and cold air four kinds of media are set with a temperature range respectively, and in this temperature range, rotation speed of the fan raises according to the rising of temperature.When during loader just cycling start, the temperature of All Media is all lower than its minimum setting value, the electric current that now ECU Direct box 9 exports makes electric proportional reversing valve 5 spool in left position, and valve port opening is minimum, now fan rotates forward with minimum speed, air quantity of fan is minimum, be conducive to various medium temperature to raise fast, increase hot vehicle speed, reduce the wearing and tearing of system; Along with the operating time of loader increases, the temperature of each medium raises gradually, and when the temperature of any one medium is higher than its minimum setting value, ECU Direct box 9 can export by reduction electric current progressively, the valve port opening of electricity proportional reversing valve 5 can increase progressively, and rotation speed of the fan progressively increases; When any one medium temperature higher than its highest setting value time, now ECU Direct box 9 output current becomes 0, and electric proportional reversing valve 5 moves to high order end under the action of the spring, and now valve port opening is maximum, and fan rotates with maximum speed, is conducive to the heat radiation of medium.In summary, the present invention utilizes ECU Direct box unified control loader independence radiation system, and achieve the function of intelligent temperature control, namely the rotating speed of fan adjusts according to the temperature of each medium, does not have direct relation, well play energy-saving effect with engine speed;
On said structure basis, in clockwise and anticlockwise motor 8, be integrated with safety valve 6 and one-way valve 7; When clockwise and anticlockwise motor 8 rotates forward, hydraulic oil enters the filler opening of motor by the P mouth of electric proportional reversing valve 5, now fan normally rotates forward, when the pressure that system pressure sets higher than safety valve 6, safety valve 6 is opened, fluid does not flow through clockwise and anticlockwise motor 8 and directly flows through one-way valve 7 oil sump tank from safety valve 6, and reversion in like manner.Can ensure that clockwise and anticlockwise motor 8 works under normal working pressure.Extend its working life.
In addition the present invention gives a kind of method utilizing above-mentioned loader fans drive HYDRAULIC CONTROL SYSTEM loader fan clockwise and anticlockwise to switch, and as shown in Figure 3, comprises the steps:
A. when meeting turn around condition, ECU Direct box 9 progressively improves output current, and now electric proportional reversing valve 5 valve port opening reduces gradually, and rotation speed of the fan reduces gradually;
B. when the electric current exported when ECU Direct box 9 makes the spool of electric proportional reversing valve 5 at meta, the oil inlet and outlet of clockwise and anticlockwise motor 8 is all connected to hydraulic oil container 2, the fluid of gear pump 1 all passes through pressure-compensated valve 4 oil sump tank, and fan is in the effect decline slow-speed of revolution of resistance of air;
C. speed probe 12 signal on clockwise and anticlockwise motor 8 detected when ECU Direct box 9, when rotating speed is reduced to 0, ECU Direct box 9 can continue to increase High-current output until maximum, and now electric proportional reversing valve 5 spool is at low order end, and fan reverses with maximum speed;
D. when inverted between to setting value time, ECU Direct box 9 progressively reduces output current, rotation speed of the fan reduces gradually, the electric current exported when ECU Direct box 9 makes the spool of electric proportional reversing valve at meta, now the oil inlet and outlet of clockwise and anticlockwise motor 8 is all connected to hydraulic oil container 2, the fluid of gear pump 1 all passes through pressure-compensated valve 4 oil sump tank, and fan slowly reduces rotating speed under the effect of resistance of air;
E. speed probe 12 signal on clockwise and anticlockwise motor 8 detected when ECU Direct box 9, when rotating speed is reduced to 0, ECU Direct box 9 can continue to reduce output current until electric proportional reversing valve 5 spool can be made to get back to left position, and fan rotates forward.
Fan can be allowed to realize zero impact when clockwise and anticlockwise switches by three electric proportional reversing valves 5 of said method and uniqueness of the present invention, well protect fan, increase the working life of fan and system.
In above-mentioned steps A, turn around condition has three kinds, namely following three kinds of fan inversion modes are had: 1, start reversion, after start, ECU Direct box 9 detects engine speed when being greater than 500r/min, ECU Direct box 9 performs rollback routine, reversing time is to automatically recovering during setting value to rotate forward, when be energized but engine speed lower than 500r/min time, fan is nonreversible.
2, instruction reversion, ECU Direct box 9 of the present invention is arranged and is connected with instruction invert button 14, by giving an order, invert button 14, ECU Direct box 9 performs rollback routine, and reversing time is to automatically recovering during setting value to rotate forward.In cooling liquid, hydraulic oil torque-converters oil and cold air, the temperature of any one medium does not perform rollback routine higher than its highest setting value or engine speed more than 1200r/min, ECU Direct box 9.
3, turn around condition is time reversal, and in loader course of normal operation, during to the time cycle set, ECU Direct box 9 can automatically perform primary air fan rollback routine.In cooling liquid, hydraulic oil torque-converters oil and cold air, the temperature of any one medium does not perform rollback routine higher than its highest setting value or engine speed more than 1200r/min, ECU Direct box 9, until next cycle, if meet turn around condition, then reverses.
Certainly, above-described embodiment is only preferred version of the present invention, is specifically not limited thereto, and can make pointed adjustment according to actual needs on this basis, thus obtain different mode of executions.Because mode in the cards is more, just illustrate no longer one by one here.
Claims (9)
1. a loader fans drive hydraulic system, it is characterized in that, comprise gear pump (1), hydraulic oil container (2), radiator (3), pressure-compensated valve (4), electric proportional reversing valve (5), clockwise and anticlockwise motor (8), ECU Direct box (9), temperature transducer (10), one-way valve (11), speed probe (12) and engine control box (13);
Described gear pump (1) filler opening is connected with hydraulic oil container (2), and oil outlet is connected with the P mouth of pressure-compensated valve (4) with electric proportional reversing valve (5) respectively; Pressure-compensated valve (4) is connected with radiator (3) import, and radiator (3) outlet is connected with hydraulic oil container (2);
Described electric proportional reversing valve (5) T mouth is connected with the import of radiator (3), proportional reversing valve (5) A, B mouth is connected with the oil inlet and outlet of clockwise and anticlockwise motor (8) respectively, proportional reversing valve (5) C, D mouth is connected with the import of one-way valve (11), and the oil outlet of two one-way valves (11) is connected with pressure-compensated valve (4) a mouth; The b mouth of pressure-compensated valve (4) is connected with the oil outlet of gear pump (1),
Described ECU Direct box (9) is connected with electric proportional reversing valve (5), four be respectively used to gather cooling liquid, hydraulic oil, torque-converters oil, middle cold air the temperature transducer (10) of temperature signal be connected with ECU Direct box (9), and be loaded into the inlet of four radiators (3) respectively; Described speed probe (12) is integrated in clockwise and anticlockwise motor (8) and is above connected with ECU Direct box (9), the tach signal of Real-time Collection clockwise and anticlockwise motor (8); ECU Direct box (9) is connected with engine control box (13), the tach signal of Real-time Collection motor.
2. loader fans drive hydraulic system according to claim 1, is characterized in that, described ECU Direct box (9) is connected with instruction invert button (14).
3. loader fans drive hydraulic system according to claim 1, is characterized in that, is integrated with safety valve (6) and one-way valve (7) in described clockwise and anticlockwise motor (8); When the pressure that system pressure sets higher than safety valve (6), safety valve (6) is opened, and fluid directly flows through one-way valve (7) oil sump tank from safety valve (6).
4. the method utilizing the loader fans drive HYDRAULIC CONTROL SYSTEM loader fan clockwise and anticlockwise described in claim 1 to 3 to switch, is characterized in that, comprise the steps:
A. when meeting turn around condition, ECU Direct box (9) progressively improves output current, and now electric proportional reversing valve (5) valve port opening reduces gradually, and rotation speed of the fan reduces gradually;
B. when the electric current exported when ECU Direct box (9) makes the spool of electric proportional reversing valve (5) at meta, the oil inlet and outlet of clockwise and anticlockwise motor (8) is all connected to hydraulic oil container (2), the fluid of gear pump (1) all passes through pressure-compensated valve (4) oil sump tank, and fan is in the effect decline slow-speed of revolution of resistance of air;
C. speed probe (12) signal on clockwise and anticlockwise motor (8) is detected when ECU Direct box (9), when rotating speed is reduced to 0, ECU Direct box (9) can continue to increase High-current output until maximum, and now electric proportional reversing valve (5) spool is at low order end, and fan reverses with maximum speed;
D. when inverted between to setting value time, ECU Direct box (9) progressively reduces output current, rotation speed of the fan reduces gradually, the electric current exported when ECU Direct box (9) makes the spool of electric proportional reversing valve at meta, now the oil inlet and outlet of clockwise and anticlockwise motor (8) is all connected to hydraulic oil container (2), the fluid of gear pump (1) all passes through pressure-compensated valve (4) oil sump tank, and fan slowly reduces rotating speed under the effect of resistance of air;
E. speed probe (12) signal on clockwise and anticlockwise motor (8) is detected when ECU Direct box (9), when rotating speed is reduced to 0, ECU Direct box (9) can continue to reduce output current until electric proportional reversing valve (5) spool can be made to get back to left position, and fan rotates forward.
5. the method for loader fan clockwise and anticlockwise switching according to claim 4, it is characterized in that, described turn around condition is start reversion, when after start, ECU Direct box (9) detection engine speed is greater than 500r/min, ECU Direct box (9) performs rollback routine, reversing time to automatically recover during setting value rotate forward, when be energized but engine speed lower than 500r/min time, fan is nonreversible.
6. the method for loader fan clockwise and anticlockwise switching according to claim 4, it is characterized in that, described turn around condition is instruction reversion, by the invert button that gives an order (14), ECU Direct box (9) performs rollback routine, and reversing time is to automatically recovering during setting value to rotate forward.
7. the method for loader fan clockwise and anticlockwise switching according to claim 6, it is characterized in that, in cooling liquid, hydraulic oil torque-converters oil and cold air, the temperature of any one medium does not perform rollback routine higher than its highest setting value or engine speed more than 1200r/min, ECU Direct box (9).
8. the method for loader fan clockwise and anticlockwise switching according to claim 4, it is characterized in that, described turn around condition is time reversal, in loader course of normal operation, during to the time cycle set, ECU Direct box (9) can automatically perform primary air fan rollback routine.
9. the method for loader fan clockwise and anticlockwise switching according to claim 8, it is characterized in that, in cooling liquid, hydraulic oil torque-converters oil and cold air the temperature of any one medium higher than its highest setting value or engine speed more than 1200r/min, ECU Direct box (9) does not perform rollback routine, until next cycle, if meet turn around condition, then reverse.
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| CN201510516574.9A CN105156408A (en) | 2015-08-21 | 2015-08-21 | Loader fan driving hydraulic system and positive and negative rotation switching method |
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| CN201510516574.9A CN105156408A (en) | 2015-08-21 | 2015-08-21 | Loader fan driving hydraulic system and positive and negative rotation switching method |
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Application publication date: 20151216 |
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