CN109914522A - A kind of digger engine high temperature sectional guard method and device - Google Patents
A kind of digger engine high temperature sectional guard method and device Download PDFInfo
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- CN109914522A CN109914522A CN201910236214.1A CN201910236214A CN109914522A CN 109914522 A CN109914522 A CN 109914522A CN 201910236214 A CN201910236214 A CN 201910236214A CN 109914522 A CN109914522 A CN 109914522A
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Abstract
The invention discloses a kind of digger engine high temperature sectional guard method and device, it is divided into temperature gradient control and engine water temperature signal is transferred to controller by high temperature emergency flight control, temperature sensor, when water temperature is higher than T1When, temperature gradient control enables, and controller carries out water temperature rising gradient calculating first, if temperature gradient increases comparatively fast, cooling system output power is increased, rather than cooling system power is increased again until temperature rises to certain value, when water temperature is higher than T2, the starting of high temperature emergency flight control, controller issues signal, reduce engine speed to minimum or idling, reduce excavator main pump output power to minimum, be simultaneously emitted by alarm signal.Digger engine high temperature sectional guard method provided by the invention and device can carry out engine high-temperature protection in advance, reduce the probability that engine causes high temperature to damage because of emergency event by monitoring engine water temperature rising gradient signal.
Description
Technical field
The invention belongs to engine high-temperature protection technique fields, and in particular to a kind of digger engine high temperature sectional protection
Method and device.
Background technique
Engine overheat is easy to cause the failures such as scuffing of cylinder bore, endangers engine.The engine one configured on board a dredger is well matched
There is cooling system, makes engine operation in normal temperature range.But since excavator operating condition is complicated, cooling system may be because splashing
Rubble hit and damage, cause cooling system abnormal, engine water temperature rises rapid, eventually exceeds normal working temperature model
It encloses, this unexpected abnormality need to be handled in time, to protect engine.
Existing some technical methods can be adaptively adjusted engine high-temperature, Chinese Patent Application No.
CN102061719B, patent name: a kind of excavator overheating protection method, Chinese Patent Application No. CN103628517B, patent
Title: excavator safety control system and method, Chinese Patent Application No. CN202273263U, patent name: automatic warming and
Overheating protective control device, Chinese Patent Application No. CN1178008C, patent name: the control device of construction implement, China is specially
Sharp application number CN201320249607.4, patent name: excavator cooling system overtemperature protection system, patent as above is all to starting
Machine high temperature protection takes feasible measure, when engine water temperature increases, can increase the heat-sinking capability of cooling system, if hair
Motivation water temperature overheat, can reduce engine speed, power etc., but these methods do not provide it is unexpected to engine water temperature
The processing method of overheat, and general engine overheat processing method, possible process time are too long, when these methods work,
The irreversible damage of engine may have been had resulted in.
Summary of the invention
It is an object of the present invention to provide a kind of digger engine high temperature sectional guard method and devices, by monitoring engine
Water temperature rising gradient signal can carry out engine high-temperature protection in advance, abnormal high temperature or unexpected water temperature mistake occur in engine
Emergency protection can be given when hot in time, the probability that engine causes high temperature to damage because of emergency event is reduced, engine is avoided to damage
It is bad.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of digger engine high temperature sectional guard method, comprising the following steps: temperature sensor is by engine water temperature signal
It is transferred to controller, when water temperature is higher than T1When, temperature gradient control starting, controller carries out temperature gradient calculating, if beyond control
The setting temperature gradient of device processed, then improve the heat-sinking capability of cooling system；When water temperature is higher than T2When, high temperature emergency flight control enables,
Controller issues signal, reduce engine speed to idling or minimum speed, reduce excavator main pump output power to minimum, together
When control alarm issue alarm signal.
Further, the controller carries out the process of temperature gradient calculating are as follows: every 1s acquires an engine water temperature reality
When temperature value, the temperature value of rear one acquisition subtracts previous temperature value, the temperature gradient calculated for this；By Continuous plus
5 temperature gradient values are added up, and average temperature rising gradient is obtained；The real-time temperature values iterative calculation that every 1s is acquired, obtains
The average temperature rising gradient value changed over time, as the judgment criteria of temperature gradient, calculation formula are as follows:
In formula,For the engine water temperature real-time temperature values of n-th acquisition, T is averagely to appreciate in every 5s water temperature, i.e., in water temperature
Lifting speed.
Further, the water temperature rise speed T is higher than T DEG C of Δ of every 5s rising, and water temperature is more than T1, then temperature rise is carried out
Gradient control, controller send a control signal to radiator fan, increase radiating fan rotation speed, improve the heat radiation energy of cooling system
Power.
Further, described when monitoring control devices to engine water temperature are higher than T1When, enable high temperature sectional protection, temperature rise
Gradient control enables, and controller carries out temperature gradient calculating, calculates the speed that water temperature rises, it is assumed that: water temperature is in 0s
92 DEG C, be 93.5 DEG C in 5s；At 93.5 DEG C, the corresponding heat radiation power of cooling system is assumed to be 20kW, because temperature gradient reaches
To 1.5 DEG C, higher than the setting temperature gradient that every 5s rises 1 DEG C, controller issues control signal, controls cooling system heat radiation power
It is increased to 25Kw.
Further, the cooling system heat-sinking capability performance is controlled jointly by engine water temperature temperature value and temperature gradient
System, wherein the priority of temperature gradient control is high.When temperature gradient value does not reach setting temperature gradient, cooling system heat dissipation
Ability is related to water temperature value；When temperature gradient value reaches setting temperature gradient, cooling system heat-sinking capability is greater than at this time
The corresponding heat-sinking capability of water temperature, and temperature gradient value is bigger, and the heat-sinking capability that cooling system plays is bigger.
Further, the engine speed reduction and the reduction of main pump power are asynchronous, first progress main pump power drop
It is low, engine speed reduction is carried out again after main pump power is reduced to certain value, power and master when preventing low engine speeds
Pump power mismatch and caused by endanger.
Further, during temperature gradient is protected, the power of cooling system and engine, main pump power be by
With calculating, primary condition is that cooling system power adds main pump power no more than engine power.It is had reached in engine
In the case where maximum power, while cooling system power increases, to reduce main pump power, this power increase and reduction be
Certain time gradual change, be not mutation.
Further, including temperature sensor, cooling system, controller and alarm, the temperature sensor are placed in
In engine water tank, it is used for test engine water temperature, temperature sensor to be connected with controller input terminal and by the engine of test
Water temperature data is transmitted to controller and is handled, controller output end and engine, cooling system, alarm and excavator main pump
It is connected, for controlling engine speed, cooling system power and excavator main pump output power, alarm is controlled by controller
It alarms, temperature gradient calculating, the opening and closing of control temperature gradient control and high temperature emergency flight control, temperature is carried out by controller
Engine water temperature signal is transferred to controller and handled by sensor, when engine water temperature is higher than T1When, controller control temperature
It rises gradient control to enable, controller carries out temperature gradient calculating, if water temperature rise speed is higher than every 5s and rises T DEG C of Δ, accelerates
Radiating fan rotation speed increases cooling system output power, rather than increases cooling system function again until temperature rises to certain value
Rate；If temperature sensor test engine water temperature is more than T2And continue 10s, then controller control high temperature emergency protection starting, drop
Low engine speed to minimum or idling, reduce engine loading power to minimum, while the starting of high temperature emergency protection, control
Device control alarm processed issues alarm signal.
Further, the engine has recirculated water cooling system, when temperature sensor test engine water temperature is lower than
(T1- 20) when, controller issues control signal and controls radiating fan rotation speed to minimum, when water temperature is in (T1- 20)-T1When, control
Device issues control signal control radiating fan rotation speed and increases and increase with water temperature；When water temperature is higher than T2When, controller issues control
Signal controls radiating fan rotation speed in highest.
Further, it presets when engine water temperature reaches T2(T2< 105 DEG C) before, recirculated water cooling system has reached most
Big heat-sinking capability, engine radiating recirculated water will not boil at 105 DEG C.
Further, the controller is connect with radiator fan, engine and excavator main pump, the controllable heat dissipation of controller
Rotation speed of the fan, engine speed, excavator main pump output power.
It further, further include temperature sensor, controller, alarm, cooling system (radiator fan), temperature gradient control
System and high temperature emergency flight control, the temperature sensor are placed in engine water tank, are used for test engine water temperature, temperature sensing
Device, which is connected with controller input terminal and the engine water temperature data of test are transmitted to controller, to be handled, control output end with
Engine, radiator fan, alarm are connected with excavator main pump, for controlling engine speed, radiating fan rotation speed, excavator
Main pump output power, controller control alarm are alarmed, and controller is able to carry out temperature gradient calculating, controls temperature gradient
The opening and closing of control and high temperature emergency flight control.
Further, engine water temperature signal is transferred to controller by the temperature sensor, when water temperature is higher than T1When, temperature
It rises gradient control to enable, controller carries out water temperature rising gradient calculating first, if temperature gradient increases comparatively fast, increases heat dissipation
System output power, rather than cooling system power is increased again until temperature rises to certain value, when water temperature is higher than T2, high temperature answers
Anxious control starting, controller issue signal, and reduction engine speed to minimum or idling reduces excavator main pump output power extremely
It is minimum, it is simultaneously emitted by alarm signal.
Compared with prior art, the beneficial effects of the present invention are:
1, it using the engine water temperature rate of climb as whether the judgment criteria of high temperature emergency flight control is started, prevents because recycling water-cooled
The problem of system exception or caused engine temperature rise of failing are too fast, high temperature protection lags, more timely protects engine；
2, when engine high-temperature emergency flight control enables, engine still maintains certain revolving speed, on the one hand can maintain to recycle
Water-cooled system and lubricating system operation, further protect engine；On the other hand it can guarantee that excavator completes certain move
Make, prevents the generation of secondary hazards.
Detailed description of the invention
Fig. 1 is the flow chart of the embodiment of the present invention 1.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.
As shown in Figure 1, a kind of digger engine high temperature sectional guard method, comprising the following steps: temperature sensor will
Engine water temperature signal is transferred to controller, when water temperature is higher than T1When, temperature gradient control starting, controller carries out temperature gradient
It calculates, if exceeding the setting temperature gradient of controller, improves the heat-sinking capability of cooling system；When water temperature is higher than T2When, high temperature
Emergency flight control enables, and controller issues signal, reduces engine speed to idling or minimum speed, reduction excavator main pump output
Power controls alarm and issues alarm signal to minimum.
The process of controller progress temperature gradient calculating are as follows: every 1s acquires an engine water temperature real-time temperature values, latter
The temperature value of secondary acquisition subtracts previous temperature value, the temperature gradient calculated for this；By 5 temperature gradients of Continuous plus
Value is added up, and average temperature rising gradient is obtained；The real-time temperature values iterative calculation that every 1s is acquired, what is changed over time is flat
Equal temperature rise gradient value, as the judgment criteria of temperature gradient, calculation formula are as follows:
In formula,For the engine water temperature real-time temperature values of n-th acquisition, T is averagely to appreciate in every 5s water temperature, i.e., in water temperature
Lifting speed.
Water temperature rise speed T is higher than every 5s and rises T DEG C of Δ, and water temperature is more than T1, then temperature gradient control is carried out, is controlled
Device sends a control signal to radiator fan, increases radiating fan rotation speed, improves the heat-sinking capability of cooling system.
When monitoring control devices to engine water temperature are higher than T1When, high temperature sectional protection is enabled, temperature gradient control enables,
Controller carries out temperature gradient calculating, calculates the speed that water temperature rises, if practical temperature gradient is higher than setting temperature gradient,
Controller issues control signal, and control cooling system heat radiation power improves.
Cooling system heat-sinking capability is played by engine water temperature temperature value and temperature gradient co- controlling, wherein temperature gradient
The priority of control is high.When temperature gradient value does not reach setting temperature gradient, cooling system heat-sinking capability and water temperature
Value is related；When temperature gradient value reaches setting temperature gradient, it is corresponding that cooling system heat-sinking capability is greater than water temperature at this time
Heat-sinking capability, and temperature gradient value is bigger, and the heat-sinking capability that cooling system plays is bigger.
Engine speed reduces and the reduction of main pump power is asynchronous, progress main pump power reduction first, in main pump power
Be reduced to after certain value and carry out engine speed reduction again, the power and main pump power when preventing low engine speeds mismatch and
Caused by endanger.
During temperature gradient protection, the power of cooling system and engine, main pump power be by matching primitives,
Its primary condition is that cooling system power adds main pump power no more than engine power.Power is had reached the maximum in engine
In the case of, while cooling system power increases, to reduce main pump power, this power increase and reduction be certain time gradually
Become, is not mutation.
When temperature sensor test engine water temperature is lower than (T1- 20) when, controller issues control signal and controls radiation air
Revolving speed is fanned to minimum, when water temperature is in (T1- 20)-T1When, controller issues control signal control radiating fan rotation speed with water temperature liter
It is high and increase；When water temperature is higher than T2When, controller issues control signal control radiating fan rotation speed in highest.
A kind of digger engine high temperature sectional protective device, including temperature sensor, cooling system, controller and alarm
Device, the temperature sensor are placed in engine water tank, are used for test engine water temperature, and temperature sensor and controller input
End, which is connected and the engine water temperature data of test are transmitted to controller, to be handled, controller output end and engine, heat dissipation
System, alarm are connected with excavator main pump, for controlling engine speed, cooling system power and excavator main pump output work
Rate, by controller control alarm alarm, by controller carry out temperature gradient calculating, control temperature gradient control and
The opening and closing of high temperature emergency flight control.
Embodiment 1
A kind of digger engine high temperature sectional protective device, including temperature sensor, controller, cooling system (including heat dissipation
Fan), alarm, temperature gradient control and high temperature emergency flight control, temperature sensor be placed in engine water tank, for testing
Engine water temperature, temperature sensor be connected with controller input terminal and by the engine water temperature data of test be transmitted to controller into
Row processing, control output end is connected with engine, radiator fan, alarm and excavator main pump, for control engine speed,
Radiating fan rotation speed, excavator main pump output power, controller control alarm alarm, controller also with temperature gradient control
System is connected with high temperature emergency flight control, and controller is able to carry out temperature gradient calculating, the control of control temperature gradient and high temperature emergency control
High temperature sectional protection is realized in the opening and closing of system, and temperature controls between 90-105 DEG C, and controller controls radiation air by temperature gradient
The revolving speed of fan, rather than simple judged by temperature value；Conventional method is the corresponding rotation speed of the fan of a temperature, and this
In invention, temperature rises comparatively fast, then increases radiating fan rotation speed, this rotation speed of the fan revolving speed more corresponding than temperature at this time is big.Control
Device output end is also connect with the recirculated water cooling system of engine.
As shown in Figure 1, a kind of digger engine high temperature sectional guard method, including temperature gradient control and high temperature emergency
It controls, the temperature sensor in engine water tank handles engine water temperature real-Time Signal Transfer to controller, works as control
Device monitors that engine water temperature is higher than T1When, enable high temperature sectional protection, temperature gradient control at this time enables, and controller carries out
Temperature gradient calculates, if temperature gradient increases comparatively fast, increases cooling system output power, rather than until temperature rises to
Certain value increases cooling system power again, when water temperature is higher than T2, at this point, high temperature emergency flight control starts, controller issues signal, drop
Low engine speed to minimum or idling, reduce excavator main pump output power to minimum, be simultaneously emitted by alarm signal.
Temperature gradient calculating process are as follows:
Every 1s acquires an engine water temperature real-time temperature values, and the temperature value of rear one acquisition subtracts previous temperature value, is
This temperature gradient calculated；Continuous plus 5 times temperature gradient values are added up, average temperature rising gradient is obtained；By every 1s
The real-time temperature values of acquisition iterate to calculate, the average temperature rising gradient value changed over time, the judgement mark as temperature gradient
Standard, calculation formula are as follows:
In formula,For the engine water temperature real-time temperature values of n-th acquisition, T is (water temperature rising of averagely appreciating in every 5s water temperature
Speed), if water temperature rise speed T is higher than every 5s and rises 1 DEG C, and water temperature is more than T1Temperature gradient control is then carried out, is controlled
Device sends a control signal to radiator fan, increases radiating fan rotation speed, improves heat-sinking capability.
If engine water temperature is more than T2And continuing 10s, controller starts high temperature emergency flight control, reduces engine speed to most
Low or idling, while controller sends a control signal to excavator main pump reduces main pump output power to minimum, that is, reduces and start
Machine bearing power is to minimum；Controller starts to control signal to recirculated water cooling system simultaneously, and recirculated water cooling system is radiated
Ability maintains highest, and while the starting of high temperature emergency flight control, controller controls alarm and issues high temperature alarm signal.
The operation principle of the present invention is that:
When controller detects that engine water temperature is higher than T by temperature sensor1After (90 DEG C), temperature gradient control starting, control
Device processed carries out temperature gradient calculating, calculates the speed that water temperature rises, it is assumed that: water temperature is 92 DEG C in 0s, is in 5s
93.5℃；At 93.5 DEG C, the corresponding heat radiation power of cooling system is assumed to be 20kW, because temperature gradient reaches 1.5 DEG C, is more than
Temperature gradient (every 5s rises 1 DEG C) is set, then controller issues control signal, and control cooling system heat radiation power is increased to
25Kw；Assuming that engine has performed to maximum power 100kW, it is 80kW that main pump absorbed power originally, then because of heat dissipation system
System power improves, and main pump absorbs power and is reduced to 75kW.
When controller detects that engine water temperature is higher than T by temperature sensor2After (105 DEG C) and lasting 10s, high temperature is answered
Anxious control starting, controller issue control signal first, reduce main pump and absorb power, absorb power in main pump and are reduced to certain value
Afterwards, then engine speed is reduced to idling or minimum speed, reduce engine loading power, it is therefore an objective to prevent low engine speeds
When power and main pump power mismatch, cause further to endanger, meanwhile, controller driving alarm alarm.
The part that the present invention is not directed to is the prior art, and this will not be repeated here.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, several improvement and deformations can also be made, these improvement and deformations
Also it should be regarded as protection scope of the present invention.
Claims (9)
1. a kind of digger engine high temperature sectional guard method, it is characterised in that: the following steps are included: temperature sensor will be sent out
Motivation water temperature signal is transferred to controller, when water temperature is higher than T1When, temperature gradient control starting, controller carries out temperature gradient meter
It calculates, if exceeding the setting temperature gradient of controller, improves the heat-sinking capability of cooling system；When water temperature is higher than T2When, high temperature is answered
Anxious control enables, and controller issues signal, and reduction engine speed to idling or minimum speed reduce excavator main pump output work
Rate controls alarm and issues alarm signal to minimum.
2. a kind of digger engine high temperature sectional guard method according to claim 1, it is characterised in that: controller into
The process that row temperature gradient calculates are as follows: every 1s acquires an engine water temperature real-time temperature values, and the temperature value of rear one acquisition subtracts
Previous temperature value is removed, the temperature gradient calculated for this；Continuous plus 5 times temperature gradient values are added up, are obtained
Average temperature rising gradient；The real-time temperature values iterative calculation that every 1s is acquired, the average temperature rising gradient value changed over time are made
For the judgment criteria of temperature gradient, calculation formula are as follows:
In formula, TnFor the engine water temperature real-time temperature values of n-th acquisition, T is averagely to appreciate in every 5s water temperature, i.e., water temperature rises
Speed.
3. a kind of digger engine high temperature sectional guard method according to claim 2, it is characterised in that: water temperature rises
Speed T is higher than every 5s and rises T DEG C of Δ, and water temperature is more than T1, then temperature gradient control is carried out, controller is sent a control signal to
Radiator fan increases radiating fan rotation speed, improves the heat-sinking capability of cooling system.
4. a kind of digger engine high temperature sectional guard method according to claim 1, it is characterised in that: work as controller
Monitor that engine water temperature is higher than T1When, enable high temperature sectional protection, temperature gradient control enables, and controller carries out temperature rise ladder
Degree calculates, and calculates the speed that water temperature rises, it is assumed that: water temperature is 92 DEG C in 0s, is 93.5 DEG C in 5s；At 93.5 DEG C
When, the corresponding heat radiation power of cooling system is assumed to be 20kW, because temperature gradient reaches 1.5 DEG C, higher than the setting that every 5s rises 1 DEG C
Temperature gradient, controller issue control signal, and control cooling system heat radiation power improves.
5. a kind of digger engine high temperature sectional guard method according to claim 1, it is characterised in that: the heat dissipation
System radiating ability orientation is by engine water temperature temperature value and temperature gradient co- controlling, the priority that wherein temperature gradient controls
It is high.When temperature gradient value does not reach setting temperature gradient, cooling system heat-sinking capability is related to water temperature value；In temperature rise
When gradient value reaches setting temperature gradient, cooling system heat-sinking capability is greater than the corresponding heat-sinking capability of water temperature at this time, and
Temperature gradient value is bigger, and the heat-sinking capability that cooling system plays is bigger.
6. a kind of digger engine high temperature sectional guard method according to claim 1, it is characterised in that: described to start
Machine revolving speed reduce and main pump power reduction be it is asynchronous, first progress the reduction of main pump power, be reduced to certain value in main pump power
Carry out engine speed reduction again afterwards, the power and main pump power when preventing low engine speeds mismatch and caused by harm.
7. a kind of digger engine high temperature sectional guard method according to claim 1, it is characterised in that: in temperature rise ladder
During degree protection, the power and engine, main pump power of cooling system are by matching primitives, and primary condition is heat dissipation
System power adds main pump power no more than engine power.In the case where engine has reached the maximum power, cooling system
While power increases, to reduce main pump power, it is not mutation that it is in certain time gradual change that this power, which increases and reduces,
's.
8. a kind of digger engine high temperature sectional guard method according to claim 1, it is characterised in that: when temperature passes
Sensor test engine water temperature is lower than (T1- 20) when, controller issues control signal and controls radiating fan rotation speed to minimum, works as water
Temperature is in (T1-20)-T1When, controller issues control signal control radiating fan rotation speed and increases and increase with water temperature；When water temperature is higher than
T2When, controller issues control signal control radiating fan rotation speed in highest.
9. a kind of digger engine high temperature sectional protective device, it is characterised in that: including temperature sensor, cooling system, control
Device and alarm processed, the temperature sensor are placed in engine water tank, be used for test engine water temperature, temperature sensor with
Controller input terminal, which is connected and the engine water temperature data of test are transmitted to controller, to be handled, controller output end and hair
Motivation, cooling system, alarm are connected with excavator main pump, for controlling engine speed, cooling system power and excavator
Main pump output power, controls alarm by controller and alarms, and carries out temperature gradient calculating by controller, controls temperature rise
The opening and closing of gradient control and high temperature emergency flight control.
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| CN201910236214.1A CN109914522B (en) | 2019-03-27 | 2019-03-27 | High-temperature sectional protection method and device for excavator engine |
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| CN201910236214.1A CN109914522B (en) | 2019-03-27 | 2019-03-27 | High-temperature sectional protection method and device for excavator engine |
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| CN110735712A (en) * | 2019-11-07 | 2020-01-31 | 徐州众信矿业科技有限公司 | mining equipment engine temperature detection and adjustment device and method |
| CN110761896A (en) * | 2019-10-28 | 2020-02-07 | 徐州立方机电设备制造有限公司 | Method for preventing engine from being overhigh in temperature |
| CN115163305A (en) * | 2022-05-31 | 2022-10-11 | 河南柴油机重工有限责任公司 | Diesel engine crankcase pressure monitoring method |
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| Publication number | Publication date |
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| CN109914522B (en) | 2021-06-04 |
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