CN102061719B

CN102061719B - Excavator overheating protection method

Info

Publication number: CN102061719B
Application number: CN2010105810628A
Authority: CN
Inventors: 戴晴华; 汪春晖; 陈少春
Original assignee: Sany Heavy Machinery Ltd
Current assignee: Sany Heavy Machinery Ltd
Priority date: 2010-12-09
Filing date: 2010-12-09
Publication date: 2012-10-31
Anticipated expiration: 2030-12-09
Also published as: CN102061719A

Abstract

The invention dissolves an excavator overheating protection method is characterized by comprising the steps of: detecting water temperature of an engine by a temperature sensor of the engine, transmitting a signal to a controller by the temperature sensor when the water temperature is not less than 103 DEG C, receiving the signal by the controller and sending a signal to control the current of a main pump proportional valve, reducing the power of a main pump by 3 percent, enabling an excavator to continuously work when the temperature is not higher than 100 DEG C after regulation; if the temperature is still high after regulation, judging that the power of the main pump is reduced, and when the reduction reaches 15 percent, controlling the engine to be in an idling state by the controller; and when the reduction is not more than 15 percent, continuously reducing the power of the main power until the engine does not overheat. Int the invention, the temperature is detected by the temperature sensor and the signal is transmitted to the controller, the controller controls the reduction of the power of the main pump, therefore, the temperature of the engine is lowered and normal work is not influenced.

Description

A kind of excavator method for excessive heating protection

Technical field

The present invention relates to a kind of method for excessive heating protection, be specifically related to a kind of engine overheat guard method of excavator.

Background technology

Along with continuous progress in science and technology; In engineering fields such as building, water conservancies, all kinds of construction machineries begin to be used widely, such as excavator, crane, bulldozer or the like; The construction machinery that this type is used for engineering construction is referred to as engineering machinery, and is wherein especially more general with the use of excavator.Excavator mainly is made up of running gear, slewing equipment, driver's cabin, equipment and control (power) device; Its power set generally are to adopt Diesel engine as power set; Diesel engine is the internal combustion engine that adopts diesel oil to act as a fuel; Chemical energy in the fuel oil is converted into the mechanical energy that drives the vehicle action through burning fuel oil pusher dynamic air cylinder inner carrier as back and forth movement; It has the high advantage of the thermal efficiency, and power ratio is big and save diesel oil, thereby is applied in widely in the power set of excavator.

When excavator is worked under the summer high-temperature state; Often run into the situation of engine overheat, just more common in the torrid areas that temperature is higher, engine overheat causes engine scuffing easily; Cause motor to be damaged; And then influenced the runnability of excavator, and also can delay the duration, influence programming.The reason of the engine overheat of excavator mainly comprises following two kinds; A kind of is the reason of motor self, and another kind is the reason of load, when the operator runs into the situation of engine overheat; Generally all be through reducing himself rotating speed or reducing its load; Spray thereby reduce fuel oil, reduce calorific value, to reach the purpose that reduces the diesel engine temperature.But,, then can reduce operating efficiency if load is reduced too much; The rotating speed of motor is reduced; Can lower efficiency equally, thus when reducing load and rotating speed, need control again, when the temperature of motor is recovered within 100 ℃; Just should keep present load and rotating speed, in the hope of not influencing operate as normal to greatest extent.

From the above, how when reducing engine temperature, do not influence the operate as normal of excavator again, become in the industry urgency problem to be solved.

Summary of the invention

The object of the invention provides a kind of excavator method for excessive heating protection, uses this method, can when reducing engine temperature, not influence operate as normal again.

For achieving the above object; The technical scheme that the present invention adopts is: a kind of excavator method for excessive heating protection, and the temperature pick up detection of engine water temperature of motor is when water temperature is not less than 103 ℃; Temperature pick up is transferred to controller with signal; Controller receives signal and also sends signal controlling main pump proportioning valve electric current, and main pump power is descended 3%, adjustment back temperature be not more than 100 ℃ then excavator work on; Adjustment back temperature or high temperature are judged main pump power slippage, are in idling mode when slippage reaches 15% controller control motor, and to continue to reduce main pump power not overheated until motor when slippage is not more than 15%.

In the technique scheme, said motor is a Diesel engine, cooperates to be provided with temperature pick up, and said temperature pick up is to utilize the temperature variant rule of the various physical characteristics of material the sensor of temperature transition for electric weight.If the too high meeting of Diesel engine temperature causes the various faults that diminish diesel engine of degradation under motor pull bar, the power, thereby shorten service life of a machine, therefore, the control motor not high temperature be diesel engine utilization and supporting in very important work.The diesel engine temperature is too high, if owing to the reason of thermostat or water tank causes that if minor failure also can adopt the method that suitably reduces load to solve through the sensor of load, warning reminding needs repairing simultaneously; If this failure ratio is more serious, reducing by 15% load can't solve, and so just should shut down solution; The high temperature that causes owing to the excessive reason of load equally also can adopt this method, selects 15% as standard; Be because under 85% load, still can suitably carry out work, if low again; So just not necessarily can guarantee that machine has normally used, maximum purpose guarantees that still machine normally uses; Detect maintenance when waiting to shut down again, this allows in whole control process, has so just improved economic benefit greatly.

Because the technique scheme utilization, the present invention compared with prior art has advantage:

1. the present invention is through the temperature pick up detected temperatures; And signal passed to controller, controller descends according to signal controlling main pump power, if high temperature still after the adjustment; Then controlling main pump power drops to 15% motor and is in idling mode; If it is not overheated until motor that slippage continues to reduce main pump power less than 15%, the signal that gives the alarm simultaneously, thus when reducing engine temperature, do not influence operate as normal again.

Description of drawings

Fig. 1 is the flow chart of the embodiment of the invention one.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is further described:

Embodiment one: referring to shown in Figure 1; A kind of excavator method for excessive heating protection, the temperature pick up detection of engine water temperature of motor is when water temperature is not less than 103 ℃; Temperature pick up is transferred to controller with signal; Controller receives signal and also sends signal controlling main pump proportioning valve electric current, and main pump power is descended 3%, adjustment back temperature be not more than 100 ℃ then excavator work on; Adjustment back temperature or high temperature are judged main pump power slippage, are in idling mode when slippage reaches 15% controller control motor, and to continue to reduce main pump power not overheated until motor when slippage is not more than 15%.

When excavator was in normal use, in-engine temperature pick up was monitored engine water temperature in real time, and detection information is passed to the controller of excavator; When temperature pick up detects water temperature and is higher than 103 ℃; Temperature pick up passes to controller with this information, and controller receives information and handles, and sends the proportioning valve output current of signal controlling excavator main pump then; Thereby the power output of main pump is reduced by 3%; Through after the above-mentioned adjustment, temperature pick up continues the detection of engine water temperature, be not more than 100 ℃ words then excavator work on; If adjustment back temperature still is higher, controller is judged main pump power drop amount, and controller control motor makes it be in idling when slippage reaches 15%, and it is not overheated up to motor that 15% of slippage less than continues to reduce main pump power.

Claims

1. excavator method for excessive heating protection; It is characterized in that: the temperature pick up detection of engine water temperature of motor; When water temperature was not less than 103 ℃, temperature pick up was transferred to controller with signal, and controller receives signal and sends signal controlling main pump proportioning valve electric current; Main pump power is descended 3%, adjustment back temperature be not more than 100 ℃ then excavator work on; Adjustment back temperature is judged main pump power slippage still greater than 100 ℃, is in idling mode when slippage reaches 15% controller control motor, and to continue to reduce main pump power not overheated until motor when slippage is not more than 15%.