CN108086391A

CN108086391A - A kind of crawler hypraulic excavator electric control system

Info

Publication number: CN108086391A
Application number: CN201611029481.4A
Authority: CN
Inventors: 马驰
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-11-22
Filing date: 2016-11-22
Publication date: 2018-05-29

Abstract

A kind of crawler hypraulic excavator electric control system; employ CAN bus type electric control system; devise anti-electric impulse circuit; effectively prevent excavator from generating electrion pulse in shutdown moment; protect the electric component in system; engine start control loop is devised, is effectively protected starter motor and oil cut-off valve, efficiently solves the phenomenon that artificial wiring error burns oil cut-off valve.For the system by the rational design to electric cabinet, the ordinary maintenance for making electrical system is more convenient, effectively prevents rainy day electric cabinet water inlet phenomenon, the outlet for making electric cabinet is beautiful, and connection is reliable.

Description

A kind of crawler hypraulic excavator electric control system

Technical field

The present invention relates to a kind of crawler hypraulic excavator electric control system, suitable for machinery field.

Background technology

Crawler hypraulic excavator is the main construction machinery of earth work since operating flexibility, scope of activities are big, China The country of hydraulic excavator market maximum is progressively become, the sales volume of 2010 surpasses 16.5 ten thousand, and excavator has become each main engine plants Profit increases one of product most certainly.

Crawler hypraulic excavator is mainly made of electric control system, dynamical system, three major part of mechanical system, wherein Electric control system is the core link of human-computer interaction and the central nervous system of vehicle, its direct shadow of design rationality The navigability, energy saving, reliability and maintainability of excavator are rung.It is few to the report of excavator global design at present, Big multipair control system or vehicle circuitry system introduction.

The content of the invention

The present invention proposes a kind of crawler hypraulic excavator electric control system, employs CAN bus type electrical control System, devises anti-electric impulse circuit, effectively prevents excavator from generating electrion pulse in shutdown moment, protects in system Electric component, devise engine start control loop, be effectively protected starter motor and oil cut-off valve, efficiently solve people The phenomenon that oil cut-off valve being burnt for wiring error.

The technical solution adopted in the present invention is：

In the electric control system, except conventional illumination, windscreen wiper, audio-visual, air-conditioning and engine start and stop etc. use conventional line Beam connection is outer, and collecting sensor signal, the power match of engine and proportioning pump, the valve control of hydraulic system are all complete by controller Into measuring instrument is all coupled with information management module by CAN bus with controller.

The anti-electric impulse circuit of the Design of Electrical Controling System effectively prevents excavator from generating height in shutdown moment and pressing Electric pulse protects the electric component in system.

Design of Electrical Controling System engine start control loop, is effectively protected starter motor and oil-break Valve efficiently solves the phenomenon that artificial wiring error burns oil cut-off valve.

The beneficial effects of the invention are as follows：The system makes the ordinary maintenance of electrical system by the rational design to electric cabinet It is more convenient, rainy day electric cabinet water inlet phenomenon is effectively prevented, the outlet for making electric cabinet is beautiful, and connection is reliable.

Description of the drawings

Fig. 1 is the Electric Control System of Electric Shovel block diagram based on CAN bus of the present invention.

Fig. 2 is the part electric control loop schematic diagram of the excavator of the present invention.

Specific embodiment

The invention will be further described with reference to the accompanying drawings and examples.

Such as Fig. 1, in bus-type electric control system, except conventional illumination, windscreen wiper, audio-visual, air-conditioning and engine open , the valve control of collecting sensor signal, the power match of engine and proportioning pump, hydraulic system outer using conventional harness connection such as stop System is all completed by controller, and measuring instrument is all coupled with information management module by CAN bus with controller.Measuring instrument Only the CAN message of controller passback is parsed and shown, is issued after data packing is carried out to button operation by CAN bus To controller, by controller to being performed after command analysis.Therefore connected between system using after bus-type control system, can effectively reducing The complexity connect, as long as the sensor and actuator on excavator are substantially connected on controller, between instrument and controller As long as being connected by 3 CAN bus, significantly reduce the line of driver's cabin.And due to electrically-controlled valve, actuator, sensor etc. All unified to be controlled and nursed one's health by controller, such controller can carry out short-circuit protection to each output, open circuit detects, and institute Input, output information can focus on, and fault message can be sent directly to instrument and shown, failure is examined It is disconnected more convenient and effective.Major defect is the high concentration due to system, as long as controller is problematic, will influence the work of complete machine Make.Sometimes for service kits such as CAN analyzers during trouble hunting.

Such as Fig. 2, in entire electric control system, due to work(such as controller, measuring instrument, information management system and air-conditionings Energy module is mainly using existing product, as long as the design of electric loop carries out setting juice according to the requirement of specific product.Herein Major design prevents the startup of electrical impulse circuit and engine, fuel cut-off control circuit.

The design of anti-electric impulse circuit mainly consider shutdown or start-up course in, make accumulator do not depart from electric power system so as to Play the role of filtering shock pulse.In excavator off working state, mainly powered by accumulator to electrical system, work as excavation When machine is in running order, generator powered that electrical system is mainly carried by diesel engine, while charge to accumulator. In system, accumulator plays the role of energy buffer peak load shifting, that is to say, that the abnormal high pressure that its energy absorption system generates, Electrical equipment in protection system.According to actual measurement, some excavators are in the moment for starting or shutting down, if K1 relays It disconnects too early, accumulator is made to depart from electric loop, then the voltage in system reaches 175V or so sometimes, this voltage is much More than system nominal voltage 24V, abnormal high pressure generate the main reason for be that big inductance element such as starts motor, generator in system Deng under power-off feelings rh suddenly, since electric current cannot be mutated generation high pressure.Therefore the core concept of anti-electric impulse circuit design is As long as shirt is started to operate pah, accumulator would not allow for depart from electrical system, be introduced primarily into relay K2 herein to realize This function is shut down moment in excavator, and K1 relay electric-loss disconnects, but due to the inertia of engine, will also be transported with generator Turn, generator R ends continue to output voltage, and K2 keeps attracting state, and accumulator still has contact to be kept with electrical system by K2 Connection filters out the abnormal voltage fluctuation generated due to shutdown moment, is only less than certain value, generator R ends electricity to engine speed Until pressure is not enough to keep K2 actuations, but this transitory process shut down at this time has been completed.

The main control for considering to start overlong time of the control of digger engine and oil cut-off valve are inhaled end and are terminated with keeping soon The protection of inverse time.In engine starting process, it is electric that the first step first obtains oil cut-off valve, and engine starts fuel feeding, and second step starts horse Up to operating, engine crankshaft operating is driven only to start to work to engine, the 3rd step is disconnected when engine is started to work to be started Motor couples with engine, and in this process, main control object is starter motor and oil cut-off valve, according to actual survey Amount, for the electromagnetic switch D.C. resistance of starter motor in 2 ohms, the fast end resistance of inhaling of oil cut-off valve keeps end for 2 ohms Resistance is 54 ohms.Therefore the engine start circuit major control target that we design has 3：1) oil cut-off valve is inhaled soon End, oil cut-off valve keep end, starter motor that must establish beginning startup engine by cable simultaneously, and starter motor is disconnected immediately after engine start, Simultaneously switch off oil cut-off valve and inhale end soon, but oil cut-off valve keep end will during engine works always it is electric;2) due to starter motor Electromagnetic switch and oil cut-off valve inhale end resistance very little soon, most long stream time is no more than 30 seconds;3) since oil cut-off valve is inhaled soon End and end is kept very close to can be effectively protected in the case of wiring error.

For the engine start circuit of above 3 points designs, key switch goes to start bit and postpones, under normal circumstances, System gives starter motor to power by K11, K3, by K11, K3, K12 disconnected i'} valves is given to inhale end soon and powered, by K11, K13, K14 keeps end power supply to oil cut-off valve, and engine enters startup stage, after engine start, generator R ends output 14V or so Voltage disconnects K3, while K12 is also disconnected, and starter motor and oil cut-off valve is made to inhale end dead electricity soon, and then key switch returns to ACC Position, K13 are disconnected, but due to the self-locking of K14 relays, oil cut-off valve keeps end to remain on power supply.After more than 30 seconds, start Machine is still starting successfully, then controller by detect key switch startup position time more than 30 seconds after, it is vertical K11 is disconnected, so as to terminate start-up course, prevents from burning out startup motor and oil cut-off valve.It slips up when due to wiring, misconnection oil-break The fast of valve inhales end and keeps end, then since the fuze current control of F3 is in 5A or so, and the electric current for inhaling end soon is up to l0A More than, therefore F3 is burnt, and plays the effect of protection oil cut-off valve.

Claims

1. a kind of crawler hypraulic excavator electric control system, it is characterized in that：In the electric control system, except routine Illumination, windscreen wiper, audio-visual, air-conditioning and engine start and stop etc. are outer using conventional harness connection, collecting sensor signal, engine with than The valve control of the power match, hydraulic system of example pump is all completed by controller, and measuring instrument and information management module all pass through CAN Bus is coupled with controller.

2. a kind of crawler hypraulic excavator electric control system according to claim 1, it is characterized in that：The electric-controlled The anti-electric impulse circuit of system design processed effectively prevents excavator from generating electrion pulse in shutdown moment, protects system In electric component.

3. a kind of crawler hypraulic excavator electric control system according to claim 1, it is characterized in that：The electric-controlled System design processed engine start control loop, is effectively protected starter motor and oil cut-off valve, efficiently solves and artificially connect The phenomenon that line mistake burns oil cut-off valve.