阅读说明：本技术 一种工程机械电动液压油散热器的控制系统及控制方法 (Control system and control method for electric hydraulic oil radiator of engineering machinery ) 是由 柳坤 陶臣汉 王充 王海涛 白晓军 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种工程机械电动液压油散热器的控制系统及控制方法,控制系统包括有控制单元,分别与控制单元连接的发动机电子控制单元、设置于电动液压油散热器液压油入口处的温度开关、散热器控制开关和继电器,以及连接于发动机电子控制单元上的发动机凸轮轴转速传感器；电动液压油散热器的驱动电机通过继电器与供电电源连接。本发明结合工程机械发动机的运转情况、散热器控制开关和温度开关的状态自动控制电动液压油散热器,防止发动机停止后,忘记关闭液压油散热器,造成蓄电池亏电的问题；本发明控制系统结构简单,不需要增加额外的组件和成本,且控制自动化程度高。(The invention discloses a control system and a control method of an electric hydraulic oil radiator of engineering machinery, wherein the control system comprises a control unit, an engine electronic control unit, a temperature switch, a radiator control switch and a relay, wherein the engine electronic control unit is respectively connected with the control unit; and a driving motor of the electric hydraulic oil radiator is connected with a power supply through a relay. The electric hydraulic oil radiator is automatically controlled by combining the running condition of the engine of the engineering machinery and the states of the radiator control switch and the temperature switch, so that the problem of power shortage of the storage battery caused by forgetting to close the hydraulic oil radiator after the engine stops is solved; the control system has simple structure, does not need to add extra components and cost, and has high control automation degree.)

1. The utility model provides a control system of electronic hydraulic oil radiator of engineering machine tool which characterized in that: the device comprises a control unit, an engine electronic control unit, a temperature switch, a radiator control switch and a relay, wherein the engine electronic control unit is respectively connected with the control unit; and the driving motor of the electric hydraulic oil radiator is connected with a power supply through a relay.

2. The control system of the electric hydraulic oil radiator of the engineering machinery as claimed in claim 1, wherein: and the engine electronic control unit is connected with the control unit through a CAN bus.

3. The control method of the control system of the engineering machinery electric hydraulic oil radiator according to claim 1, characterized in that: the method specifically comprises the following steps: the method comprises the steps that firstly, an electronic engine control unit collects real-time rotating speed information of an engine through a rotating speed sensor of a camshaft of the engine, then the real-time rotating speed information is sent to a control unit, when the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine, the control unit collects switching value information of a temperature switch and a radiator control switch, when the temperature switch and the radiator control switch are both in a closed state, the control unit controls a relay to be closed, and at the moment, a driving motor of an electric hydraulic oil radiator is electrified and started.

4. The control method according to claim 3, characterized in that: when the real-time rotating speed of the engine is less than the lowest working rotating speed set by the engine, the control unit controls the relay to be disconnected, and the electric hydraulic oil radiator stops radiating work.

5. The control method according to claim 3, characterized in that: when the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine, the control unit acquires switching value information of the temperature switch and the radiator control switch, and when any one of the temperature switch and the radiator control switch is in a disconnected state, the control unit controls the relay to be disconnected, and the electric hydraulic oil radiator stops radiating.

6. The control method according to claim 3, characterized in that: when the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine, the control unit acquires switching value information of the temperature switch and the radiator control switch, and when the temperature switch and the radiator control switch are both in an off state, the control unit controls the relay to be switched off, and the electric hydraulic oil radiator stops radiating.

7. The control method according to claim 3, characterized in that: and when the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine and the duration time is not less than the set time, the control unit acquires the switching value information of the temperature switch and the radiator control switch.

Technical Field

The invention relates to the field of hydraulic oil radiators, in particular to a control system and a control method for an electric hydraulic oil radiator of engineering machinery.

Background

The hydraulic oil radiator is used in engineering machinery using hydraulic oil as a force transmission medium, such as: excavators, concrete delivery pumps, fine mortar pumps, boom pumps, truck mounted pumps, pile drivers, trenchers, rotary drilling rigs, pavers, trenchless equipment, air compressors, road rollers, and the like. When the hydraulic system works, high-temperature oil in the hydraulic system flows through the hydraulic oil radiator, and high-efficiency heat exchange is carried out between the high-temperature oil and cold air which forcibly flows in the hydraulic oil radiator, so that the oil temperature is reduced to the working temperature to ensure that a main machine can continuously and normally run, and the work can be smoothly carried out.

The control method of the existing engineering machinery hydraulic oil radiator comprises the steps that firstly, a radiator control switch is used for controlling a relay to directly switch on or switch off a power supply of the hydraulic oil radiator, so that the starting and the stopping of the hydraulic oil radiator are controlled; the other method is to install a temperature switch at the hydraulic oil inlet of the hydraulic oil radiator and control the automatic start and stop of the hydraulic oil radiator according to the temperature of the hydraulic oil.

The defects are as follows: 1. after the engineering machinery is electrified, if a control switch of the hydraulic oil radiator is forgotten to be turned off or the temperature of hydraulic oil is too high, the hydraulic oil radiator can be directly started, so that the use of the whole vehicle electric appliance and the hydraulic oil radiator is not facilitated; 2. if the engine is flamed out, the engineering machinery is continuously electrified, and the control switch of the hydraulic oil radiator is forgotten to be turned off or the temperature of the hydraulic oil is too high, the hydraulic oil radiator is always in a working state, the electric quantity of the storage battery is greatly consumed if the time is too long, the storage battery is in power shortage, and the engine cannot be started when the engine of the engineering machinery is started next time.

Disclosure of Invention

The invention aims to provide a control system and a control method for an electric hydraulic oil radiator of engineering machinery, which automatically control the electric hydraulic oil radiator by combining the running condition of an engine of the engineering machinery and the states of a radiator control switch and a temperature switch, so as to avoid the problem of power shortage of a storage battery.

The technical scheme of the invention is as follows:

a control system of an electric hydraulic oil radiator of engineering machinery comprises a control unit, an engine electronic control unit, a temperature switch, a radiator control switch and a relay, wherein the engine electronic control unit is respectively connected with the control unit; and the driving motor of the electric hydraulic oil radiator is connected with a power supply through a relay.

And the engine electronic control unit is connected with the control unit through a CAN bus.

A control method for an electric hydraulic oil radiator of engineering machinery specifically comprises the following steps: the method comprises the steps that firstly, an electronic engine control unit collects real-time rotating speed information of an engine through a rotating speed sensor of a camshaft of the engine, then the real-time rotating speed information is sent to a control unit, when the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine, the control unit collects switching value information of a temperature switch and a radiator control switch, when the temperature switch and the radiator control switch are both in a closed state, the control unit controls a relay to be closed, and at the moment, a driving motor of an electric hydraulic oil radiator is electrified and started.

When the real-time rotating speed of the engine is less than the lowest working rotating speed set by the engine, the control unit controls the relay to be disconnected, and the electric hydraulic oil radiator stops radiating work.

When the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine, the control unit acquires switching value information of the temperature switch and the radiator control switch, and when any one of the temperature switch and the radiator control switch is in a disconnected state, the control unit controls the relay to be disconnected, and the electric hydraulic oil radiator stops radiating.

When the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine, the control unit acquires switching value information of the temperature switch and the radiator control switch, and when the temperature switch and the radiator control switch are both in an off state, the control unit controls the relay to be switched off, and the electric hydraulic oil radiator stops radiating.

And when the real-time rotating speed of the engine is not less than the set lowest working rotating speed of the engine and the duration time is not less than the set time, the control unit acquires the switching value information of the temperature switch and the radiator control switch.

The invention has the advantages that:

the electric hydraulic oil radiator is automatically controlled by combining the running condition of the engine of the engineering machinery and the states of the radiator control switch and the temperature switch, so that the problem of power shortage of the storage battery caused by forgetting to close the hydraulic oil radiator after the engine stops is solved; the control system has simple structure, does not need to add extra components and cost, and has high control automation degree.

Drawings

Fig. 1 is a schematic structural diagram of the control system of the present invention, wherein "- -" represents a signal link and "- -" represents a power supply link.

Fig. 2 is a flow chart of the control method of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1, a control system of an electric hydraulic oil radiator of an engineering machine comprises a control unit 1, an engine electronic control unit (engine ECU)3 respectively connected with the control unit 1, a temperature switch 4, a radiator control switch 5 and a relay 6 arranged at a hydraulic oil inlet of the electric hydraulic oil radiator, and an engine camshaft rotation speed sensor 7 connected to the engine ECU 3; the engine electronic control unit 3 is connected with the control unit 1 through the CAN bus 2, and the driving motor 8 of the electric hydraulic oil radiator is connected with the power supply 9 through the relay 6.

Referring to fig. 2, a method for controlling an electric hydraulic oil radiator of an engineering machine specifically includes the following steps:

(1) firstly, an engine ECU 3 acquires real-time rotating speed information of an engine through an engine camshaft rotating speed sensor 7 and then sends the information to a control unit 1 through a CAN bus 2;

(2) when the real-time rotating speed of the engine is not less than the minimum working rotating speed (500rpm) set by the engine and the duration time is not less than the set time (2s), then the control unit 1 acquires switching value information of the temperature switch 4 and the radiator control switch 5, when the temperature switch 4 and the radiator control switch 5 are both in a closed state, the control unit 1 controls the relay 6 to be closed, and at the moment, the driving motor 8 of the electric hydraulic oil radiator is powered on and started to carry out heat dissipation work;

(3) and when the real-time rotating speed of the engine is less than the set lowest working rotating speed (500rpm) of the engine, the control unit 1 controls the relay 6 to be switched off, and the electric hydraulic oil radiator stops radiating work.

(4) When the real-time rotating speed of the engine is not less than the minimum working rotating speed (500rpm) set by the engine and the duration time is not less than the set time (2s), then the control unit 1 acquires the switching value information of the temperature switch 4 and the radiator control switch 5, when any one of the temperature switch 4 and the radiator control switch 5 is in an off state, the control unit 1 controls the relay 6 to be switched off, and the electric hydraulic oil radiator stops the heat dissipation work.

(5) When the real-time rotating speed of the engine is not less than the minimum working rotating speed (500rpm) set by the engine and the duration time is not less than the set time (2s), then the control unit 1 acquires the switching value information of the temperature switch 4 and the radiator control switch 5, and when the temperature switch 4 and the radiator control switch 5 are both in the off state, the control unit 1 controls the relay 6 to be switched off, and the electric hydraulic oil radiator stops the heat dissipation work.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.