A control system and control method for an electric hydraulic oil radiator of an engineering machinery

Abstract

The present invention discloses a control system and control method for an electric hydraulic oil radiator of engineering machinery. The control system includes a control unit, an engine electronic control unit connected to the control unit, a temperature switch, a radiator control switch and a relay arranged at the hydraulic oil inlet of the electric hydraulic oil radiator, and an engine camshaft speed sensor connected to the engine electronic control unit; the driving motor of the electric hydraulic oil radiator is connected to the power supply through a relay. The present invention automatically controls the electric hydraulic oil radiator in combination with the operation of the engineering machinery engine, the state of the radiator control switch and the temperature switch to prevent the problem of forgetting to close the hydraulic oil radiator after the engine stops, causing the battery to run out of power; the control system of the present invention has a simple structure, does not require the addition of additional components and costs, and has a high degree of control automation.

Description

Technical Field

[0001] The invention relates to the field of hydraulic oil radiators, and in particular to a control system and a control method for an electric hydraulic oil radiator of an engineering machinery. Background Art

[0002] Hydraulic oil radiators are used in engineering machinery that use hydraulic oil as a force transmission medium, such as: excavators, concrete pumps, fine mortar pumps, boom pumps, vehicle-mounted pumps, pile drivers, trenchers, rotary drilling rigs, pavers, trenchless equipment, air compressors, road rollers, etc. During operation, the high-temperature oil in the hydraulic system flows through the hydraulic oil radiator, where it undergoes efficient heat exchange with the forced-flowing cold air, reducing the oil temperature to the operating temperature to ensure that the host can continue to operate normally and that the work can proceed smoothly.

[0003] The existing control methods for hydraulic oil radiators of construction machinery include: one is to directly connect or disconnect the power supply of the hydraulic oil radiator through the radiator control switch to control the relay, thereby controlling the start and stop of the hydraulic oil radiator; the other method is to install a temperature switch at the hydraulic oil inlet of the hydraulic oil radiator to control the automatic start and stop of the hydraulic oil radiator according to the temperature of the hydraulic oil.

[0004] The defects are: 1. After the engineering machinery is powered on, if the hydraulic oil radiator control switch is forgotten to be turned off or the hydraulic oil temperature is too high, the hydraulic oil radiator will start directly, which is not conducive to the use of the vehicle electrical appliances and the hydraulic oil radiator; 2. If the engine is turned off and the engineering machinery continues to be powered on, and the hydraulic oil radiator control switch is forgotten to be turned off or the hydraulic oil temperature is too high, the hydraulic oil radiator will always be in working state. If it lasts for too long, it will consume a lot of battery power, causing the battery to be exhausted. The next time the engine of the engineering machinery is started, the engine cannot be started. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a control system and a control method for an electric hydraulic oil radiator of engineering machinery, which automatically controls the electric hydraulic oil radiator in combination with the operating conditions of the engineering machinery engine, the status of the radiator control switch and the temperature switch, to avoid the problem of battery power loss.

[0006] The technical solution of the present invention is:

[0007] A control system for an electric hydraulic oil radiator of engineering machinery includes a control unit, an engine electronic control unit respectively connected to the control unit, a temperature switch arranged at the hydraulic oil inlet of the electric hydraulic oil radiator, a radiator control switch and a relay, and an engine camshaft speed sensor connected to the engine electronic control unit; the drive motor of the electric hydraulic oil radiator is connected to a power supply through a relay.

[0008] The engine electronic control unit is connected to the control unit via a CAN bus.

[0009] A control method for an electric hydraulic oil radiator of engineering machinery specifically includes the following steps: first, an engine electronic control unit collects real-time engine speed information through an engine camshaft speed sensor, and then sends it to a control unit; when the real-time engine speed is not less than the minimum operating speed set for the engine, the control unit then collects switch quantity 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 close, and at this time a drive motor of the electric hydraulic oil radiator is powered on and started to perform heat dissipation.

[0010] When the real-time engine speed is less than the lowest operating speed set for the engine, the control unit controls the relay to disconnect, and the electric hydraulic oil radiator stops the heat dissipation work.

[0011] When the real-time speed of the engine is not less than the minimum operating speed set for the engine, the control unit then collects the switch quantity information of the temperature switch and the radiator control switch. When either the temperature switch or the radiator control switch is in the disconnected state, the control unit controls the relay to disconnect, and the electric hydraulic oil radiator stops cooling.

[0012] When the real-time speed of the engine is not less than the minimum operating speed set for the engine, the control unit then collects the switching information of the temperature switch and the radiator control switch. When the temperature switch and the radiator control switch are both in the disconnected state, the control unit controls the relay to disconnect, and the electric hydraulic oil radiator stops cooling.

[0013] When the real-time engine speed is not less than the set minimum operating speed of the engine and the duration is not less than the set time, the control unit then collects the switch quantity information of the temperature switch and the radiator control switch.

[0014] Advantages of the present invention:

[0015] The present invention automatically controls the electric hydraulic oil radiator in combination with the operating conditions of the engineering machinery engine, the states of the radiator control switch and the temperature switch, to prevent the problem of battery power loss caused by forgetting to close the hydraulic oil radiator after the engine stops. The control system of the present invention has a simple structure, does not require the addition of additional components and costs, and has a high degree of control automation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the structure of the control system of the present invention, wherein “——” represents a signal link and “---” represents a power supply link.

[0017] Figure 2It is a flow chart of the control method of the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See Figure 1 A control system for an electric hydraulic oil radiator of construction machinery includes a control unit 1, an engine electronic control unit (engine ECU) 3 connected to the control unit 1, a temperature switch 4 arranged at the hydraulic oil inlet of the electric hydraulic oil radiator, a radiator control switch 5 and a relay 6, and an engine camshaft speed sensor 7 connected to the engine electronic control unit 3; wherein the engine electronic control unit 3 is connected to the control unit 1 through a CAN bus 2, and a drive motor 8 of the electric hydraulic oil radiator is connected to a power supply 9 through a relay 6.

[0020] See Figure 2 , a control method for an electric hydraulic oil radiator of an engineering machinery, specifically comprising the following steps:

[0021] (1) First, the engine ECU 3 collects the real-time engine speed information through the engine camshaft speed sensor 7, and then sends it to the control unit 1 through the CAN bus 2;

[0022] (2) When the real-time engine speed is not less than the minimum operating speed set for the engine (500 rpm) and the duration is not less than the set time (2 s), the control unit 1 then collects the switch quantity 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 the closed state, the control unit 1 controls the relay 6 to close, and at this time the drive motor 8 of the electric hydraulic oil radiator is powered on to start the heat dissipation work;

[0023] (3) When the real-time engine speed is less than the minimum operating speed set for the engine (500 rpm), the control unit 1 controls the relay 6 to be disconnected, and the electric hydraulic oil radiator stops cooling.

[0024] (4) When the real-time engine speed is not less than the set minimum operating speed of the engine (500 rpm) and the duration is not less than the set time (2s), the control unit 1 collects the switch quantity information of the temperature switch 4 and the radiator control switch 5. When any switch of the temperature switch 4 and the radiator control switch 5 is in the off state, the control unit 1 controls the relay 6 to disconnect, and the electric hydraulic oil radiator stops the heat dissipation work.

[0025] (5) When the real-time engine speed is ≥ or greater than the engine's set minimum operating speed (500 rpm) and the duration is not less than the set time (2 s), the control unit 1 collects the switch quantity 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 the disconnected state, the control unit 1 controls the relay 6 to disconnect, and the electric hydraulic oil radiator stops the heat dissipation work.

[0026] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control method for a control system of an electric hydraulic oil radiator of an engineering machinery, characterized in that: The control system includes a control unit, an engine electronic control unit connected to the control unit, a temperature switch, a radiator control switch and a relay arranged at the hydraulic oil inlet of the electric hydraulic oil radiator, and an engine camshaft speed sensor connected to the engine electronic control unit; the driving motor of the dynamic hydraulic oil radiator is connected to the power supply through a relay; The control method specifically includes the following steps: first, the engine electronic control unit collects the real-time engine speed information through the engine camshaft speed sensor, and then sends it to the control unit. When the real-time engine speed is not less than the minimum operating speed set for the engine, the control unit then collects the switch quantity information of the temperature switch and the radiator control switch. When the temperature switch and the radiator control switch are both in the closed state, the control unit controls the relay to close, and at this time the drive motor of the electric hydraulic oil radiator is powered on and started to perform heat dissipation.

2. The control method according to claim 1, characterized in that: The engine electronic control unit is connected to the control unit via a CAN bus.

3. The control method according to claim 1, characterized in that: When the real-time engine speed is less than the lowest operating speed set for the engine, the control unit controls the relay to disconnect, and the electric hydraulic oil radiator stops the heat dissipation work.

4. The control method according to claim 1, characterized in that: When the real-time speed of the engine is not less than the minimum operating speed set for the engine, the control unit then collects the switch quantity information of the temperature switch and the radiator control switch. When either the temperature switch or the radiator control switch is in the disconnected state, the control unit controls the relay to disconnect, and the electric hydraulic oil radiator stops cooling.

5. The control method according to claim 1, characterized in that: When the real-time speed of the engine is not less than the minimum operating speed set for the engine, the control unit then collects the switching information of the temperature switch and the radiator control switch. When the temperature switch and the radiator control switch are both in the disconnected state, the control unit controls the relay to disconnect, and the electric hydraulic oil radiator stops cooling.

6. The control method according to claim 1, characterized in that: When the real-time engine speed is not less than the set minimum operating speed of the engine and the duration is not less than the set time, the control unit then collects the switch quantity information of the temperature switch and the radiator control switch.

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