JPH01263323A - Control device for construction machine - Google Patents

Abstract

PURPOSE:To facilitate maintenance and to improve economical efficiency, by a method wherein a subcontroller to process an input signal from an input control part is connected to a main controller to receive the input signal and control an electric hydraulic converting part through serial communication. CONSTITUTION:A signal from an input control part 1 is received by a subcontroller 4A to process the input signal. A subcontroller 4A is coupled to a main controller 4B through bidirectional serial communication 8, and inputs signal from a machine body sensor 2 and a console 3. Given computation and logic decision are effected to an electric hydraulic converting part, e.g., a control valve 5, a pump 6, a running motor 7. This constitution eliminates the use of an expansive microcomputer, enables standardization of the subcontroller 4A, and permits local limitation of an influence exercised on a whole during failure in operation.

Description

[Detailed description of the invention] (Industrial application field) The present invention relates to a control device for construction machinery.

(Prior Art) The recent spread of electronic control has been remarkable, and construction machinery is no exception. For example, Figure 2 is an example of a block diagram of the electronic control part of a power shovel.
An operator (input operator) 1 that performs input to perform work, a sensor (11! Body sensor M) 2 that is installed in the aircraft and collects various information related to control, and a console that displays operating information etc. 3, and a controller 4 that inputs these signals, performs calculations and logical judgments, and outputs command signals.
The control system is composed of electro-hydraulic converters C to 7 that convert this command signal into a hydraulic signal, and hydraulic actuators (control valves, pumps, travel motors, etc.) that are driven by the converted hydraulic signals. Here, various controls are centrally performed by a controller 4 consisting of a microcomputer.

(Problem to be Solved by the Invention) However, in such a centralized control system, the burden on one controller 4 is large, so when various functions are added in response to demand and the system becomes complicated,
Inexpensive micro combination 1. -It will be difficult to respond in the evening. Furthermore, if the system is to be compatible with a complex system, it may not be possible to share the system if the vehicle type or class is different, and in that case, the benefits of the system cannot be enjoyed.

Furthermore, if a failure occurs in the controller 4, it affects the entire system, so even a minor failure may cause the system to become inoperable.

The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a device in which a sub-controller is responsible for processing signals from an input controller. .

(Means for Solving the Problems) The present invention includes a controller that inputs signals from an input operating device and a body sensor, performs calculations and logical judgments, and outputs a command signal, and an electric controller that converts the command signal into a hydraulic signal. In a control device for construction machinery that includes a hydraulic converter and a hydraulic actuator (control valve, pump, etc.) driven by the converted hydraulic signal, the functions of the controller are input in response to a signal from an input operating device. The system was divided into a sub-controller that processes signals and a controller (main controller) that receives signals from the sub-controller and controls the electro-hydraulic converter, and both controllers are connected via serial communication.

(Function) According to the present invention, control of construction machinery is divided into two controllers, so even if the control system becomes complicated, one
The burden placed on each controller is light, and even if a failure occurs, if one of the controllers is not affected, operation may not be affected. In addition, the operation with the input operation device is similar to Construction 8! If it is common to all machines, subcontrollers can be standardized.

Furthermore, according to serial communication, two terminals are required for input/output.
A book will do.

(Example) FIG. 1 is a bronch diagram of an electronic control part of a power shovel, and is shown in correspondence with FIG. 2. In FIG. 1, two controllers (a sub-controller 4A and a main controller 4B) perform the functions performed by the conventional controller 4.
).

Of these, the sub-controller 4A inputs signals from the input controller 1 and performs calculations and logical judgments.
Provided near the input operation device 1. In line with this, the main controller 4Bl, which is installed at the same location as before, receives signals from the aircraft sensor 2 and console 3, directly controls each electro-hydraulic converter 5 to 7, and also sends signals from the sub-controller 4A. Together with the received information, an electric signal is output to each electro-hydraulic converter 5 to 7 and the console 3.

Both controllers 4. Both A and 4B are constructed of microcomputers that perform digital control, and information is exchanged between them through bidirectional serial communication 8 that connects them. Here, serial communication 8 refers to one of the data processing formats, in which data is in a vertical format and only one bit can be transferred at a time. Also, the reason why it is bidirectional is that if necessary, the main controller 4B
This is to send data from the subcontroller 4A to the subcontroller 4A.

With this configuration, control is divided into two phases, so
Even if the control system becomes complex, the burden borne by one controller can be reduced, so even an inexpensive microcomputer can be applied to a complex system.

In addition, by dividing the functions, for example, even if the subcontroller 4A fails, if the main controller 4B is equipped with a protection circuit, the vehicle can continue to run, thereby reducing the impact on the entire system due to the failure. You can get rid of it by making it smaller.

Furthermore, the operation with the input operation device 1 is not limited to power excavators, but is similar to construction 8! If it is common to all machines, the sub-controller 4A can be standardized, resulting in advantages such as increased compatibility.

Serial communication 8 requires only two terminals (transmission lines) for input/output to process any number of bits (even one is possible if used for input/output), eliminating the need for long wiring or data transmission. . Moreover, by providing the sub-controller 4A near the input operation device 1, there is no need to connect many wires from the input operation device 1 to a far-distant controller as in the conventional case. The electrical wiring up to 4A can be significantly shortened, which not only simplifies the wiring system, but also reduces the influence of the environment such as heat and stress on the wiring.

(Effects of the Invention) As explained above, the present invention includes a controller that inputs signals from an input operating device and an aircraft sensor, performs calculations and logical judgments, and outputs a command signal, and a controller that outputs a command signal by inputting signals from an input operating device and an aircraft sensor, In a control device for construction machinery, which includes an electro-hydraulic converter that converts the hydraulic signal into a hydraulic signal, and a hydraulic actuator that is driven by the converted hydraulic signal, the function of the controller is controlled by processing the input signal by receiving a signal from an input operating device. The system is divided into a sub-controller that performs the functions, and a controller that receives signals from the sub-controller and controls the electro-hydraulic converter, and both controllers are connected via serial communication, making it possible to create a complex system without using an expensive microcomputer. This not only makes it easier to deal with problems, but also standardizes sub-controllers and reduces the impact of failures on the entire system.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an electronic control portion of an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional example. DESCRIPTION OF SYMBOLS 1... Input operation device, 2... Aircraft sensor, 3... Console, 4A... Sub controller, 4B... Main controller, 5-7... Electro-hydraulic converter, 8...
・Bidirectional serial communication. Patent applicant: Kayabae Gyo Co., Ltd.=8-

Claims (1)

[Claims] A controller that inputs signals from input operating devices and body sensors, performs calculations and logical judgments, and outputs command signals, an electro-hydraulic converter that converts these command signals into hydraulic signals, and is driven by the converted hydraulic signals. In a control device for construction machinery equipped with a hydraulic actuator, the functions of the controller include a sub-controller that receives signals from an input operating device and processes the input signals, and an electro-hydraulic converter that receives signals from the sub-controller. 1. A control device for construction machinery, characterized in that the control device is divided into a controller that controls a section, and both controllers are connected via serial communication.