JP3498369B2 - Powered vehicle brake control device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brake control device for a power vehicle such as a tractor. 2. Description of the Related Art It is known that a brake device inside a turn is operated in conjunction with operation of a steering handle. In this device, when the steering wheel is operated and the front wheel steering angle exceeds a predetermined angle, the hydraulic brake is activated. [0003] In the above-mentioned conventional device, the brake device works in conjunction with the turning operation, and the brake device works intermittently. Not something. Steering wheel operation and brake
If the key device is linked, the field may be damaged by the rear wheel depending on the hardness of the field. In addition, there is a variation in processing performance of each valve for operating the hydraulic brake device, and there is a problem that the timing at which the brake is effective is not always constant. [0004] The present invention has been proposed in view of the above problems, and has taken the following technical measures. In other words, a rear wheel brake device that is independent on the left and right is provided,
In a powered vehicle that is configured so that a brake device inside a turn is operated in conjunction with a turning operation, the brake device is intermittently controlled by a pulse signal, and a pulse signal is output .
A memory for storing ON time and OFF time is set in the control unit.
Memory by connecting an external communication device.
ON / OFF time can be rewritten artificially
The structure of a brake device for a power vehicle characterized by the above-mentioned structure. An embodiment of the present invention will be described below with reference to an embodiment shown in the drawings. First, the structure will be described.
Is a tractor, 2 is a front wheel, and 3 is a rear wheel. Tractor
The engine 4 is mounted on the front of the vehicle, and a clutch housing 6 containing a main clutch 5 and a transmission case 8 containing a transmission are connected to the rear of the engine 4. In the transmission case 8, a main transmission 10 capable of four-speed shifting and an auxiliary transmission 11 capable of four-speed shifting are provided in series. [0006] These main and sub transmissions 10, 11
The rotational power decelerated by the rotation is transmitted to the rear wheel 3 and the front wheel 2. Reference numerals 15 and 15 denote braking devices for braking the rear wheels 3 and 3, respectively.
Reference numerals 5 and 15 are composed of hydraulic brakes. That is, when the left and right brake pedals 19, 19 are depressed, hydraulic oil flows into the operated hydraulic cylinder 15a, and the one-side brake device 15 is operated. The hydraulic cylinders 15a, 15a also operate in conjunction with the operation of the steering handle 18, and solenoids 20, 20 for rear wheel braking, which will be described later.
Is excited, the corresponding hydraulic cylinder 15a,
15a operates. That is, the steering handle 1
A front wheel steering angle sensor 22 for detecting a steering angle of the front wheel 2 is provided at a turning base of the front wheel 8.
When it is detected that the valve 2 has been operated at a predetermined angle or more, the solenoid 20 of the operated switching valve 17 is excited, hydraulic fluid is fed from the hydraulic pump 16 to the hydraulic cylinder 15a, and the hydraulic brake operates. . At the base of the position operation lever 24, there is provided a position setting device 25 for setting the elevation height, and the position and position of the lift arm angle sensor 29 attached to the rotation base of the lift arm 27 are determined by the position and the position. Hydraulic lifting / lowering mechanism (not shown) while comparing with the set value by setter 25
Is operated to perform position control. The hydraulic lifting mechanism controls the solenoid valve 32 for raising and the solenoid valve 33 for lowering while selectively exciting them. In FIG. 1, a rotary tilling device 34 is connected to the rear of the tractor 1 as a working machine.
The rotary tilling device 34 includes a rotary cover 35 for covering the cultivated portion, a rear cover 36 pivotally mounted on a rear portion thereof, and a rotary cover 35.
A tall mast 37 and the like are provided. At the rear upper end of the rotary cover 35, a tillage depth sensor 38 for electrically detecting a tillage depth change from a change in the swing angle of the rear cover 36 in the longitudinal direction is installed. FIG. 3 is a block diagram of the control device.
The configuration will be briefly described with reference to the drawing. An input side of a control unit 40 having a CPU includes a lift arm angle sensor 29, a position setting device 25, a tillage depth setting device 41, a tillage depth sensor 38,
The front wheel steering angle sensor 22 is connected. The output side of the control unit 40 is connected to an ascending solenoid valve 32, a descending solenoid valve 33, and left and right brake solenoids 20L and 20R. These brake solenoids 20L, 2L,
0R is intermittently controlled by a pulse signal, and is configured such that the ON time and the OFF time can each be changed. In the standard program of the control unit 40,
The basic ON time and OFF time are written in the key control. However, when the operator wants to rewrite the ON or OFF time, the ON / OFF time written in the standard program is used instead of the non-volatile memory. The operator himself / herself arbitrarily sets the writing to the E2PROM 42 so that the intermittent time of the brake control can be set. Writing of data is performed by communication with an external device such as a microcomputer checker 45. 46 is a liquid crystal display of the checker 45, 47 is an operation key, and 48 is a program card storing a check program. Next, the flowcharts of FIGS. 4 and 5 will be described. FIG. 4 illustrates the operation of the determination section as to whether or not to perform writing. In this embodiment, as a result of referring to the address of the E2PROM 42 used for brake control, if the value is 0FFH, Pulse control time (ON time 100 m
sec, OFF time 50 msec), and if not, that is, if data has been rewritten at least once, the ON time recorded in the E2PROM 42 and O
The FF time is used. An ON time of 100 msec or more is required to reliably operate the brake device. The OFF time is variously changed depending on the condition of the field. Further, in a place where the ground of the field is soft, it is better to lengthen the OFF time so that the rear wheel 3 does not sink into the ground during braking.
About msec is required. FIG. 5 illustrates the operation of rewriting data while performing communication between the microcomputer checker 45 and the controller 40 of the controller of the main unit. First, the microcomputer checker 45 is connected to the control unit 40, and the key
The switch is turned on and the power of the microcomputer checker 45 is turned on (steps S1, S2, S3). Then, the mode is switched to the pulse setting mode by the microcomputer checker 45 (step S4), and E2P
The data in the ROM 42 is read (step S5).
When the pulse ON time is to be changed, the operation key 47 is appropriately operated to rewrite the ON time to a desired time (step S).
7) After the setting is completed, the pulse OFF time is set (step S9). In this way, the ON time and the OFF time of the pulse are arbitrarily set by using the microcomputer checker 45. In a difficult field, the OFF time is shortened and the brake is intermittently turned and a small radius is turned. On the other hand, in a soft field, O
The FF time is made longer to shorten the time during which the rear wheel 3 is braked, so that the field is not damaged. As described above, the present invention provides a power vehicle having a rear-wheel braking device that is independent of the left and right, and an interlocking structure in which the braking device inside the turning is operated in conjunction with the turning operation. In the above, the intermittent control of the brake device is performed by a pulse signal, and the ON time and OFF time of the pulse are stored.
Memory in the control unit to connect external communication devices
The ON / OFF time stored in the memory
The brake device can always be operated in an optimal condition, and even if there is some variation in hydraulic valve performance in terms of machining accuracy, The ON time or the OFF time can be easily adjusted, and the performance can be stabilized. Further, an external communication device is connected to the control unit.
Rewrite pulse ON / OFF time from outside
The ON / OFF time of the brake control can be rewritten according to the condition of the soil in the field.
It can be done easily and can make small turns without breaking the field.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a tractor and a rotary tilling apparatus as a whole. FIG. 2 is a plan view of the tractor. FIG. 3 is a block diagram. FIG. 4 is a flowchart. FIG. 5 is a flowchart. [Description of Signs] 1 Tractor 2 Front wheel 3 Rear wheel 4 Engine 15 Brake device 19 Brake pedal

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B62D 11/00

Claims (1)

(1) A power vehicle having a left and right independent rear wheel brake device and an interlocking configuration in which a brake device inside the turn is operated in conjunction with a turning operation. the blur - with a key device intermittently controlled by a pulse signal, the pulse of O
A memory for storing N time and OFF time is installed in the control unit.
Memory by connecting an external communication device.
ON / OFF time can be rewritten artificially
A braking device for a powered vehicle, characterized in that: