JP2021181271A - Concrete mixer truck - Google Patents

Abstract

To properly control a mixer drum by a control panel.SOLUTION: A concrete mixer truck 1 is equipped with a parking brake 12, a mixer drum 2 rotatably mounted on a vehicle, a parking brake sensor 22 that outputs a parking signal indicating the actuation and non-actuation of the parking brake 12, a vehicle speed sensor 21 that detects the vehicle speed of the vehicle, and a controller 20 that controls the driving of the concrete mixer truck 2. The controller 20 detects the abnormal condition of the parking signal, while the parking signal indicates the actuation of the parking brake 12 and the vehicle speed is 0 or more, or while the parking signal indicates the non-actuation of the parking brake 12 and the vehicle speed is 0 continuously for a predetermined time.SELECTED DRAWING: Figure 3

Description

The present invention relates to a mixer vehicle.

Patent Document 1 includes a mixer drum mounted on a gantry and rotatable in the stirring direction and the discharging direction, a drive device for rotationally driving the mixer drum, and a controller for controlling the operation of the drive device. A mixer wheel that is automatically agitated by controlling the rotation direction and rotation speed of the mixer drum is disclosed. The signal of the parking brake sensor for detecting the lever position of the parking brake is input to the controller. The automatic stirring of the mixer drum refers to the signal of the parking brake sensor and is performed when the parking brake lever is not in the braking position.

Japanese Unexamined Patent Publication No. 2010-228152

In the mixer vehicle described in Patent Document 1, for example, the lever position of the parking brake may not be accurately transmitted due to a disconnection of the wiring for transmitting the signal of the parking brake sensor. On the other hand, the automatic stirring of the mixer drum is switched according to the state of the mixer vehicle, that is, whether or not the parking brake is in the braking position. Therefore, if the lever position of the parking brake is not accurately transmitted, the automatic stirring of the mixer drum may not be properly controlled.

The present invention has been made in view of the above problems, and an object of the present invention is to appropriately control the automatic stirring of the mixer drum.

The present invention is a mixer vehicle, and detects a parking brake, a mixer drum rotatably mounted on the vehicle, a parking brake sensor that outputs a parking signal indicating whether the parking brake is activated or not, and a vehicle speed of the vehicle. The vehicle speed detecting means and the mixer drum control device for controlling the drive of the mixer drum are provided, and the mixer drum control device is in a state where the parking signal indicates the operation of the parking brake and the vehicle speed is greater than 0, or the parking signal is the parking brake. It is characterized in that an abnormality in the parking signal is detected in a state where the vehicle is inactive and the vehicle speed is continuously 0 for a predetermined time.

In the present invention, since the mixer drum control device can detect an abnormality in the parking signal, the state of the mixer vehicle can be accurately determined by detecting the abnormality. As a result, the automatic stirring of the mixer drum of the mixer wheel can be appropriately performed.

The present invention is characterized in that the mixer drum control device detects an abnormality in the parking signal when the parking signal indicates the operation of the parking brake and the state in which the vehicle speed is higher than 0 continues for a predetermined time.

In the present invention, the abnormality of the parking signal can be reliably detected.

The present invention further includes an operation panel for manually operating the mixer drum, and when the mixer drum control device detects an abnormality in the parking signal, the mixer drum cannot be operated by the operation panel when the vehicle speed is higher than 0. It is characterized by doing.

In the present invention, when the parking signal is abnormal, the mixer drum is manually operated by the operation panel while the mixer vehicle is running to prevent the loaded object from being ejected.

According to the present invention, the automatic stirring of the mixer drum can be appropriately controlled.

It is a top view of the mixer wheel which concerns on embodiment of this invention. It is a rear view which looked at the mixer wheel which concerns on embodiment of this invention from the rear. It is a block diagram which shows the hardware composition of the mixer vehicle which concerns on embodiment of this invention. It is a figure which shows the state and the transition of the state of the mixer vehicle which concerns on embodiment of this invention.

Hereinafter, the mixer vehicle 1 according to the embodiment of the present invention will be described with reference to the drawings.

The mixer vehicle 1 is a vehicle that transports so-called ready-mixed concrete (hereinafter, referred to as “ready-mixed concrete”) such as mortar and ready-mixed concrete put into the mixer drum 2. In the following description, a case where the mixer vehicle 1 loads ready-mixed concrete as a load will be described.

As shown in FIGS. 1A and 1B, the mixer vehicle 1 is a vehicle including a driver's cab 11 and a gantry 3. The mixer vehicle 1 detects the vehicle speed of the vehicle, the parking brake 12, the mixer drum 2 rotatably mounted on the vehicle, the parking brake sensor 22 that outputs a parking signal indicating the operation or non-operation of the parking brake 12. A vehicle speed sensor 21 as a vehicle speed detecting means and a controller 20 as a mixer drum control device for controlling the drive of the mixer drum 2 are provided.

The mixer drum 2 is a bottomed cylindrical container rotatably mounted on the gantry 3, and an opening 2a for loading and unloading ready-mixed concrete is provided at the rear end thereof. The mixer drum 2 is mounted so as to be inclined so that its rotation axis O gradually rises from the front portion to the rear portion of the vehicle. Drum blades (not shown) are spirally arranged in the mixer drum 2 along the inner wall surface of the drum, and the drum blades rotate together with the mixer drum 2 to stir the ready-mixed concrete loaded in the mixer drum 2. Will be.

A hopper 16 is provided at the upper rear portion of the opening 2a of the mixer drum 2. The ready-mixed concrete put into the mixer wheel 1 in the ready-mixed concrete factory is guided to the opening 2a by the hopper 16. A flow guide 17 and a chute 18 are provided at the lower rear portion of the opening 2a of the mixer drum 2. The ready-mixed concrete discharged from the opening 2a is guided to the chute 18 by the flow guide 17, and is discharged in a predetermined direction by the chute 18.

The mixer drum 2 is rotationally driven via a drive device 4 using a traveling engine 10 mounted on the mixer vehicle 1 as a drive source. The drive device 4 is a fluid pressure device that is driven by the rotation of the engine 10 and rotationally drives the mixer drum 2 by the fluid pressure of the working fluid.

As shown in FIG. 2, the engine 10 has a throttle valve 10a for adjusting the output and the rotation speed of the engine 10. The opening degree of the throttle valve 10a is controlled by the controller 20 via an actuator (not shown) when the drive device 4 is driven by the engine 10. Further, the engine 10 is provided with a rotation sensor 10b that detects the rotation speed of the engine 10 and outputs a signal corresponding to the detected rotation speed to the controller 20.

The rotation speed of the engine 10 when driving the drive device 4 is controlled by the controller 20 via the throttle valve 10a so that the rotation speed detected by the rotation sensor 10b becomes a predetermined magnitude. The rotation sensor 10b may detect the rotation speed of the PTO shaft 9 or the drive shaft 8 described later, which is the input shaft of the drive device 4, or may detect the rotation speed of the hydraulic pump 5 described later. May be.

The rotation of the engine 10 is transmitted to the drive device 4 via a PTO shaft 9 (PTO: Power take-off) that constantly takes out power from the engine 10 and a drive shaft 8 that connects the PTO shaft 9 and the drive device 4. Will be done.

The drive device 4 includes a hydraulic pump 5 driven by an engine 10 to discharge hydraulic oil as a hydraulic fluid, a hydraulic motor 6 operated by hydraulic oil supplied from the hydraulic pump 5 to rotate and drive a mixer drum 2, and a hydraulic pump 5. It has an electromagnetic proportional valve 31 that controls the flow of hydraulic fluid supplied from the hydraulic motor 6 to the hydraulic motor 6. In the drive device 4, instead of the hydraulic fluid, another incompressible fluid may be used as the hydraulic fluid.

The hydraulic pump 5 is rotationally driven by a power constantly taken out from the engine 10 via the PTO shaft 9. The drive source for rotationally driving the hydraulic pump 5 is not limited to the traveling engine 10, and may be an auxiliary engine or an electric motor that is not used for traveling.

The hydraulic pump 5 is a swash plate type axial piston pump having a variable capacity. The hydraulic oil discharged from the hydraulic pump 5 is supplied to the hydraulic motor 6, and the hydraulic motor 6 rotates. The rotation of the hydraulic motor 6 is transmitted to the mixer drum 2 via the speed reducer 7. In the hydraulic pump 5, as the pump discharge pressure guided by the actuator increases due to the operation of the actuator (not shown) to which the pump discharge pressure is guided, the pump discharge amount becomes smaller against the tilting spring that urges the swash plate. Is controlled to be. The pump discharge pressure guided to the actuator is adjusted by a load sensing valve (not shown). The load sensing valve adjusts the pump discharge pressure guided to the actuator so that the differential pressure between the discharge pressure of the hydraulic pump 5 and the pressure (load pressure) supplied to the hydraulic motor 6 becomes a predetermined value.

When the mixer drum 2 is rotated in the normal direction by the hydraulic pump 5, the ready-mixed concrete in the mixer drum 2 is agitated. On the other hand, when the mixer drum 2 is reversely operated by the hydraulic pump 5, the ready-mixed concrete in the mixer drum 2 is discharged to the outside from the opening at the rear end via the flow guide 17 and the chute 18.

The hydraulic motor 6 is a swash plate type axial piston motor having a variable capacity. The hydraulic motor 6 is rotationally driven by receiving the supply of hydraulic oil discharged from the hydraulic pump 5. The hydraulic motor 6 includes a solenoid valve (not shown) that receives a second speed switching signal from the controller 20 and adjusts the tilt angle of the swash plate (not shown). The capacity of the hydraulic motor 6 is switched between a small capacity for high-speed rotation (2nd speed) and a large capacity for normal rotation (1st speed) by switching the solenoid valve. The hydraulic motor 6 may have a capacity that can be switched steplessly.

The hydraulic motor 6 is provided with a rotation sensor 6a as a rotation speed detector. The rotation sensor 6a detects the rotation direction of the output shaft (not shown) and the rotation speed of the output shaft, and outputs a rotation direction signal and a rotation speed signal to the controller 20.

A closed circuit L is provided between the hydraulic pump 5 and the hydraulic motor 6, and hydraulic oil circulates in the closed circuit L. An electromagnetic proportional valve 31 is provided in the closed circuit L. The electromagnetic proportional valve 31 has a normal rotation position 31A that guides the hydraulic oil discharged by the hydraulic pump 5 to the hydraulic motor 6 so as to rotate the mixer drum 2 in the forward direction, and causes the hydraulic oil discharged by the hydraulic pump 5 to rotate in the reverse direction. A reverse position 31B leading to the hydraulic motor 6 and a neutral position 31C for blocking the flow of hydraulic oil from the hydraulic pump 5 to the hydraulic motor 6 are provided.

The electromagnetic proportional valve 31 has a pair of solenoids 32a and 32b and a pair of return springs 33a and 33b. The pair of solenoids 32a and 32b are operated by a control signal output from the controller 20. Specifically, the control signal is a current value. By adjusting this current value, the position of the electromagnetic proportional valve 31 is steplessly switched by the forward rotation position 31A, the neutral position 31C, and the reverse rotation position 31B.

When the solenoid proportional valve 31 is energized to one of the solenoids 32a, the electromagnetic proportional valve 31 is switched to the normal rotation position 31A with an opening degree according to the energization amount. As a result, the hydraulic motor 6 is supplied with hydraulic oil having a flow rate corresponding to the opening degree of the electromagnetic proportional valve 31 so as to rotate the mixer drum 2 in the forward rotation direction.

On the contrary, the electromagnetic proportional valve 31 is switched to the reversing position 31B at an opening degree according to the amount of energization by energizing the other solenoid 32b. As a result, the hydraulic motor 6 is supplied with hydraulic oil having a flow rate corresponding to the opening degree of the electromagnetic proportional valve 31 so as to rotate the mixer drum 2 in the reverse direction. The opening degree of the electromagnetic proportional valve 31 increases as the amount of energization to the solenoids 32a and 32b increases, and a large flow rate is guided to the hydraulic motor 6.

When the energization of the pair of solenoids 32a and 32b is cut off, the electromagnetic proportional valve 31 is switched to the neutral position 31C by the urging force of the pair of return springs 33a and 33b. At the neutral position 31C, the supply of hydraulic oil to the hydraulic motor 6 is cut off, so that the hydraulic motor 6 is not rotationally driven.

In the drive device 4 having the above configuration, the hydraulic motor 6 is rotated by supplying the hydraulic oil discharged from the hydraulic pump 5 to the hydraulic motor 6, and the flow of the supplied hydraulic oil, the amount of oil, and the inclination of the hydraulic motor 6 are inclined. The rotation speed of the hydraulic motor 6 is changed according to the tilt angle of the plate.

The output shaft of the drive device 4, that is, the output shaft of the hydraulic motor 6, is connected to the rotation shaft O of the mixer drum 2 via the speed reducer 7. Therefore, it is possible to increase or decrease the rotation speed of the mixer drum 2 by increasing or decreasing the rotation speed of the hydraulic motor 6, and by switching the rotation direction of the hydraulic motor 6, the rotation direction of the mixer drum 2 is changed to the forward rotation direction. It is possible to switch between a certain stirring direction and a discharge direction which is a reverse rotation direction.

As described above, since the rotation speed and the rotation direction of the mixer drum 2 correlate with the rotation speed and the rotation direction of the hydraulic motor 6, the rotation speed and the rotation direction of the mixer drum 2 can be grasped from the detection value of the rotation sensor 6a of the hydraulic motor 6. It is possible to do. The rotation sensor 6a may detect the rotation speed and the rotation direction of the mixer drum 2 instead of the hydraulic motor 6.

When the mixer drum 2 is rotationally driven in the stirring direction, the ready-mixed concrete in the mixer drum 2 moves forward while being stirred by the drum blade. On the other hand, when the mixer drum 2 is rotationally driven in the discharge direction, the ready-mixed concrete in the mixer drum 2 moves backward while being agitated by the drum blade.

By rotating the mixer drum 2 in the discharge direction opposite to the stirring direction in this way, the ready-mixed concrete can be discharged from the opening 2a of the mixer drum 2. The ready-mixed concrete discharged from the mixer drum 2 is guided to a predetermined position via the flow guide 17 and the chute 18.

When the ready-mixed concrete is put into the mixer drum 2 via the hopper 16, the put-in ready-mixed concrete is swiftly moved to the front of the mixer drum 2 by rotating the mixer drum 2 in the stirring direction at a higher speed than during stirring. Move it.

The controller 20 is composed of a microcomputer provided with a CPU (central processing unit), ROM (read-only memory), RAM (random access memory), I / O interface (input / output interface), and the like. The RAM stores data in the processing of the CPU, the ROM stores the control program of the CPU in advance, and the I / O interface is used for input / output of information with the connected device. The operation of the drive device 4 is controlled by operating the CPU, RAM, or the like according to a program stored in the ROM.

As described above, the rotation sensor 6a of the hydraulic motor 6 and the rotation sensor 10b of the engine 10 are connected to the controller 20. Further, the parking brake sensor 22 and the vehicle speed sensor 21 are connected to the controller 20, and the detected values detected by these sensors are input. Further, as described above, the electromagnetic proportional valve 31 and the throttle valve 10a of the engine 10 are connected to the controller 20, and a command value for operating them is output from the controller 20.

Further, the mixer wheel 1 further includes an operation panel 40 for manually operating the mixer drum 2. An operation panel 40 is connected to the controller 20, and the rotation direction and rotation speed of the mixer drum 2 are manually operated via the operation panel 40. The operation panel 40 includes a first operation panel 41 provided in the driver's cab 11, a second operation panel 42 provided on the right rear side of the mixer vehicle 1, and a third operation panel 43 provided on the left rear side of the mixer vehicle 1. It has a fourth operation panel 44 provided in the vicinity of the hopper 16.

The first operation panel 41 is provided in the driver's cab 11 so that the mixer drum 2 can be operated even while the vehicle is running. The first operation panel 41 is provided with a dial knob type potentiometer 41a for changing the rotation direction and rotation speed of the mixer drum 2, and an emergency stop switch 41b for stopping the rotation of the mixer drum 2 in an emergency.

The second operation panel 42 is provided on the right rear side of the mixer vehicle 1 in order to enable the operation of the mixer drum 2 while observing the amount of ready-mixed concrete discharged to the right side of the vehicle via the chute 18. The second operation panel 42 is provided with a dial knob type potentiometer 42a for changing the rotation direction and rotation speed of the mixer drum 2, and an emergency stop switch 42b for stopping the rotation of the mixer drum 2 in an emergency.

The third operation panel 43 is provided on the left rear side of the mixer vehicle 1 in order to enable the operation of the mixer drum 2 while observing the amount of ready-mixed concrete discharged to the left side of the vehicle via the chute 18. For example, when discharging ready-mixed concrete in a state where two mixer cars 1 are arranged side by side, a second operation panel 42 provided on the right rear side of one vehicle is operated while a second operation panel 42 provided on the left rear side of the other vehicle is operated. 3 By operating the operation panel 43, the ready-mixed concrete can be supplied without interruption or a large amount of ready-mixed concrete can be supplied.

Similar to the second operation panel 42, the third operation panel 43 includes a dial knob type potentiometer 43a for changing the rotation direction and rotation speed of the mixer drum 2, and an emergency for stopping the rotation of the mixer drum 2 in an emergency. A stop switch 43b and the like are provided.

The fourth operation panel 44 is provided around the hopper 16, that is, above the vehicle, so that the mixer drum 2 can be operated while checking the remaining amount of the ready-mixed concrete in the mixer drum 2. Similar to the second operation panel 42 and the third operation panel 43, the fourth operation panel 44 includes a dial knob type potentiometer 44a for changing the rotation direction and rotation speed of the mixer drum 2, and the rotation of the mixer drum 2 in an emergency. An emergency stop switch 44b for stopping the engine is provided.

These operation panels 41 to 44 may be a stationary type fixed to the vehicle, or may be a removable type that is connected to the vehicle via a cable and can be removed.

The potentiometers 41a to 44a provided on the operation panels 41 to 44 are variable resistors whose electric resistance value changes according to the amount of rotation operation, and when the potentiometers 41a to 44a are rotated by an operator, the controller 20 is a drive such as a tilt angle of the swash plate of the hydraulic pump 5 and a tilt angle of the swash plate of the hydraulic motor 6 so that the rotational state of the mixer drum 2 is in a state corresponding to the electric resistance values of the potentiometers 41a to 44a. It controls each mechanism constituting the device 4.

Specifically, when the potentiometer 41a is rotated clockwise by the operator on the first operation panel 41, the controller 20 rotates the mixer drum 2 in the stirring direction according to the electric resistance value of the potentiometer 41a. Rotate with. On the contrary, when the potentiometer 41a is rotated counterclockwise by the operator, the controller 20 rotates the mixer drum 2 in the discharge direction at a rotation speed corresponding to the electric resistance value of the potentiometer 41a.

The first operation panel 41, the second operation panel 42, the third operation panel 43, and the fourth operation panel 44 (hereinafter, these are collectively referred to simply as "operation panel 40") are in the running state of the mixer vehicle. Operation rights are granted accordingly. That is, the operation panel 40 is switched between an operable state and an inoperable state depending on the traveling state of the mixer vehicle.

The controller 20 refers to the parking signal and the vehicle speed of the mixer vehicle 1 input by the vehicle speed sensor 21, and determines the traveling state of the mixer vehicle 1. Specifically, the controller 20 determines whether the running state of the mixer vehicle 1 is a stopped state, a running standby state, a running state, or an estimated running state based on the parking signal and the vehicle speed of the mixer car 1. do. The start of automatic stirring of the mixer drum 2 is controlled according to the traveling state of the mixer wheel 1 determined in this way. The automatic stirring prevents the ready-mixed concrete from solidifying while the mixer wheel 1 is running. When the automatic stirring is started, the mixer drum 2 is rotationally driven in the stirring direction, and the ready-mixed concrete in the mixer drum 2 moves forward while being stirred by the drum blade, and thereafter, the automatic stirring is continued. Further, the controller 20 grants an operation right to the operation panel 40 according to the traveling state of the mixer vehicle 1. Hereinafter, the determination of the running state of the mixer wheel 1 by the controller 20, the control of the start of automatic stirring of the mixer drum 2, and the granting of the operation right of the operation panel 40 will be specifically described.

As shown in FIG. 3, the controller 20 determines that the mixer vehicle 1 is in a stopped state when the parking signal indicates the operation of the parking brake 12 and the vehicle speed is 0. The state in which the vehicle speed is 0 means that the mixer vehicle 1 is stopped. The work of discharging the ready-mixed concrete from the mixer drum 2 is performed, for example, in a stopped state. Therefore, in the stopped state, the automatic stirring of the mixer drum 2 is not started, and the operation panel 40 is given the operation right of the mixer drum 2 so that the mixer drum 2 can be operated. As described above, in the stopped state, the mixer vehicle 1 can discharge the ready-mixed concrete by operating the operation panel 40. Further, in the stopped state, by operating the operation panel 40, not only the ready-mixed concrete is discharged, but also foreign substances such as washing water and rainwater in the mixer drum 2 are discharged before the ready-mixed concrete is put in, and the ready-mixed concrete is discharged before the additional put-in and before the ready-mixed concrete is put in. Automatic kneading and automatic cleaning inside the mixer drum 2 are possible. The controller 20 resets the operation right of the mixer drum 2 of the operation panel 40 to make it inoperable in the state where the automatic kneading and the automatic stirring are performed even when the vehicle is stopped, and when the automatic kneading and the automatic stirring are completed, the controller 20 resets the operation right. The operation panel 40 is given the operation right of the mixer drum 2 so that it can be operated.

When the parking signal indicates that the parking brake 12 is not activated and the vehicle speed is 0, the controller 20 determines that the mixer vehicle 1 is in the traveling standby state in which the mixing vehicle 1 is waiting for traveling. For example, when the parking signal changes from the stopped state to the one indicating that the parking brake 12 is not activated, the vehicle shifts to the running standby state. Further, even when the vehicle speed temporarily stops from the traveling state described later and the vehicle speed becomes 0, the vehicle shifts to the traveling standby state.

The controller 20 determines that the mixer vehicle 1 is traveling when the parking signal indicates that the parking brake 12 is not activated and the vehicle speed is greater than 0. The state in which the vehicle speed is higher than 0 is the state in which the mixer vehicle 1 is moving. For example, when the vehicle speed changes from the running standby state to a state higher than 0, the vehicle shifts to the running state.

In the running state, automatic stirring of the mixer drum 2 is continued in order to prevent solidification of the ready-mixed concrete. Further, in order to prevent the operation panel 40 from being unintentionally operated during traveling and discharging the ready-mixed concrete, the operation right of the mixer drum 2 of the operation panel 40 is reset to be inoperable in the traveling state. As described above, in the running state, automatic stirring is executed to prevent the mixer car 1 from solidifying the ready-mixed concrete and to prevent the ready-mixed concrete from being discharged due to an erroneous operation of the operation panel 40.

Further, during the transportation of the ready-mixed concrete by the mixer vehicle 1, the mixer vehicle 1 transports the ready-mixed concrete while repeating the traveling state and the traveling standby state, and the traveling standby state is a state according to the traveling state. Therefore, in the running standby state, the automatic stirring of the mixer drum 2 is started as in the running state, and the operation panel 40 is given the operation right of the mixer drum 2 so that the mixer drum 2 can be operated. As described above, in the traveling standby state, the mixer vehicle 1 is prevented from solidifying the ready-mixed concrete, and the ready-mixed concrete can be discharged by operating the operation panel 40.

Here, it is conceivable that the state of the parking brake 12 may not be accurately transmitted to the controller 20 due to, for example, a disconnection of the wiring for transmitting the parking signal. In this case, the parking signal is not input to the controller 20, but a signal indicating the operation or non-operation of the parking brake 12 is input to the controller 20 regardless of the actual state of the parking brake 12. Therefore, the parking signal indicates the operation of the parking brake 12, and the vehicle speed is greater than 0, which does not normally occur, or the parking signal indicates the non-operation of the parking brake 12 in the running standby state, and the vehicle speed continues for a long time. A state of 0 occurs. In particular, when the parking signal indicates the operation of the parking brake 12 and the vehicle speed is higher than 0, it may not be possible to properly control whether or not the mixer drum is automatically agitated, and the mixer drum may not be properly controlled. be.

Therefore, the controller 20 of the mixer vehicle 1 according to the present embodiment refers to the parking signal and the vehicle speed of the mixer vehicle 1 input by the vehicle speed sensor 21, and provides a parking signal abnormality detection method for detecting an abnormality in the parking signal. Run.

Specifically, the controller 20 indicates a state in which the parking signal indicates the operation of the parking brake 12 and the vehicle speed is greater than 0, which cannot normally occur, in other words, a state indicated by the vehicle speed (the mixer vehicle 1 is running). In a state where there is a contradiction between the state indicated by the parking signal and the state indicated by the parking signal (the mixer car 1 is stopped), an abnormality in the parking signal is detected. In this state, based on the information that the vehicle speed is greater than 0, it is determined that the traveling state of the mixer vehicle 1 is the estimated traveling state in which the mixer vehicle 1 is presumed to be traveling.

For example, when the parking signal changes from the stopped state to a state where the vehicle speed is greater than 0 with the signal indicating that the parking brake 12 is activated, or when the parking signal changes from the running state to a state indicating the operation of the parking brake 12, the estimated running state. Move to. In the estimated running state, when the mixer drum 2 is not automatically agitated, the automatic agitation is started. Further, the operation right of the mixer drum 2 of the operation panel 40 is reset to make it inoperable. In this state, the mixer wheel 1 is prevented from solidifying the ready-mixed concrete, and the ready-mixed concrete is prevented from being discharged due to an erroneous operation of the operation panel 40. That is, in the estimated running state, the operation right of the operation panel 40 is controlled and the automatic stirring is controlled in the same manner as in the running state.

Further, the controller 20 detects an abnormality in the parking signal even when the vehicle speed is continuously 0 for a long time (predetermined time) in the traveling standby state. It is conceivable that the vehicle speed of the mixer vehicle 1 becomes 0 when the vehicle is temporarily stopped due to a traffic light or a traffic jam while traveling, or when the vehicle is stopped for a long time due to the discharge work of ready-mixed concrete or the like. Normally, in the former case, since the parking brake 12 is not activated, the mixer vehicle 1 is in the traveling standby state, and the traveling standby state continues for several seconds to several minutes. In the latter case, since the parking brake 12 is operating, the mixer vehicle 1 is in a stopped state, and the stopped state is often continued for 10 minutes or more. If an abnormality occurs in the parking signal when the vehicle is stopped for a long time due to the discharge work of ready-mixed concrete as in the latter case, the parking signal indicates that the parking brake 12 is not operating and the vehicle speed is continuously 0 for a long time. Therefore, in order to accurately detect the abnormality of the parking signal, the abnormality of the parking signal is not detected when the vehicle is temporarily stopped as in the former case, and the abnormality of the parking signal is detected when the vehicle is stopped for a long time as in the latter case. Try to detect. Therefore, the predetermined time for detecting the abnormality of the parking signal is set to, for example, 10 minutes based on the stop time when the vehicle is stopped for a long time in order to accurately detect the abnormality of the parking signal.

As described above, the controller 20 indicates that the parking signal indicates that the parking brake 12 is activated and the vehicle speed is greater than 0, or the parking signal indicates that the parking brake 12 is not activated and the vehicle speed is continuously 0 for a predetermined time. In the state, the abnormality of the parking signal is detected. More specifically, the controller 20 compares the state indicated by the parking signal with the state indicated by the vehicle speed, and detects that the parking signal is abnormal when there is a contradiction between the two. In this way, since the controller 20 can detect an abnormality in the parking signal, it is possible to appropriately determine the running state of the mixer vehicle 1 by detecting the abnormality, and whether or not the mixer drum 2 is automatically agitated. It is possible to change the control and the control of whether or not to give the operation right to the operation panel 40. As a result, the automatic stirring of the mixer drum 2 of the mixer wheel 1 can be appropriately performed. Further, the operation right can be appropriately granted to the operation panel 40 for manually operating the mixer drum 2. The above-mentioned "detection of an abnormality in the parking signal when the parking signal indicates the operation of the parking brake 12 and the vehicle speed is greater than 0" means that the abnormality is detected immediately when the state is reached, and the state is It means that an abnormality is detected after a lapse of a predetermined time.

Further, as described above, when the controller 20 determines that the traveling state is estimated, the controller 20 resets the operation right of the mixer drum 2 of the operation panel 40 to make it inoperable. That is, the controller 20 enables the mixer drum 2 to be operated by the operation panel 40 in a state where the parking signal indicates the operation of the parking brake 12 (stopped state), and when an abnormality in the parking signal is detected, the vehicle speed is greater than 0. In the state (estimated running state), the operation panel 40 makes it impossible to operate the mixer drum 2. As a result, when the parking signal is abnormal, the mixer drum 2 is manually operated by the operation panel 40 while the mixer vehicle 1 is running, and it is possible to prevent the loaded concrete such as the ready-mixed concrete from being discharged.

The controller 20 may detect an abnormality in the parking signal and shift to an estimated running state when the parking signal indicates the operation of the parking brake 12 and the vehicle speed is higher than 0 for a predetermined time. .. This predetermined time is different from the predetermined time of "when the vehicle speed is 0 continuously for a long time (predetermined time)" for detecting the abnormality of the parking signal in the above-mentioned traveling standby state.

Even in a state where the parking signal is not abnormal, the mixer vehicle 1 may temporarily switch to a state in which the parking signal indicates the operation of the parking brake 12 due to the influence of external noise or the like during the traveling state. In this case, since the parking signal temporarily indicates the operation of the parking brake 12 and the vehicle speed is higher than 0, the controller 20 has an abnormal parking signal even though the parking signal is not abnormal. Will be detected. Therefore, the controller 20 detects that the parking signal is abnormal when the parking signal indicates the operation of the parking brake 12 and the vehicle speed is higher than 0 for a predetermined time, thereby being affected by external noise and the like. It is possible to reliably detect an abnormality in the parking signal by eliminating the noise.

If this predetermined time is long, the mixer vehicle 1 is stopped and the ready-mixed concrete is put in, and then the vehicle departs with an abnormality in the parking signal. The parking signal indicates the operation of the parking brake 12 and the vehicle speed is 0. When it becomes a larger state, it does not shift from the stopped state to the estimated running state for a long time. In this case, the automatic stirring of the mixer drum 2 may not be started for a long time, and the ready-mixed concrete may solidify. Therefore, this predetermined time is set to a time during which the quality is not affected even if the ready-mixed concrete is not stirred, for example, 30 seconds.

Further, the controller 20 may give the operation right of the mixer drum 2 to only one of the operation panels 40, or the operation right may be passed between the operation panels 40. For example, when the mixer car 1 is stopped, the operation right of the mixer drum 2 is given only to the first operation panel 41 provided in the driver's cab 11 so that the mixer drum 2 can be operated. After kneading, the operation right may be handed over to the second operation panel 42 and the third operation panel 43 provided behind the mixer wheel 1, and the ready-mixed concrete may be discharged.

Further, when the controller 20 detects an abnormality in the parking signal, the controller 20 may, for example, notify the driver or transfer information on the occurrence of the abnormality. Notification to the driver, transfer of information on the occurrence of an abnormality, etc. may not be performed at the same time as detection of an abnormality in the parking signal.

Further, the controller 20 may start automatic stirring of the mixer drum 2 when the estimated running state continues for, for example, 5 seconds or more after shifting to the estimated running state. That is, the change in the control of the controller 20 when the transition to the estimated travel state does not have to be performed at the same time as the transition to the estimated travel state.

Next, a modified example of the above embodiment will be described.

In the above embodiment, the controller 20 determines the running state of the mixer vehicle 1 and detects an abnormality in the parking signal from the parking signal input by the parking brake sensor 22 and the vehicle speed input by the vehicle speed sensor 21. The vehicle speed is not limited to that input by the vehicle speed sensor 21, and may be calculated based on GPS position information, an acceleration sensor, an image taken by a drive recorder, or the like, and input to the controller 20.

In the above embodiment, the operation panels 40 are provided at four locations of the operation panels 41 to 44. The number of operation panels is not limited to this, and may be provided at only one place or at four or more places.

The configuration, operation, and effect of the embodiment of the present invention configured as described above will be collectively described.

The mixer vehicle 1 detects the parking brake 12, the mixer drum 2 rotatably mounted on the vehicle, the parking brake sensor 22 that outputs a parking signal indicating whether the parking brake 12 is activated or not, and the vehicle speed of the vehicle. The vehicle speed sensor 21 and the controller 20 for controlling the drive of the mixer drum 2 are provided, and the controller 20 is in a state where the parking signal indicates the operation of the parking brake 12 and the vehicle speed is greater than 0, or the parking signal is the parking brake 12. An abnormality in the parking signal is detected in a state where the vehicle is inactive and the vehicle speed is 0 continuously for a predetermined time.

In this configuration, since the controller 20 can detect an abnormality in the parking signal, the state of the mixer vehicle can be accurately determined by detecting the abnormality. As a result, the automatic stirring of the mixer drum 2 of the mixer wheel 1 can be appropriately performed.

The controller 20 detects an abnormality in the parking signal when the parking signal indicates the operation of the parking brake 12 and the state in which the vehicle speed is higher than 0 continues for a predetermined time.

With this configuration, it is possible to reliably detect an abnormality in the parking signal.

The mixer vehicle 1 further includes an operation panel 40 for manually operating the mixer drum 2, and when the controller 20 detects an abnormality in the parking signal, the controller 20 uses the operation panel 40 to operate the mixer drum 2 when the vehicle speed is higher than 0. Disable operation.

In this configuration, when the parking signal is abnormal, the mixer drum 2 is manually operated by the operation panel 40 while the mixer vehicle 1 is running, and the loaded object is prevented from being ejected.

Although the embodiments of the present invention have been described above, the above embodiments are only a part of the application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiments. No.

1 ... Mixer car, 2 ... Mixer drum, 12 ... Parking brake, 20 ... Controller (mixer drum control device), 21 ... Vehicle speed sensor (vehicle speed detection means), 22 ... Parking brake sensor , 40 ... Operation panel

Claims (3)

It ’s a mixer car,
With the parking brake
A mixer drum that is rotatably mounted on the vehicle,
A parking brake sensor that outputs a parking signal indicating whether the parking brake is activated or not,
Vehicle speed detecting means for detecting the vehicle speed of the vehicle,
A mixer drum control device for controlling the drive of the mixer drum is provided.
In the mixer drum control device, the parking signal indicates that the parking brake is activated and the vehicle speed is greater than 0, or the parking signal indicates that the parking brake is not activated and the vehicle speed is continuously 0 for a predetermined time. A mixer vehicle characterized in that an abnormality in the parking signal is detected in this state. The mixer vehicle according to claim 1.
The mixer drum control device is a mixer vehicle, characterized in that an abnormality of the parking signal is detected when the parking signal indicates the operation of the parking brake and the state in which the vehicle speed is higher than 0 continues for a predetermined time. The mixer vehicle according to claim 1 or 2.
Further equipped with an operation panel for manually operating the mixer drum,
The mixer vehicle is characterized in that when an abnormality in the parking signal is detected, the mixer drum control device makes it impossible to operate the mixer drum by the operation panel when the vehicle speed is higher than 0.

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