JPH0920233A - Lock brake device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an alarming device and a safety device, having relatively simple constitution, related to the lock brake of a vehicle. SOLUTION: Normally-opening magnet valves 3 and 4 are respectively located in a line through which a brake liquid pressure generated by the pedaling force of a brake pedal 1 is guided to a front brake and a rear brake. When, during lock brake in which a controller 30 closes magnet valves 3 and 4 to form a check valve, reduction of a break liquid pressure or movement of a vehicle is detected, an alarm lamp 44, an alarm buzzer 45, and a Klaxon 50 are operated and a brake actuator 5 increases the break liquid pressure of the rear brake.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock brake device for securing a braking force during parking to enhance the safety of an operator or the like near a vehicle, and more particularly to an alarm device and a safety device thereof.

[0002]

2. Description of the Related Art Auxiliary brake device for work in a vehicle,
As a so-called lock brake device, it is an actual flat 1-9
As disclosed in Japanese Patent No. 9765, a vacuum differential pressure between two chambers sandwiching a power piston of a booster is detected by a differential pressure switch, and the operating condition of the power piston is monitored by the differential pressure switch. It has been known in the past to issue an alarm when the power is lowered, but in this case, since the operating state of the power piston is only monitored by detecting the vacuum differential pressure, the booster It is difficult to detect an accident such as a liquid leak that has occurred in the hydraulic system from the wheel cylinder to the wheel cylinder, and the cost is increased due to the installation of the differential pressure switch. Even if you move around, you may not be able to give an alarm, or even if an alarm is given, noise may occur during work. There is a fear such that not notice the warning, not be said to be always thorough view of safety.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to provide an alarm device and / or a safety device for a vehicle lock brake with a relatively simple structure.

[0004]

To achieve this object, a lock brake device according to a first aspect of the present invention comprises a lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, It has a fluid pressure detection means for detecting the brake working fluid pressure, an alarm means, and a control means, and the control means detects that the brake working fluid pressure has dropped to a predetermined value or less when the locking means is actuated. When the fluid pressure detecting means detects, the alarm means is activated.

Therefore, in the lock brake device according to the first aspect of the present invention, when the fluid pressure detecting means detects that the brake fluid pressure acting on the brake wheel cylinder has decreased to a predetermined value or less when the lock means is operated, The control means can actuate the alarm means to warn the operator or the like that the brake actuation fluid pressure has decreased despite the lock means being activated.

According to a fourth aspect of the present invention, there is provided a lock brake device, comprising lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle.
The vehicle detection means for detecting the presence or absence of movement of the vehicle, an alarm means, and a control means, the control means, when the vehicle detection means detects the movement of the vehicle at the time of the operation of the locking means, It is configured to activate the alarm means.

Therefore, in the lock brake device according to the fourth aspect, when the vehicle detection means detects the movement of the vehicle when the lock means is activated, the control means activates the alarm means and the lock means is in operation. Nevertheless, it is possible to warn the operator that the vehicle is moving.

According to a seventh aspect of the present invention, there is provided a lock brake device, comprising lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle.
The alarm means and the control means are provided, and the control means is configured to operate the alarm means when a predetermined time has elapsed from the start of operation of the lock means.

Therefore, in the lock brake device according to the seventh aspect, when a predetermined time has elapsed from the start of the operation of the locking means, the control means actuates the alarm means to warn the operator or the like of the long-term operation of the locking means. can do.

According to the eighth aspect of the present invention, there is provided a lock brake device, wherein lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle is provided.
Fluid pressure detection means for detecting the brake actuation fluid pressure,
It has a pressurizing means for increasing the brake working fluid pressure independently of the operation of the brake pedal, and a control means, and the control means reduces the brake working fluid pressure to a predetermined value or less when the locking means is actuated. When the fluid pressure detecting means detects that this has happened, the pressurizing means is activated.

Accordingly, in the lock brake device according to the eighth aspect, when the fluid pressure detecting means detects that the brake working fluid pressure acting on the brake wheel cylinder has decreased to a predetermined value or less when the lock means is operated, The control means actuates the pressurizing means to increase the brake actuation fluid pressure and enhance the lock brake action, so that the vehicle can be reliably stopped.

A lock brake device according to an eleventh aspect of the present invention is a lock device for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, and a vehicle detection device for detecting whether or not the vehicle is moving. Means and
It has a pressurizing means for increasing the brake working fluid pressure independently of the operation of the brake pedal, and a control means, wherein the control means detects the movement of the vehicle by the vehicle detection means when the locking means is activated. When this is done, the pressing means is activated.

Therefore, in the lock brake device according to the eleventh aspect of the present invention, when the vehicle detection means detects the movement of the vehicle when the lock means is activated, the control means activates the pressurizing means to increase the brake working fluid pressure. The vehicle can be reliably stopped by strengthening the lock brake action.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the present invention shown in the drawings will be described below. 1, in the service brake of the vehicle, the hydraulic pressure generated by the driver depressing the brake pedal 1 is boosted by the brake booster 2, and the boosted brake hydraulic pressure is applied to the front-wheel normally open magnet valve 3
Is supplied to the front wheel cylinder on the front wheel side (not shown), and the boosted brake fluid pressure passes through the normally open magnet valve 4 for the rear wheel and the brake actuator 5 to the rear wheel side (not shown). The front and rear brakes (not shown) are fed to the wheel cylinders so that a braking force corresponding to the depression of the brake pedal 1 acts on the front and rear wheels of the vehicle.
The magnet valves 3 and 4 and the brake actuator 5 are controlled by the controller 30. The alternate long and short dash line in the figure represents the hydraulic system, and the broken line represents the electric signal system.

As shown in FIG. 2, in the brake actuator 5, the drive unit 10 and the casing 11 are connected to each other, and the hydraulic chamber 12 and the working chamber 13 are provided in the casing 11.
Is formed, a piston 14 is disposed in the working chamber 13, the end portion of which is slidably inserted into the hydraulic chamber 12, and the male screw 1 extending from the driving unit 10 into the working chamber 13 is formed.
5, the spacer 16 engages, and the piston 14 and the spacer 1
6, and a first compression spring 17 and a second compression spring 18 are installed between the end surface of the hydraulic chamber 12 and the end surface of the piston 14, respectively.

In the casing 11, a passage 19 connecting the normally open magnet valve 4 for the rear wheel to the hydraulic chamber 12 is provided.
And a passage 20 connecting the hydraulic chamber 12 to the rear wheel cylinder are formed, and the check ball 2 is provided in the passage 19.
1, the valve body 22 and the return spring 23 are provided, and when the piston 14 is retracted as shown in the drawing, the upper end of the valve body 22 is locked to the tip of the piston 14, and the valve body 22 is 2, the brake fluid pressure supplied to the passage 19 through the magnet valve 4 pushes the check ball 21 open, and the through hole 24 formed in the piston 14, the fluid pressure chamber 12 and It is adapted to be fed to the rear wheel cylinder via the passage 20.

On the other hand, when the brake actuator 5 is operated, the male screw 15 is rotated by the motor of the drive unit 10, and the spacer 16 engaged with the male screw 15 advances to the left in FIG. Male screw 1 by action
Since 5 can be prevented from biting into the spacer 16, the spacer 16 moves forward smoothly and, after contacting the piston 14, also moves the piston 14 integrally to the left in FIG.

For this reason, the upper end of the valve body 22 also has the piston 1
2 is displaced to the left in FIG. 2 by the tip of 4 and the valve body 22 rotates so as to be substantially perpendicular to the axis of the piston 14, the piston 14 and the check ball 21 cause the valve body 2 to move.
The vertical movement of 2 is restricted, and the passage 19 is blocked by the check ball 21.

Therefore, a high hydraulic pressure of a set value or a predetermined value or more is generated in the hydraulic chamber 12 by the pressing of the piston 14, and this is fed from the passage 20 to the rear wheel cylinder to obtain a large braking force by the rear brake. Will be done.

When the current load of the drive unit 10 exceeds the limit value due to the increase of the hydraulic reaction force acting on the drive unit 10, the electric supply to the drive unit 10 is stopped and the high brake hydraulic pressure at that time is generated. The vehicle can be reliably stopped by acting on the rear wheel cylinder, but at this time, the position of the piston 14 is fixed by the frictional force at the engaging portion between the male screw 15 and the spacer 16, so The high brake fluid pressure is maintained.

Further, when the operation of the brake actuator 5 is released, the male screw 15 is reversely rotated by the motor in the drive unit 10 and the spacer 16 is retracted to the right in FIG. The piston 14 is also rapidly retracted by the action of 18 to eliminate the high brake fluid pressure in the rear wheel cylinder, and the residual pressure is not generated in the fluid pressure chamber 12.

The controller 30 includes an operation switch 3
1, adjustment switch 32, clutch pedal stroke sensor 33, neutral switch 34, vehicle speed sensor 35,
Parking switch 36, parking stroke switch 37, stop lamp switch 38, door switch 3
9, key switch 40, lock brake operation switch 4
1, rear brake fluid pressure switch 42, front brake fluid pressure switch 43, alarm lamp 44, alarm buzzer 4
5, a parking brake lamp 46, a parking stroke lamp 47, a lock brake operation lamp 48, a lock brake lamp 49 and a horn 50 are connected to each other.

The operation switch 31 is a switch for turning on and off the operation of a slope starting assist device which will be described later, and the adjusting switch 32 is a switch for adjusting the operation of the slope starting assist device, that is, adjusting the release timing of the magnet valves 3 and 4. The clutch pedal stroke sensor 33 is for detecting when the driver depresses the clutch pedal 1 and outputting a signal, and the neutral switch 34 is for detecting this when the vehicle transmission is in a neutral state. While outputting a signal, the vehicle speed sensor 35 detects the vehicle speed, while the low vehicle speed itself is difficult to detect, as is well known, the presence or absence of movement of the vehicle can be easily detected. When the lever 60 is pulled, it detects this and outputs a signal. The door stroke switch 37 detects that the parking brake lever 60 is pulled more than a predetermined strength by the fulcrum of the parking brake lever 60 or the load applied to the parking brake wire 61. The lock brake actuation switch 41 is a switch for turning on and off the operation of a lock brake device, which will be described later, and the rear brake fluid pressure switch 42 is built in the brake actuator 5. It is to detect that the brake fluid pressure acting on the rear wheel cylinder has increased above a certain value, and the front brake fluid pressure switch 43 indicates that the brake fluid pressure acting on the front wheel cylinder has increased above a certain value. To detect the stop lamp Pitch 38 and the key switch 40 is a well known respectively, each signal to the controller 30 is output, the controller 30
As shown in FIG. 3 and below, performs the slope start assist control, parking assist control, and lock brake control based on the output signals of the sensors and switches.

The parking brake lamp 46 is turned on according to an instruction from the controller 30 in response to the output signal of the parking switch 36, and the lock brake lamp 49 is such that the hydraulic switches 42 and 43 have brake fluid pressures above a fixed value. The horn 50 is a well-known one that is always provided in the vehicle, and the alarm lamp 44, the alarm buzzer 45, the parking stroke lamp 47, and the lock brake operation lamp 48 that are controlled by the controller 30. The operation of the horn 50 will be described later.

First, the slope start assist device will be described. FIG. 4 shows a flowchart of the hill start assist control executed by the controller 30. The hill start assist device performs the following three operations in the vehicle if the operation switch 31 is turned on (step S1). When the state is detected, the operation is started (step S2). (1) When the stop lamp switch 38 detects that the brake pedal 1 is stepped on for a predetermined time (for example, 1 second) or more (step S3). (2) When the vehicle speed sensor 35 detects that the vehicle is stopped (step S4). (3) When the depression of the clutch pedal is detected by the clutch pedal stroke sensor 33 (step S
5) or when it is detected by the neutral switch 34 that the transmission is in the neutral state (step S
6).

That is, when all of the above conditions (1) to (3) are not satisfied, the slope start assist device does not operate (step S7), but all the above conditions (1) to (3) are satisfied. If the vehicle is stopped, it is determined that the vehicle is stopped, and the output signals from the controller 30 cause the magnet valves 3 and 4 to close and serve as check valves, respectively. Since the hydraulic pressure is contained as it is, the brake pedal 1
The braking force corresponding to the depression of the vehicle continues to act on the front and rear wheels, and the stopped state of the vehicle is maintained (step S8).

Therefore, when the vehicle is stopped on a slope or when the vehicle is stopped due to road congestion, the vehicle can be stopped without fail even if the brake pedal 1 is not continuously depressed.
The driver's fatigue can be easily reduced.

The hill start assist device is deactivated when any of the following two conditions in the vehicle is detected. (4) When the neutral switch 34 detects that the transmission is in a state other than neutral (step S9), and the clutch pedal stroke sensor 33 detects that the clutch pedal has returned (step S10). (5) When the parking switch 36 detects that the parking brake lever 60 is pulled (step S11).

That is, in the case of the above (4), it is judged that the driver is about to start the vehicle, and in the case of the above (5), the vehicle is held in the stopped state by the operation of the parking brake. The controller 30 outputs a control signal to the magnet valves 3 and 4 to determine that it is no longer necessary to maintain the operation of the service brake, and the magnet valves 3 and 4 are opened at the operation release timing adjusted by the adjustment switch 32. The brake fluid pressure acting on the front wheel cylinder and the rear wheel cylinder disappears.

Therefore, the driver can smoothly start the vehicle without operating the brake pedal 1 by operating the accelerator pedal and the clutch pedal, so that it is particularly easy to start the vehicle on a slope. Thus, the driving operation can be simplified, and when the vehicle is stopped for a long time due to the operation of the parking brake, the brake fluid pressure can be released to eliminate an unnecessary load on the service brake.

Further, when any of the following three states is detected during the operation of the slope start assist device,
The alarm lamp 44 and the alarm buzzer 45 are activated. (6) When it is detected by the parking switch 36 and the door switch 39 that the door on the driver's side of the vehicle is opened without the parking brake lever 60 being pulled (steps S11 and S12). (7) When the movement of the stopped vehicle is detected by the vehicle speed sensor 35 (step S13). (8) When some abnormality occurs in the system (step S14).

That is, in the above cases (6) to (8), the controller 30 outputs a control signal to the alarm lamp 44 and the alarm buzzer 45 provided near the driver's seat.
The blinking of the alarm lamp 44 and the sounding of the alarm buzzer 45 alert the driver to pulling the parking brake lever 60 or pressing the brake pedal 1 further (step S15).

Therefore, even if the vehicle frequently starts and stops, as described above, it is always possible to safely and reliably start and stop the vehicle on a slope by equipping the slope start assist device. Therefore, the driver's fatigue can be easily reduced, which is very convenient in practice.
Further, by turning off the operation switch 31, the slope start assist device can be deactivated at any time.

Next, the parking assist device will be described. FIG. 5 shows a flowchart of the parking assist control executed by the controller 30, and the parking assist device starts its operation when one of the following two states in the vehicle is detected. (9) Although the parking switch 36 detects that the parking brake lever 60 is pulled, the vehicle speed sensor 35 detects the movement of the vehicle (steps S21 and S22), and the engine operates. When the inside is detected by turning on the key switch 40 (step S23), and when the neutral switch 34 detects that the transmission is in the neutral state (step S24). (10) Although the parking switch 36 detects that the parking brake lever 60 is pulled, the vehicle speed sensor 35 detects the movement of the vehicle (steps S21 and S22), and the engine operates. When it is detected that the key switch 40 is off (step S23).

That is, except in the cases of (9) and (10) above, the pressurizing operation by the brake actuator 5 is released (step S25), but above (9) and (1).
In the case of 0), it is determined that the vehicle has started to move naturally due to the slope of the slope and the like, even though the parking brake is operated to stop the vehicle, and the brake actuator 5 is activated by the output signal from the controller 30. As described above, a high brake fluid pressure of a set value or a predetermined value or more generated in the fluid pressure chamber 12 by the pressing of the piston 14 as described above is sent to the rear wheel cylinder to increase the braking force of the rear brake. Can be surely stopped (step S26), and at the same time, the controller 3
Parking brake lamp 46 by output signal from 0
Flashes (step S27) to warn the driver of the operation of the parking assist device.

Therefore, when the vehicle is inadvertently moved due to insufficient operation of the parking brake lever 60 when the vehicle is stopped on a slope, the parking assist device can surely stop the vehicle. Therefore, the safety of the vehicle or the like can be achieved.

In the case of the above (10), when the inactivation of the engine is detected by turning off the key switch 40, the timer in the controller 30 starts operating,
If the vehicle stops and a predetermined time e.g. 1 hour elapses,
Controller 3 in response to the time-up signal from the timer
By stopping the operation of the parking assist device by 0,
The power consumption due to the long-time operation is suppressed.

In this case, since the internal structure of the brake actuator 5 is configured to maintain a high brake fluid pressure in the rear wheel cylinder, a large braking force on the vehicle disappears when the parking assist device stops operating. In addition, even if an electrical trouble such as a blown fuse in the electric circuit occurs,
Similarly, since the braking force of the vehicle does not disappear, the safety of the vehicle or the like can be ensured in any case.

The parking assist device is deactivated when one of the following two conditions in the vehicle is detected. (11) By the parking switch 36, the releasing operation of the parking brake lever 60 is continued for a predetermined number of times,
For example, when it is detected twice (step S29 and step S30). (12) The release operation of the parking brake lever 60 is detected by the parking switch 36 (step S2
9) together with the depression of the brake pedal 1, that is,
Stop lamp switch 38
When detected by (step S31).

That is, in the case of the above (11), it is determined that the driver has consciously continuously pulled the parking brake lever 60 a predetermined number of times to reliably stop the vehicle, and the above (12) In the case of, it is determined that the driver is about to start the vehicle, the operation of the brake actuator 5 is released by the output signals from the controller 30 (step S25), and the high brake fluid pressure in the rear wheel cylinders disappears. The braking force by the rear brake disappears, or the braking force according to the depression of the brake pedal 1 is applied.

Next, the lock brake device will be described. FIG. 6 shows a flowchart of the lock brake control executed by the controller 30, and the lock brake device starts the operation when the following states are detected. (13) The vehicle speed sensor 35 detects that the vehicle is stopped (step S41), the clutch pedal stroke sensor 33 detects that the clutch pedal is released (step S42), and the neutral state of the transmission is detected by the neutral switch 34. (Step S43) When the parking stroke switch 37 detects that the parking brake lever 60 is pulled to a predetermined strength or more (step S44), the lock brake actuation switch 41 is turned on (step S45). ).

That is, the parking brake lever 60
Is not detected by the parking stroke switch 37 (step S44), the parking stroke lamp 47 is turned off (step S46), and all the above conditions (13) must be satisfied. For example, the lock brake operating lamp 48 is also turned off (step S47) and the lock brake does not operate (step S48), but when the parking brake lever 60 is pulled to a predetermined strength or more as described in (13) above ( Step S44), parking stroke lamp 47
Lights up (step S49), indicating that the lock brake actuation switch 41 may be operated. Therefore, if the lock brake actuation switch 41 is turned on when the parking conditions are sufficiently adjusted (step S45). ), The magnetic valves 3, 4 depending on the output signal of the controller 30.
Are closed to serve as check valves, and the lock brake operating lamp 48 is turned on (step S50).

At this time, if a large brake fluid pressure is generated by depressing the brake pedal 1 strongly, this brake fluid pressure is sealed in the front wheel cylinder and the rear wheel cylinder by the magnet valves 3 and 4,
A strong braking force can be continuously applied to the front and rear wheels of the vehicle to lock the vehicle (step S51). If the lock braking force is insufficient, the brake fluid pressure is increased by pressing the brake pedal 1 further. It can be increased appropriately, and when the hydraulic pressure switches 42 and 43 detect that the brake hydraulic pressure has reached a certain value or more (step S52), the lock brake lamp 49 is turned on by the output signal of the controller 30 ( Step S5
3) Therefore, the driver can easily know that the vehicle is securely locked, and the lock brake lamp 49
If is turned off (step S54), the driver can easily know that the brake fluid pressure has not reached a certain value or more.

The alarm lamp 44 and the lock brake lamp 49 can be appropriately combined into one lamp, and the lock brake device has the parking brake lever 60 pulled more than a predetermined strength. Is detected by the parking stroke switch 37, it is determined that the vehicle is surely stopped, and the lock brake operation switch 41 is turned on to start the operation of the lock brake device without checking the other conditions. It is also possible to do so.

As described above, by lighting the lock brake operating lamp 48 and the lock brake lamp 49, it is shown that the lock brake device is operating and the vehicle is actively stopped, and the vehicle is traveling on a slope or the like. Even if the vehicle is stopped, is parked in a strong wind, or the load balance of the vehicle changes significantly, the movement of the vehicle is reliably stopped. It is possible to engage a stopped vehicle in various works with peace of mind.

Here, the safety control device for the lock brake will be described. FIG. 7 shows a flowchart of the lock brake safety control executed by the controller 30, which indicates that the lock brake device is operating, that is,
When the stopped vehicle is engaged in various work, the brake fluid pressure that is filled in at least one of the front wheel cylinder and the rear wheel cylinder is broken for some reason, for example, leakage of the brake fluid. If the hydraulic pressure switches 42 and 43 detect that the brake hydraulic pressure has dropped below the certain value (step S60), the alarm lamp 44 blinks by the output signal of the controller 30 and the alarm buzzer 45. Sounds,
At the same time as warning the driver of the vehicle that the lock brake force has decreased due to a decrease in brake fluid pressure,
The horn 50 sounds by the output signal of 0, and even an operator outside the vehicle can be surely warned of the decrease in the lock brake force due to the decrease in the brake fluid pressure (step S61). It is possible to promptly take measures such as increasing the brake fluid pressure to the rear wheel cylinder (step S62) to ensure the safety of workers and the like near the vehicle.

On the other hand, during the operation of the lock brake device, the decrease of the brake fluid pressure is controlled by the fluid pressure switches 42 and 43 as described above.
Is detected (step S60), the brake actuator 5 in the parking assist device starts to operate in response to the output signal of the controller 30, and as described above, the set value or a predetermined value or more generated in the hydraulic chamber 12 by pressing the piston 14 is reached. High brake fluid pressure is sent to the rear wheel cylinders to keep the braking force of the rear brake high (step S62), and the vehicle can be reliably locked, and at the same time, the parking brake is output by the output signal from the controller 30. The lamp 46 blinks (step S6
3) Display the operation of the brake actuator 5.

That is, even in an event such as a leak of bleeding of brake fluid which is usually difficult to detect early, the hydraulic pressure switches 42 and 43 can promptly detect a decrease in brake fluid pressure, and therefore an alarm is issued. By operating the lamp 44, the alarm buzzer 45, and the horn 50, and increasing the brake fluid pressure by the brake actuator 5, a warning of a decrease in the brake fluid pressure is given to the inside and outside of the vehicle, and the vehicle is reliably locked to prevent the vehicle from being in the vicinity of the vehicle. Since it is possible to easily secure the safety of the worker in, the worker can always engage in the work with peace of mind.

Further, when the lock brake device is in operation, that is, when the stopped vehicle is engaged in various works, the position of the vehicle may be slightly displaced for some reason. Is immediately detected by the vehicle speed sensor 35 (step S64), the alarm lamp 44 blinks by the output signal of the controller 30 and the alarm buzzer 45 sounds to alert the occupant in the vehicle seat of the vehicle movement. The horn 50 is sounded by the output signal of the controller 30 to surely warn an operator outside the vehicle of the movement of the vehicle (step S65). Therefore, as in the case described above, the front wheel cylinder and the rear wheel are increased by further pressing the brake pedal 1. Immediately take measures such as increasing the brake fluid pressure on the wheel cylinders to ensure the safety of workers near the vehicle It is possible to achieve.

On the other hand, when the vehicle speed sensor 35 detects the movement of the vehicle as described above during the operation of the lock brake device (step S64), the brake actuator 5 in the parking assist device starts to operate by the output signal of the controller 30, As described above, the high brake fluid pressure, which is generated in the fluid pressure chamber 12 by the pressing of the piston 14 and is equal to or higher than the set value or the predetermined value, is sent to the rear wheel cylinder to keep the braking force of the rear brake high (step S62). ), The parking brake lamp 46 blinks in response to the output signal from the controller 30 (step S63) and the operation of the brake actuator 5 is displayed at the same time that the vehicle can be reliably locked.

Therefore, also in this case, the operation of the alarm lamp 44, the alarm buzzer 45, and the horn 50, and the increase of the brake fluid pressure by the brake actuator 5,
It can warn the inside and outside of the vehicle that the brake fluid pressure is low, and can reliably stop the vehicle to easily ensure the safety of the worker in the vicinity of the vehicle, so the worker can always work with peace of mind. become able to.

Moreover, these alarm and safety devices using the hydraulic pressure switches 42 and 43 and the vehicle speed sensor 35 include the alarm lamp 44, the alarm buzzer 45, the magnet valve 3, and the like.
4 is also used as a hill start assisting device, the brake actuator 5 is also used as a parking assisting device, and the vehicle speed sensor 35 is commonly used for any of the devices. Since it is used as it is, it has a great practical advantage that the structure of the entire device can be simplified and the entire device can be constructed at low cost.

Further, when the lock brake device starts to operate, the timer built in the controller 30 starts counting, and when a relatively long predetermined time, for example, one hour has elapsed (step S66), an alarm is issued by the output signal of the controller 30. The lamp 44 blinks and the alarm buzzer 45 sounds (step S65), so that the occupant in the driver's seat of the vehicle can recognize that a predetermined time has passed since the operation of the lock brake device started, and at the same time, the output signal of the controller 30 The horn 50 sounds (step S6
5) Since the operator outside the vehicle can surely recognize that the predetermined time has passed since the operation of the lock brake device was started, the brake fluid pressure can be released by canceling the continuous long-time operation of the lock brake device. It is possible to easily avoid heavy load on the system for a long time, prevent deterioration of the rubber hose, piston cup, packing, etc. in the brake fluid pressure system, and ensure normal operation of the lock brake device. Workers in the vicinity can be protected safely.

Moreover, even in this case, since the alarm lamp 44 and the alarm buzzer 45 of the slope start assist device and the horn 50 which is always provided in the vehicle are used, the device price can be suppressed to a relatively low level. In addition, it is practical that the sound of the horn 50 is made after a lapse of a predetermined time from the start of operation of the lock brake device for a relatively short time such as one minute.

The lock brake device is released from operation when any one of the following two conditions in the vehicle is detected. (14) When the parking stroke switch 37 is turned off by releasing the parking brake lever 60 (step S55). (15) The clutch pedal stroke sensor 33 detects the depression of the clutch pedal (step S5).
6) Or, when the neutral switch 34 detects that the transmission is in a state other than neutral (step S57).

That is, in the cases of the above (14) and (15), it is determined that the various operations by the vehicle are completed and the vehicle moves, and the magnet valves 3 and 4 are opened by the output signal from the controller 30. When the brake fluid pressure in the front wheel cylinder and the rear wheel cylinder is released, and when the brake actuator 5 is in operation, the operation of the brake actuator 5 is also released at the same time, and the braking force is retained on the front and rear wheels of the vehicle. Disappears (step S48), the movement of the vehicle can be facilitated.

Although the above-mentioned slope start assist control and lock brake control are configured to operate the common magnet valves 3 and 4, as shown in FIG. 3, at least one of both controls is performed. When the operation instruction is issued from the controller 30, the magnet valves 3 and 4 are closed, and when the operation instruction is not issued from the controller 30 for both controls, the magnet valves 3 and 4 are kept open, and the parking is performed. Although the auxiliary control and the lock brake control are configured to operate the common brake actuator 5, as shown in FIG.
The operation instruction of at least one of both controls is the controller 30.
When the brake actuator 5 is pressurized, the brake actuator 5 is released from the pressurization operation.

As described above, when the hydraulic switches 42, 43 detect a decrease in the brake hydraulic pressure during the operation of the lock brake device, and / or during the operation of the lock brake device, the vehicle speed sensor 35 moves the vehicle. When it is detected, an alarm lamp 44, an output signal from the controller 30,
The alarm buzzer 45 and the horn 50 are activated to issue a warning inside and outside the vehicle, and / or when detected, the brake actuator 5 in the parking assist device is activated by the output signal of the controller 30 to secure a high braking force for the vehicle. By doing so, the safety of the worker near the vehicle can be easily achieved, and further,
After a predetermined time has passed from the start of operation of the lock brake device,
Alarm lamp 4 according to the output signal from the controller 30
4. The alarm buzzer 45 and the horn 50 are activated to give a warning to the inside and outside of the vehicle to prevent the lock brake device from operating for a long time, thereby improving the durability of the lock brake device. The safety of the operator can be easily achieved.

Further, starting assisting devices for different purposes,
By practically using common parts for the parking assistance device, the lock brake device, and the alarm device and safety device of the lock brake device, the structure of the entire device can be simplified and the cost of the entire device can be easily suppressed. There are advantages.

[0060]

As described above, according to the first aspect of the present invention,
In the described lock brake device, the fact that the pressure of the brake working fluid has decreased despite the fact that the lock means is in operation is reliably warned to the operator etc. by the operation of the alarm means. Measures such as increasing the pressure can be easily taken, and the safety of workers and the like can be improved.

Further, in the lock brake device according to the fourth aspect of the present invention, it is ensured to the operator etc. that the vehicle is moving although the lock means is in operation by the operation of the alarm means. Therefore, it is possible to easily take measures such as increasing the brake working fluid pressure, and it is possible to enhance the safety of the operator and the like.

In the lock brake device according to the seventh aspect of the present invention, the operator can be warned of the long-time operation of the lock means by the operation of the alarm means.
The durability of the lock brake device can be improved by taking measures such as stopping the operation of the lock brake device, and as a result, the safety of workers and the like can be improved.

Further, in the lock brake device according to the eighth aspect of the present invention, even if the brake working fluid pressure decreases even when the lock means is operating, the brake working fluid is actuated by the operation of the pressurizing means. Since the pressure can be increased and the vehicle can be reliably stopped, it is possible to ensure the safety of workers and the like.

Further, in the lock brake device according to the eleventh aspect of the present invention, even if the vehicle moves despite the lock means being in operation, the brake operating fluid pressure is increased by the operation of the pressurizing means. As a result, the vehicle can be stopped without fail, so that the safety of workers and the like can be ensured.

[Brief description of the drawings]

FIG. 1 is a schematic layout diagram in an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a main part of the above embodiment.

FIG. 3 is an overall control flowchart of the above embodiment example.

FIG. 4 is a main part control flowchart of the above-described embodiment.

FIG. 5 is a main part control flowchart of the embodiment.

FIG. 6 is a main part control flowchart of the above-described embodiment.

FIG. 7 is a main part control flowchart of the above-described embodiment.

[Explanation of symbols]

 1 Brake Pedal 2 Brake Booster 3, 4 Magnet Valve 5 Brake Actuator 30 Controller 31 Actuation Switch 32 Adjustment Switch 33 Clutch Pedal Stroke Sensor 34 Neutral Switch 35 Vehicle Speed Sensor 36 Parking Switch 37 Parking Stroke Switch 38 Stop Lamp Switch 39 Door Switch 40 Key Switch 41 lock brake operating switch 42, 43 hydraulic switch 44 alarm lamp 45 alarm buzzer 46 parking brake lamp 47 parking stroke lamp 48 lock brake operating lamp 49 lock brake lamp 50 horn 60 parking brake lever

Claims (14)

[Claims] 1. A lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, a fluid pressure detecting means for detecting the brake working fluid pressure, an alarm means, and a control means. The control means is configured to activate the alarm means when the fluid pressure detection means detects that the brake working fluid pressure has dropped to a predetermined value or less when the lock means is activated. 2. A parking detecting means for detecting an operating state of a parking brake in the vehicle, a vehicle detecting means for detecting whether or not the vehicle is moving, and the brake independent of an operation of a brake pedal. Pressurizing means for increasing the working fluid pressure, the control means, when the parking detection means detects the operation of the parking brake and the vehicle detection means detects the movement of the vehicle, A lock brake device configured to actuate the pressurizing means. 3. The brake pedal detecting means for detecting an operation of the brake pedal, the vehicle detecting means for detecting whether or not the vehicle is moving, and the transmission of the driving force from the engine to the traveling device are cut off. And a cutoff detecting means for detecting that the brake pedal detecting means detects the operation of the brake pedal, the vehicle detecting means detects the stop of the vehicle, and the cutoff. A lock brake device configured to actuate the locking means when the detecting means detects the cutoff state of the driving force transmission. 4. A lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, a vehicle detection means for detecting the presence or absence of movement of the vehicle, an alarm means, and a control means. The lock brake device, wherein the control means is configured to activate the alarm means when the vehicle detection means detects movement of the vehicle when the lock means is activated. 5. The parking detector according to claim 4, further comprising parking detection means for detecting an operating state of a parking brake in the vehicle, and pressurizing means for increasing the brake working fluid pressure independently of the operation of the brake pedal. A lock brake configured to operate the pressurizing means when the parking detecting means detects the operation of the parking brake and the vehicle detecting means detects the movement of the vehicle. apparatus. 6. A brake pedal detecting means for detecting an operation of a brake pedal, and a cutoff detecting means for detecting that a drive force transmission from an engine to a traveling device is in a cutoff state. When the brake pedal detecting means detects the operation of the brake pedal, the vehicle detecting means detects the stop of the vehicle, and the cutoff detecting means detects the cutoff state of the driving force transmission. A lock brake device configured to operate the locking means. 7. A lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, an alarm means, and a control means, wherein the control means has passed a predetermined time from the start of operation of the lock means. A lock brake device configured to actuate the alarm means when activated. 8. A lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, a fluid pressure detecting means for detecting the brake working fluid pressure, and the brake working fluid independent of an operation of a brake pedal. When the fluid pressure detection means detects that the brake working fluid pressure has dropped to a predetermined value or less when the lock means is activated, the control means has a pressurizing means for increasing pressure and a control means. A lock brake device configured to operate the pressurizing means. 9. The parking system according to claim 8, further comprising parking detection means for detecting an operating state of a parking brake in the vehicle, and vehicle detection means for detecting whether or not the vehicle has moved, wherein the control means comprises the parking means. A lock brake device configured to activate the pressurizing means when the detecting means detects the operation of the parking brake and the vehicle detecting means detects the movement of the vehicle. 10. The lock brake device according to claim 8 or 9, wherein the control means controls the brake working fluid pressure to become a set value or a predetermined value or more by the operation of the pressurizing means. 11. A lock means for holding a brake working fluid pressure acting on a brake wheel cylinder of a vehicle, a vehicle detecting means for detecting whether or not the vehicle is moving, and a brake working fluid independent of an operation of a brake pedal. It has a pressurizing means for increasing the pressure and a control means, and the control means operates the pressurizing means when the vehicle detection means detects the movement of the vehicle when the lock means is activated. Configured lock brake device. 12. The parking detector according to claim 11, further comprising parking detection means for detecting an operation state of the parking brake in the vehicle, wherein the control means detects the operation of the parking brake by the parking detection means, and
A lock brake device configured to activate the pressurizing means when the vehicle detecting means detects the movement of the vehicle. 13. A brake pedal detecting means for detecting an operation of a brake pedal, and a cutoff detecting means for detecting that a driving force transmission from an engine to a traveling device is in a cutoff state. When the brake pedal detecting means detects the operation of the brake pedal, the vehicle detecting means detects the stop of the vehicle, and the cutoff detecting means detects the cutoff state of the driving force transmission. A lock brake device configured to operate the locking means. 14. The lock brake device according to claim 11, wherein the control means controls the brake working fluid pressure to become a set value or a predetermined value or more by the operation of the pressurizing means. .