JP2001026265A - Brake device circuit of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve braking responsiveness of a service brake without damaging an auxiliary braking mechanism even in a braking device having an auxiliary braking mechanism. SOLUTION: This brake device circuit includes a brake valve 4 for regulating the pressure of air from an air tank 5 to braking signal pressure according to an actuating amount of a brake pedal 6, relay valves 11, 12 disposed on the downstream thereof for regulating the pressure of air from the air tank to the braking output pressure, a first supply line r1 formed by providing a first one-way route c1 of a double check valve 21 in the midway between an outline 14a of the relay valve 12 and a wheel cylinder 3 provided corresponding to wheels, valve devices 23, 24 for regulating the pressure of air from the air tank 5 to the auxiliary braking output pressure according to an auxiliary braking signal output by an auxiliary braking control device 49, and a second supply line for connecting the valve device 23, 24 to the wheel cylinder 3 through a second one-way route c1 of the double check valve 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle brake device circuit, and more particularly to a vehicle in which a brake valve and a wheel-side brake actuator are connected via a brake signal pressure circuit, a relay valve, and a brake operation pressure circuit. A brake device circuit.

[0002]

2. Description of the Related Art In a braking device for a vehicle, a braking pressure generated when a driver depresses a brake valve is passed through a braking circuit to a wheel cylinder which is a braking actuator disposed in correspondence with each wheel. Transmitted, whereby each wheel cylinder is configured to apply a braking force to each corresponding wheel. By the way, the load capacity of commercial vehicles varies greatly, and it is effective to increase or decrease the braking force on the rear wheel side in accordance with the load capacity in order to ensure traveling safety.

[0003] For example, a braking device for a commercial vehicle shown in FIG.
A brake valve 101 for supplying high-pressure air from an air tank 100 is provided. A first output port of the brake valve is connected to a brake signal pressure circuit 102 on the front wheel side, and a second output port is connected to a brake signal pressure circuit 103 on the rear wheel side. Connecting.
The front and rear brake signal pressure circuits 102 and 103 are connected to front and rear relay valves 104 and 105, respectively. The front and rear relay valves 104 and 105 receive a supply of high-pressure air from the air tank 100 and supply braking air pressures corresponding to the braking signal pressure to the wheel cylinders 106 of the front and rear and left and right wheels, respectively. In addition, ABS control valves 107 and 108 are provided in front of the wheel cylinders 106 for the front and rear wheels, respectively, thereby preventing wheel lock for each wheel.

[0004] The braking signal pressure circuit 103 on the rear wheel side includes a valve 109 for holding a braking force (hereinafter referred to as an EZGO valve), an LSV valve 110 for adjusting the rear wheel braking force according to the load, and a double check. The valve 111 is connected to the relay valve 105 in this order, and the other input port of the double check valve 111 is connected to the LSV valve 110 by which the ASR valve 112 for generating a braking signal pressure corresponding to the braking force for spin prevention at start is provided. And are connected in parallel. The relay valve 105 is configured to regulate high-pressure air from the air tank 100 to a braking operation pressure according to a braking signal pressure and to supply the adjusted pressure to the rear wheel-side ABS control valve 108 side.

[0005] In this braking system, the EZGO valve 109 operates to hold the braking pressure when the vehicle is in the braking force holding range when the rear wheel is stopped.
The R valve 112 operates to apply a braking force. At the time of normal braking, a braking operation pressure equivalent to a braking signal pressure adjusted according to the loaded state is supplied from the relay valve 105 to each wheel cylinder 106 on the rear wheel side, and an appropriate braking force is applied to the rear wheel side. I have.

[0006]

By the way, in a braking device having an LSV and an auxiliary braking device as shown in FIG. 6, when a braking force is applied to the rear wheels, a brake valve 101 is provided.
From the brake signal reaches the relay valve 105 via the EZGO valve 109, the LSV valve 110, and the double check valve 111. When a large number of valve devices are provided in the brake signal pressure circuit, the flow path resistance is reduced. Thus, there arises a problem that the braking response is deteriorated. The present invention has been made in view of the above problems, and has as its object to provide a vehicle brake device circuit that can improve braking response without receiving unnecessary flow path resistance during normal braking.

[0007]

In order to achieve the above object, according to the first aspect of the present invention, a brake valve regulates air from an air tank to a braking signal pressure in accordance with an amount of depression of a brake pedal. A relay valve arranged downstream of the valve regulates air from the air tank to a braking output pressure in accordance with the braking signal pressure, and is provided corresponding to an output line of the relay valve and wheels by a first supply line. A first one-way path of a double check valve is provided in the middle of the brake actuator, and air from an air tank is adjusted to an auxiliary brake output pressure in response to an auxiliary brake signal output by an auxiliary brake control device by a valve device; The valve device is connected to the braking actuator via a second one-way path of the double check valve by the supply line. As described above, the valve device that performs the pressure adjustment operation in response to the braking signal from the auxiliary brake control device on the service brake line that reaches the brake actuator from the brake valve via the first one path of the relay valve and the double check valve is eliminated. Since the valve device is provided on the second supply line connected to the second one-way of the double check valve, the flow resistance of the service brake line is reduced, and the braking response is improved. There is an advantage that the brake actuator can be easily operated with the auxiliary brake output pressure.

According to a second aspect of the present invention, in the vehicle brake device circuit according to the first aspect, the valve device outputs an ASR valve that outputs an auxiliary braking signal for preventing spin when the vehicle starts, and a braking force when the vehicle starts on a slope. It is characterized in that an EZGO valve with a relay valve for outputting an auxiliary braking signal for holding control is connected in series. With this configuration, at the time of ASR operation, the auxiliary braking output pressure is regulated by the EZGO valve with the relay valve based on the auxiliary braking signal input from the ASR valve to the EZGO valve with the relay valve, and the braking is performed via the second one-way. Output to the actuator, and the brake actuator can be easily operated.
AS relay valve of EZGO valve with relay valve
Can also be used for R control.

[0009]

FIG. 1 shows a brake of a vehicle according to the present invention.
1 shows a brake device 1 to which a device circuit is applied;
The parking device 1 is a left front shaft pivotally supported by a front shaft of a vehicle (not shown).
Right wheel W_FL, W _FRAnd left and right rear wheels W pivoted to the rear shaft_RL, W
_RRAre respectively braked. Front shaft left and right wheels W_FL, W_FRTo
Wheel cylinder 2 as braking actuator is provided opposite
After the working fluid is supplied to both wheel cylinders 2.
The aforementioned front wheel braking line R1 is connected. Rear axle left and right wheels
W_RL, W_RRHas a wheel system as a braking actuator.
A working flow is applied to both wheel cylinders 3.
A rear wheel braking line R2 described later for supplying the body is connected.

A brake valve 4 of the brake device 1 receives air supply from an air tank 5 which is a high-pressure air source.
The air of the braking signal pressure according to the amount of depression of the brake pedal 6 operated by the driver is transmitted to the front and rear relay valves 11 and 12 via the first front and rear air pipes 7 and 8. Front relay valve 1
Reference numeral 1 denotes an ABS control valve 1 in which high-pressure air from an air tank 5 is supplied via a front second air pipe 13 and a control output pressure corresponding to the air of a braking signal pressure from a brake valve 4 is provided.
Tell 5 The ABS control valve 15 is connected to a braking controller 16 having a function as a control means of the ABS control device.
The control output pressure is increased or decreased according to the control signal and transmitted to the front and left air masters 76, where the boosted control output pressure is transmitted through the front oil pipe 117 to the front left and right wheels W _FL and W _FR . It is supplied to each wheel cylinder 2 and an appropriate braking force is applied.

The rear relay valve 12 is supplied with high-pressure air from the air tank 5 through the rear second air pipe 14, and supplies a control output pressure corresponding to the braking signal pressure air from the brake valve 4 to the ABS control valve 17. Tell ABS
The control valve 17 is connected to the braking controller 16, and increases or decreases the control output pressure in accordance with the ABS control signal from the controller 16, and transmits this to the air master 18, which boosts the braking operation hydraulic pressure. Is the rear oil pipe 1
9 to the wheel cylinders 3 of the rear left and right wheels W _RL , W _{RR to apply} an appropriate braking force.

Between the brake valve 4 of the rear first air pipe 8 and the rear relay valve 12, an LSV valve 20 for adjusting the rear wheel braking force according to the load of the vehicle is interposed. A double check valve 21 is interposed between the control valve 17 and the ABS control valve 17. The LSV valve 20 is mounted so as to detect the vertical interval between the unsprung member and the sprung member of the vehicle, and adjusts the operation signal pressure to the rear relay valve 12 according to the vertical interval. As a result, in order to secure the braking force when the vehicle is loaded with a large load,
A large braking force is secured for the front and rear wheels, and when the load is small, the braking force for the rear wheel is reduced to prevent locking of the wheels.

A double check valve 21 is connected to one input port of the output line 14 a downstream of the rear second air pipe 14.
Is connected to an output line 22a downstream of the rear third air pipe 22, which will be described later, to the other input port, and an ABS control valve 17 is connected to the output port. The double check valve 21 is connected to the output line 14a via the ABS.
A first one-way c1 that allows only the flow to the control valve 17 and a second one-way c2 that allows only the flow from the output line 22a to the ABS control valve 17 are formed, and these two ones can be opened alternately. Is formed. Here, a first one-way c1 is
And a part reaching the wheel cylinder 3 as a braking actuator provided corresponding to the wheel constitutes a first supply line r1. The EZGO valve 23 described later corresponds to the wheel via a second one-way c2. A portion reaching the wheel cylinder 3 as a provided brake actuator forms a second supply line r2.

The third air pipe 22 is moved from the air tank 5 to the EZ.
It reaches the GO valve 23. EZGO as a valve device
The valve 23 has a relay valve, and is connected in series with an ASR valve 24 as another valve device on an auxiliary braking signal pressure line d. The EZGO valve 23 is connected to a braking controller 16 having a braking force holding control function when the vehicle starts on a slope having a braking force holding control function, and the control output pressure is controlled in accordance with an auxiliary braking signal for braking force holding control from the controller 16. Is transmitted to the subsequent ABS control valve 17 and air master 18, where the boosted braking hydraulic pressure is applied to each wheel cylinder 3 of the rear left and right wheels W _RL , W _RR via the rear oil pipe 19. The braking force is supplied when the vehicle is started on a slope.

As shown in FIGS. 2 to 4, the EZGO valve 23 has an EZGO control unit 26 mounted on an upper part of a housing 25 and a relay valve part 27 mounted on a lower part. The EZGO control unit 26 includes a solenoid 28, a movable iron core 29 below the solenoid 28, a switching valve 30 driven by the movable iron core, and a movable iron core 29.
And a spring 54 that presses the switching valve 30 to the normally open position N1 (the position indicated by the solid line in FIG. 2) via the switch. Here, the solenoid 28 opens the passage of the exhaust side valve seat 31 when pressing the switching valve 30 to the closed position N1 via the movable iron core 29 in response to the auxiliary braking signal for maintaining the braking force from the braking controller 16. As a result, a region from the valve chamber 32 to the pressurizing chamber 33 described later is opened to the atmosphere via the open path 34. On the other hand, when the switching valve 30 is switched to the open position N2 (the position indicated by the solid line in FIG. 4) above the closed position N1, the exhaust side valve seat 31 is closed and the passage 3 of the high pressure side valve seat 35 is closed.
51 is opened, whereby the space from the valve chamber 32 to the pressurizing chamber 33 communicates with the rear third air pipe 22 through the high-pressure branch 36.

The relay valve portion 27 is provided with two upper and lower upper pistons 37 and a lower piston 38 slidably arranged in the center of the housing 25 so as to be vertically slidable, and a valve operating portion 381 integrated with the lower piston 38 can be pressed downward. Deployed, pressure regulating chamber 42
, A valve base 40 that supports the relay valve body 39 so as to be slidable up and down, and a lower end supported by the valve base 40 and an upper end of the relay valve body 39 in the valve-closing direction that is upward. And a spring 41 for pressing. In addition,
Reference numeral 43 denotes an exhaust valve which releases the air pressure of the output line 22a to the atmosphere through the passage 39 'when the solenoid 28 is switched from ON to OFF. Further, the code 5
Reference numeral 5 denotes a return spring that presses the upper piston 37 and the lower piston 38 upward.

Here, the high pressure air is introduced into the pressure regulating chamber 42 through the rear third air pipe 22 to the relay valve body 39, and the air flows out of the outlet chamber 46 above the valve seat 45 with which the relay valve body 39 contacts. And is connected to the subsequent ABS control valve 17 via the output line 22a following the outflow chamber 46. The pressurizing chamber 33 of the upper piston 37 communicates with the valve chamber 32, and the pressurizing chamber 47 of the lower piston 38 is connected in series to the ASR valve 24 on the auxiliary braking signal pressure line d. When high-pressure air is supplied to at least one of the two pressurizing chambers 33 and 47, that is, the EZGO control unit 2
When the auxiliary braking signal pressure generated by the solenoid ON operation of No. 6 is supplied to the pressurizing chamber 33 of the upper piston 37 or the auxiliary braking signal pressure from the ASR valve 24 is supplied to the pressurizing chamber 47 of the lower piston 38, the relay valve is activated. to go into. In this case, the relay valve body 39 is separated from the valve seat 45 in conjunction with the upper piston 37 and the lower piston 38, and the high-pressure air in the pressure regulating chamber 42 flows to the outflow chamber 46 as the braking output pressure in accordance with the degree of throttle. Can be supplied to the ABS control valve 17 via the output line 22a and the second one-way path c2 of the double check valve 21.

The ASR valve 24 has an operation control unit 24
1 is connected to the ASR control controller 49, and the input port of the pressure adjusting unit 242 communicates with the air tank 5 and the output port communicates with the lower piston 38 side of the EZGO valve 23 via the auxiliary braking signal pressure line d. ASR control controller 4
9 operates the ASR valve 24 so that the anti-spin braking force at the time of starting is applied to the rear left and right wheels W _RL and W _RR as driving wheels, and the ASR valve 24 applies an auxiliary braking signal to the auxiliary braking signal pressure line d. Output pressure. The auxiliary braking signal pressure from the ASR valve 24 is applied to the lower piston 3 in the relay valve section 27.
The brake output pressure is supplied to the pressurizing chamber 47 of FIG.

The brake controller 16 is formed by a microcomputer, and its main part is formed by a microcomputer. Each wheel speed sensor provided on the input side of the front left and right wheels W _FL and W _FR and the rear left and right wheels W _RL and W _RR. Each wheel speed Vw is inputted from 50, and in addition, a braking operation signal (brake signal) Sb, an accelerator opening degree θa, a clutch sensor signal C / L, a vehicle speed signal V, a gear position signal T / M, a side signal are outputted from a brake sensor 51. The brake signal Sbs and the like are input. Braking controller 16
Has a well-known antilock control function, an EZGO control function, and an ASR control function.

Hereinafter, the operation of the brake device 1 to which the air-over-hydraulic brake circuit of FIG. 1 is applied will be described together with the control function of the braking controller 16. First, a case where a normal brake operation is performed will be described. First, the high-pressure air in the air tank 5 is regulated in accordance with the amount of depression of the brake pedal 6, and the regulated air is further loaded by the LSV 20 into the loaded state of the vehicle. After the pressure is adjusted accordingly, it is input to the control valve 12 as a signal pressure. The control valve 12 regulates the pressure of the high-pressure air in the air tank 5 in accordance with the signal pressure and supplies the high-pressure air to the upstream of the double check valve 21. At this time, since the output line 22a in the supply line R2 does not operate the ASR valve 24 and the EZGO valve 23, the air pressure output from the control valve 12 is equal to the double check valve 21 and the ASR valve.
The air is supplied to the air master 18 via the valve 17, and is transmitted to the wheel cylinder 3 while being controlled by the hydraulic pressure.

Next, when the vehicle is stopped by a brake operation in the middle of a hill, if the operating conditions of the hill start assist device are satisfied based on the signals such as the brake signal sb, the vehicle speed signal V, and the side brake signal Sbs, the EZGO valve 23 Is activated by receiving a signal from the controller 16, and the air pressure of the air tank 5 is increased by the third air pipe 22, the EZGO valve 23, the output line 22a, the double check valve 21, the ASR valve 17
Is supplied to the air master 18 via the. At this time, the braking pressure is held by the air pressure from the output line 14a side by the brake operation until the operating condition of the slope start assist device is satisfied just before and after the vehicle stops, and when the operating condition is satisfied, the air from the EZGO valve is released. The pressure acts on the double check valve 21 to switch the braking pressure supplied to the air master 18 to the air pressure from the supply line 22a. As a result, even if the driver stops depressing the brake pedal, the braking pressure is retained by the line r2 and functions as a slope start assist device.

Further, when the controller 49 detects the slip of the rear wheel based on the output of the wheel speed sensor, A
The SR valve 24 receives the output signal of the controller 49, regulates the high-pressure air in the air tank 5, and supplies the signal pressure to the relay valve section 25 of the EZGO valve 23, so that the high-pressure air in the air tank is supplied to the third air pipe 22. E
Air master 1 via ZGO valve 23, output line 22a, double check valve 21, ASR valve 17
8 and is converted into a hydraulic pressure and transmitted to the wheel cylinder 3. In this way, wheel slippage is prevented.

As described above, the EZGO valve 23 is eliminated from the service brake line downstream of the brake valve 4, and the EZGO valve 23 is connected to the second one-way path c of the double check valve.
2, the flow resistance of the service brake line is reduced and the braking responsiveness is improved, and each wheel cylinder 3 is driven by the auxiliary braking output pressure of the EZGO valve 23. Can be easily operated. In the above description, the brake device 1 is mounted on a vehicle having one rear axle. However, the brake device 1 can be applied to a vehicle having two rear axles. In this case, the same operation and effect as the brake device 1 of FIG. 1 can be obtained.

[0024]

As described above, according to the first aspect of the present invention, the auxiliary brake control device is provided on the service brake line which reaches the brake actuator from the brake valve via the first one path of the relay valve and the double check valve. The valve device that adjusts the pressure in response to the braking signal is eliminated,
Since the valve device is provided on the second supply line connected to the second one-way of the double check valve, the flow resistance of the service brake line is reduced, and the braking response is improved. There is an advantage that the brake actuator can be easily operated with the auxiliary brake output pressure.

According to the second aspect of the present invention, the auxiliary braking output pressure is adjusted by the EZGO valve with the relay valve based on the auxiliary braking signal input from the ASR valve to the EZGO valve with the relay valve during the ASR operation. Can be output to the braking actuator via the EZGO with a relay valve.
A relay valve of the valve can also be used for ASR control.

[Brief description of the drawings]

FIG. 1 is an overall schematic configuration diagram of a brake device to which a vehicle brake device circuit of the present invention is applied.

2 is an EZGO valve used in the brake device of FIG. 1, and is a cross-sectional view taken along line XX of FIG.

3 shows an EZGO valve used in the brake device of FIG. 1, and is a sectional view taken along line YY of FIG.

FIG. 4 is a side sectional view of the EZGO valve used in the brake device of FIG. 1 during EZGO operation.

FIG. 5 is a plan view of an EZGO valve used in the brake device of FIG.

FIG. 6 is a schematic diagram of a conventional brake device circuit of a vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brake apparatus 3 Wheel cylinder 4 Brake valve 5 Air tank 6 Brake pedal 11, 12 Relay valve 14a Output line 21 Double check valve 23 EZGO valve 24 ABS control valve 49 ASR control controller c1 First one way c2 Second one way r1 Second 1 supply line r2 2nd supply line

Claims (2)

[Claims] 1. A brake valve for regulating air from an air tank to a braking signal pressure in accordance with an amount of depression of a brake pedal, and a brake valve disposed downstream of the brake valve for braking air from the air tank in accordance with the braking signal pressure. A relay valve for regulating the output pressure, a first supply line provided with a first one-way path of a double check valve in the middle of an output line of the relay valve and a braking actuator provided corresponding to a wheel; A valve device for adjusting the air from the air tank to an auxiliary braking output pressure in accordance with an auxiliary braking signal output by the control device, and a second device for connecting the valve device to the brake actuator via a second one-way path of the double check valve. And a supply line for the vehicle. 2. The brake device circuit according to claim 1, wherein the valve device outputs an ASR valve for outputting an auxiliary braking signal for preventing spinning when the vehicle starts, and an auxiliary for holding braking force control when starting on a slope. E with relay valve to output braking signal
A brake device circuit for a vehicle, comprising a ZGO valve connected in series.