WO2017078068A1 - 空気供給システム及び空気供給システムの制御方法 - Google Patents
空気供給システム及び空気供給システムの制御方法 Download PDFInfo
- Publication number
- WO2017078068A1 WO2017078068A1 PCT/JP2016/082605 JP2016082605W WO2017078068A1 WO 2017078068 A1 WO2017078068 A1 WO 2017078068A1 JP 2016082605 W JP2016082605 W JP 2016082605W WO 2017078068 A1 WO2017078068 A1 WO 2017078068A1
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- WIPO (PCT)
- Prior art keywords
- air
- parking brake
- valve
- air supply
- brake circuit
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/002—Air treatment devices
- B60T17/004—Draining and drying devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2259/00—Type of treatment
- B01D2259/45—Gas separation or purification devices adapted for specific applications
- B01D2259/455—Gas separation or purification devices adapted for specific applications for transportable use
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/26—Drying gases or vapours
- B01D53/261—Drying gases or vapours by adsorption
Definitions
- the present invention relates to an air supply system that controls supply and discharge of air to each load of a vehicle, and a control method for the air supply system.
- a pneumatic brake system of a vehicle air that supplies dry air to each load between a compressor that supplies compressed air and each load such as a service brake (foot brake) circuit and a parking brake circuit.
- a supply system is provided.
- the brake is activated by discharging air from the control room storing air, and the brake is released by supplying air to the control room.
- Patent Document 2 proposes a parking brake mechanism including a parking brake circuit that operates in an emergency such as when an abnormality occurs in the parking brake circuit.
- the electropneumatic parking brake circuit converts an electric signal into an air pressure signal, and activates and releases the parking brake by the air pressure signal.
- the electropneumatic parking brake circuit includes a flow path different from the parking brake circuit and a mechanism having a separate electromagnetic valve for opening and closing the flow path.
- An object of the present invention is to provide an air supply system and a control method for the air supply system in which a circuit for operating and releasing a parking brake can be used as an emergency circuit.
- An air supply system that solves the above problems includes an air supply / exhaust passage that supplies air to a parking brake circuit and exhausts air from the parking brake circuit, an air supply passage that supplies air supplied from a compressor to a load, and the supply air
- a direction switching unit connected to the exhaust path, the air supply path, and the parking brake circuit; and a control device that controls the direction switching unit.
- the control device includes a position of the direction switching unit, a supply position for allowing air supply from the air supply path to the parking brake circuit and releasing the parking brake, and the supply / exhaust from the parking brake circuit in an emergency.
- the gist of the invention is that it can be changed to an exhaust position that allows air to be discharged through the road and operates the parking brake.
- the control method of the air supply system that solves the above problem is a control method of the air supply system that supplies and exhausts air to the parking brake circuit.
- the air supply system includes: an air supply / exhaust path that supplies air to the parking brake circuit and discharges air from the parking brake circuit; an air supply path that supplies air supplied from a compressor to a load; and the air supply / exhaust path; A direction switching unit connected to the air supply path and the parking brake circuit; and a control device for controlling the direction switching unit.
- the control device includes a position of the direction switching unit, a supply position for allowing air supply from the air supply path to the parking brake circuit and releasing the parking brake, and the supply / exhaust from the parking brake circuit in an emergency. The exhaust position is changed to allow the air to be discharged through the road and activate the parking brake.
- the parking brake circuit is released when air is supplied and is activated when air is discharged.
- air is supplied to and discharged from the parking brake circuit using the air supply / exhaust passage and the direction switching unit in normal times. Further, in the event of an abnormality in the circuit or the control device, since the position of the direction switching portion becomes the exhaust position, air is discharged from the parking brake circuit via the supply / exhaust passage. This activates the parking brake. Therefore, the circuit for operating and releasing the parking brake at the normal time can also be used as an emergency circuit.
- the air supply system can be changed between an exhaust position for discharging air sent from the parking brake circuit via the air supply / exhaust path and a cutoff position for blocking the air supply / exhaust path.
- a configured discharge portion may be provided.
- the control device includes a first control device and a second control device, and the position of the direction switching unit is controlled by the second control device to become the supply position in an energized state and a non-energized state.
- the exhaust position may be obtained.
- the position of the discharge unit may be controlled by the first control device, and may be the cut-off position in an energized state and the exhaust position in a non-energized state.
- the parking brake circuit Air can be discharged from the parking brake.
- the position of the direction switching unit is in the exhaust position in the non-energized state. Therefore, if the discharge unit is de-energized by the first control device, the parking brake circuit Can be discharged.
- the parking brake can be operated even when an abnormality occurs in the first control device or the second control device, so that the system can be made redundant.
- the discharge unit may be further configured to be able to change the position to a regeneration position where the air sent from the parking brake circuit flows back to a filter provided downstream of the compressor.
- the discharge unit has a function of releasing the air from the parking brake circuit to the atmosphere and a function of causing the air from the parking brake circuit to flow back to the filter. Therefore, in addition to operating the parking brake in an emergency, the filter can be cleaned by effectively using the air from the parking brake circuit.
- the air supply system includes a supply position that supplies air to a brake circuit different from the parking brake circuit, and a bidirectional flow that allows a bidirectional flow between the parking brake circuit and the brake circuit.
- You may further provide the direction control part comprised so that a position can be changed into a position.
- the position of the direction control unit may be controlled by the first control device, and may be the bidirectional position in a non-energized state and the supply position in an energized state.
- the first control device executes a test position mode for performing a brake test by changing a position between the supply position and the bidirectional position, and when the brake circuit is released, the direction control is performed.
- the position of the part may be changed to the bidirectional position, and after the air is discharged from the brake circuit, the test position mode may be entered.
- the test position mode can be executed even when an abnormality occurs in the second control device. Further, when the test position mode is executed, when a brake different from the parking brake is released, the mode is executed after the air is discharged from the brake circuit with the position of the direction control unit as the bidirectional position. For this reason, for example, even when an operation for shifting to a test position mode is performed when a vehicle equipped with a parking brake circuit and a brake circuit is on a downhill road, the operation is shifted to the test position mode after the brake is activated, so that safety is ensured. Can be increased.
- the load is mounted on a vehicle, a supply position for supplying air to the load between the parking brake circuit and the load, and bidirectional between the parking brake circuit and the load.
- a direction control unit configured to be able to change the position to a bidirectional position that allows the flow of the above-described flow may be provided.
- the direction control unit changes the position alternately between the supply position and the bidirectional position, and the parking brake circuit It may be possible to release the parking brake by supplying air.
- the direction control unit alternately changes the position so that parking is performed from the load.
- the parking brake can be released by supplying air to the brake circuit. For this reason, the vehicle can be moved even in an emergency.
- the air supply system is connected to the air supply path for supplying air from the compressor to the parking brake circuit side, a filter provided in the air supply path, and the parking brake circuit side, and the parking brake circuit A release flow path for supplying air discharged from the discharge flow path, and a discharge section provided in the release flow path, the discharge section from the parking brake circuit when the parking brake is operated.
- the gist is that the position can be changed between a regeneration position for regenerating the filter by causing the air discharged through the path to flow back into the filter and a blocking position for blocking the release flow path.
- the filter it is possible to regenerate the filter by causing the air discharged when the parking brake is operated to flow back into the filter without being released to the atmosphere. Therefore, in addition to the regeneration of the filter by the air supplied from the parking brake circuit, when the regeneration process is executed, the air supply amount in the regeneration process or the frequency of the regeneration process can be reduced. Alternatively, when the filter is regenerated with the air supplied from the parking brake circuit while maintaining the air supply amount or frequency in the regeneration process, the filter can be further cleaned.
- the circuit for operating and releasing the parking brake can also be used as an emergency circuit.
- the brake system includes both a parking brake and a service brake as brakes using compressed dry air as a drive source.
- the connected vehicle is a vehicle in which a trailer is connected to a tractor.
- the tractor 1 that pulls the trailer 2 is provided with two wheels on the front axle WF and the rear axle WR.
- Each wheel of the front axle WF is provided with a service brake chamber 6 for operating only the service brake.
- Each wheel of the rear axle WR is provided with a spring brake chamber 7 for operating a service brake and a parking brake.
- the service brake mechanism of the service brake chamber 6 or the spring brake chamber 7 the service brake is activated when air is supplied, and the service brake is released (inactivated) when the air is discharged.
- the parking brake mechanism of the spring brake chamber 7 releases the parking brake when air is supplied, and operates the parking brake when air is discharged.
- the trailer 2 is provided with a first axle W1 and a second axle W2.
- Each wheel of the trailer 2 is provided with a spring brake chamber 7 for operating a service brake and a parking brake.
- the tractor 1 includes an engine 3, a compressor 4, and an air supply system 10.
- the compressor 4 is driven by the power of the engine 3.
- the air supply system 10 dries and cleans the compressed air supplied from the compressor 4 and supplies air to a service brake circuit including the service brake chamber 6 and a parking brake circuit including the spring brake chamber 7.
- the air supply system 10 is connected to a trailer control valve (TCV: Trailer Control Valve) 8 through a predetermined port.
- TCV Trailer Control Valve
- the trailer control valve 8 controls the supply and discharge of air to and from the pneumatic circuit of the trailer 2 to operate and release the service brake of the trailer 2 and to operate and release the parking brake of the trailer 2.
- the air supply system 10 includes a first ECU 15 as a first control device and a second ECU 16 as a second control device.
- the first ECU 15 and the second ECU 16 include, for example, a CPU, a RAM, a ROM, and the like, and control the air supply system 10 according to a program stored in the ROM or the like.
- the compressor 4 is switched between an operating state in which air is compressed and supplied and a non-operating state in which air is not compressed under the control of the first ECU 15.
- the air supply system 10 includes an air dryer circuit 11 and a protection circuit 12.
- the air dryer circuit 11 and the protection circuit 12 are connected to each other and share a part of the configuration.
- the air dryer circuit 11 is controlled by the first ECU 15 and has a function of drying the compressed air sent from the compressor 4 in the operating state.
- the air dryer circuit 11 has a function of regenerating the filter 17 for drying the air.
- the protection circuit 12 is controlled by the first ECU 15 and the second ECU 16 and has a function of supplying the air sent from the air dryer circuit 11 to the first load C21 to the eighth load C28 mounted on the vehicle.
- the protection circuit 12 is provided with a first port P21 to an eighth port P28.
- a first load C21 to an eighth load C28 are connected downstream of the first port P21 to the eighth port P28, respectively.
- the air supply system 10 is provided with a signal input port P13.
- the first ECU 15 and the second ECU 16 are connected to a network 100 such as a CAN (Controller Area Network) and configured to be able to communicate with each other.
- the first ECU 15 and the second ECU 16 can determine each other's state by communication via the network 100.
- the network 100 is connected to an operation switch 110 for parking brake. If the operation switch 110 is operated while the parking brake is in an activated state, the parking brake is released. If the operation switch 110 is operated when the parking brake is released, the parking brake is activated.
- the air dryer circuit 11 includes a filter 17 including a desiccant that captures moisture and a filtration unit that captures oil.
- the filter 17 is provided in the air supply path 18 connected to the compressor 4.
- the filter 17 removes moisture contained in the air and allows it to dry by allowing the air to pass inside, and also removes oil contained in the air and cleans the air.
- the air that has passed through the filter 17 is supplied to the protection circuit 12 side via a check valve 19 that allows only air flow downstream from the filter 17.
- a bypass flow path 20 that bypasses the check valve 19 is provided downstream of the filter 17.
- a regeneration control valve 21 is connected to the bypass channel 20.
- the regeneration control valve 21 is an electromagnetic valve controlled by the first ECU 15 and shuts off the bypass flow path 20 when not energized and opens the bypass flow path 20 when energized.
- an orifice 22 is provided between the regeneration control valve 21 and the filter 17.
- the regeneration control valve 21 When the regeneration control valve 21 is energized, the air supplied from the protection circuit 12 side is sent to the filter 17 through the bypass channel 20 with the flow rate regulated by the orifice 22.
- the air sent to the filter 17 flows backward through the filter 17. This state is called a reproduction state. Since the air sent to the filter 17 at this time passes through the filter 17 and is dry and clean air, the moisture and oil components captured by the filter 17 are removed from the filter 17.
- Drain that is a liquid containing moisture and oil removed from the filter 17 is sent to the drain discharge valve 25.
- the drain discharge valve 25 is a pneumatically driven valve that is driven by air pressure.
- the drain discharge valve 25 is provided between the filter 17 and the drain discharge port 27 and changes the position between the valve closing position and the valve opening position. Position valve.
- the drain discharge valve 25 sends drain to the drain discharge port 27 at the valve opening position.
- the drain discharged from the drain outlet 27 is collected by an oil separator (not shown).
- the drain discharge valve 25 and the compressor 4 are controlled by a governor 26.
- the governor 26 is an electromagnetic valve controlled by the first ECU 15.
- the governor 26 shuts off the control pressure (output of the air pressure signal) when not energized, and opens the air pressure signal input ports of the compressor 4 and the drain discharge valve 25 to the atmosphere.
- the governor 26 becomes a supply position for outputting an air pressure signal to the drain discharge valve 25 and the compressor 4 by the air supplied from the air supply path 18 when energized.
- the drain discharge valve 25 is maintained in the closed position in a state in which no air pressure signal is input from the governor 26, that is, in a state in which no air is supplied, and is in the valve open position when the air pressure signal is input.
- the drain discharge valve 25 is switched to the valve open position and is forcibly opened.
- the drain discharge valve 25 inputs compressed air from a test compressor different from the compressor 4 to the control port as a test signal.
- an exhaust valve 30 and at least one switching control valve 31 connected to the control port of the exhaust valve 30 are provided downstream of the filter 17.
- the exhaust valve 30 and the switching control valve 31 constitute a discharge unit and are shared between the air dryer circuit 11 and the protection circuit 12.
- the switching control valve 31 is an electromagnetic valve controlled by the first ECU 15 and is an exhaust position for discharging air on the exhaust valve 30 side in a non-energized state.
- the exhaust valve 30 is a supply position for outputting air supplied from the downstream side of the filter 17 in an energized state to the exhaust valve 30 as an air pressure signal.
- the exhaust valve 30 is a pneumatically driven three-port three-position valve that can be changed in position between an exhaust position, a shut-off position, and a regeneration position.
- the exhaust valve 30 has a spring that biases the position to the exhaust position.
- the exhaust position is a position when no air pressure signal is input from the switching control valve 31.
- the exhaust position is a position where the air sent from the fifth port P25 is discharged from the discharge port 32.
- the shut-off position is a position where the biasing force of the spring and the pressure due to the supply of air from the exhaust valve 30 are balanced. In this blocking position, communication between the fifth port P25 and the filter 17 side is blocked.
- the regeneration position is a position when an air pressure signal is input from the switching control valve 31. This regeneration position is a position where the air supplied from the fifth port P25 is supplied to the filter 17.
- a check valve 23 and an orifice 24 are provided between the exhaust valve 30 and the downstream of the filter 17.
- the check valve 23 prohibits the flow in the direction from the downstream of the filter 17 toward the exhaust valve 30 and allows the flow in the direction from the exhaust valve 30 toward the downstream of the filter 17.
- the air dryer circuit 11 includes a humidity sensor 120 and a pressure sensor 121 connected downstream of the filter 17.
- the humidity sensor 120 detects the humidity of the air downstream of the filter 17 and outputs a humidity detection value to the first ECU 15.
- the pressure sensor 121 detects the pressure downstream of the filter 17 and outputs the detected pressure value to the first ECU 15.
- the first ECU 15 estimates the volume of the drain stored in the oil separator using the humidity detection value and the pressure detection value. For example, the first ECU 15 calculates the flow rate of air passing through the filter 17 based on the pressure detection values input at predetermined intervals. Further, the first ECU 15 calculates the amount of moisture that passes through the filter 17 from the humidity detection value and the air flow rate. Then, the drain volume in the oil separator is estimated by multiplying the moisture amount by a predetermined coefficient such as a moisture capture rate of the filter 17. In addition, since the connected vehicle includes a temperature detection unit that detects the temperature of the outside air and a humidity detection unit that detects the humidity of the outside air, it is more accurate if the drain volume is calculated in consideration of the temperature and humidity of the outside air. The drain volume can be estimated.
- the first load C21 connected to the first port P21 of the protection circuit 12 and the second load C22 connected to the second port P22 are service brake circuits that operate and release the service brakes for the front wheels and the rear wheels.
- the third load C23 connected to the third port P23 is a trailer side brake circuit that operates and releases the service brake and the parking brake of the trailer 2.
- the fourth load C24 connected to the fourth port P24 and the sixth load C26 connected to the sixth port P26 are accessory circuits that activate or deactivate the accessory.
- the fifth load C25 connected to the fifth port P25 is a parking brake circuit that operates or releases the parking brake of the tractor 1.
- the seventh load C27 connected to the seventh port P27 is a circuit including a trailer control valve.
- the eighth load C28 connected to the eighth port P28 is an accessory circuit that activates or deactivates the accessory, and is a circuit that is higher in voltage than the fourth load C24 and the sixth load C26.
- the signal input port P13 is a port to which an air pressure signal that is output when a service brake operation is performed by a driver, for example, is input.
- a first branch path 41 to a sixth branch path 46 for supplying air to each load are branched.
- the first branch path 41 to the third branch path 43 are channels for supplying air to the first load C21 to the third load C23, respectively.
- the fourth branch path 44 is a flow path for supplying air to the fifth load C25.
- the fifth branch 45 is a flow path for supplying air to the fourth load C24, the sixth load C26, and the seventh load C27.
- the sixth branch passage 46 is a passage for supplying air to the eighth load C28.
- the first branch path 41 is provided with a first on-off valve 52 and a first protection valve 51 connected to the control port of the first on-off valve 52.
- the first protection valve 51 is an electromagnetic valve controlled by the second ECU 16.
- the first protection valve 51 is in a supply position when not energized and is in an exhaust position when energized.
- the first protection valve 51 communicates with the first branch passage 41 at the supply position and outputs an air pressure signal to the first on-off valve 52, and corresponds to the air pressure signal on the first on-off valve 52 side at the exhaust position. Exhaust the compressed air.
- the first on-off valve 52 is controlled by an air pressure signal from the first protection valve 51.
- the first on-off valve 52 is in a shut-off position that shuts off the supply of air from the first branch path 41 to the first load C21 when no air pressure signal is input.
- the 1st on-off valve 52 becomes a supply position which connects the 1st branch path 41 and the 1st load C21, and supplies air to the 1st load C21 in the state into which the air pressure signal was input.
- the first on-off valve 52 is provided with a bypass 53 provided with an orifice and a check valve.
- a pressure sensor 111 is connected downstream of the first on-off valve 52. The pressure sensor 111 outputs a pressure detection value to the second ECU 16.
- the second ECU 16 When the second ECU 16 detects an abnormality such as an air leak in the first load C21 based on the pressure detection value input from the pressure sensor 111, the second ECU 16 energizes the first protection valve 51 to turn on the first on-off valve 52. Close and stop supplying air to the first load C21. Further, when the pressure detection value from the pressure sensor 111 exceeds the upper limit value, the second ECU 16 energizes the first protection valve 51 to close the first on-off valve 52 and stop the supply of air to the first load C21. . Thus, even when the supply of air to the first load C21 is forcibly stopped, the air whose flow rate is reduced can be supplied downstream of the first on-off valve 52 through the bypass 53. . Therefore, a predetermined braking force can be secured even in an emergency.
- the second branch path 42 is provided with a second on-off valve 62 and a second protection valve 61 connected to the control port of the second on-off valve 62.
- the configurations of the second protection valve 61 and the second on-off valve 62 are the same as those of the first protection valve 51 and the first on-off valve 52 of the first branch passage 41.
- a second pressure sensor 112 is connected downstream of the second on-off valve 62. The second pressure sensor 112 detects the pressure downstream of the second on-off valve 62 and outputs a pressure detection value to the second ECU 16.
- the third branch path 43 is provided with a third on-off valve 72 and a third protection valve 71 connected to the control port of the third on-off valve 72.
- the third protection valve 71 is an electromagnetic valve controlled by the second ECU 16.
- the third protection valve 71 is in the exhaust position when not energized and is in the supply position when energized.
- the third protection valve 71 exhausts the air on the third on-off valve 72 side at the exhaust position, and outputs an air pressure signal to the third on-off valve 72 at the supply position.
- the third on-off valve 72 is a pneumatically driven valve, and is in a supply position when an air pressure signal is input, and is in a shut-off position when no air pressure signal is input. In the supply position, air is supplied to the third load C23 via the third port P23. In the blocking position, the third branch path 43 and the third port P23 are blocked.
- a pressure sensor 113 is connected downstream of the third on-off valve 72.
- air flow from the third on-off valve 72 to the second branch passage 42 is allowed in the flow path connecting the downstream of the third on-off valve 72 and the second branch passage 42 connected to the second load C22.
- a check valve 73 is provided.
- the service brake can be operated by supplying air from the trailer brake circuit.
- a safety valve 74 is provided downstream of the third on-off valve 72.
- the safety valve 74 is opened, and the air on the third load C23 side is discharged to the atmosphere to reduce the pressure.
- the fourth branch path 44 is provided with a direction switching valve 82 and a fifth protection valve 81 connected to the control port of the direction switching valve 82.
- the fifth protection valve 81 and the direction switching valve 82 constitute a direction switching unit.
- the fifth protection valve 81 is an electromagnetic valve controlled by the second ECU 16.
- the fifth protection valve 81 is in the exhaust position when not energized and is in the supply position when energized. At the exhaust position, the air on the direction switching valve 82 side is exhausted. Further, an air pressure signal is output to the direction switching valve 82 at the supply position.
- the direction switching valve 82 is a pneumatically driven valve, and is a three-port two-position valve connected to the fourth branch path 44, the fifth port P25 side, and the release flow path 83 connected to the exhaust valve 30.
- the direction switching valve 82 is connected to the fifth port P25 via an air supply / exhaust path 88 that supplies air to the fifth load C25 and exhausts air from the fifth load C25.
- the direction switching valve 82 is in the exhaust position when no air pressure signal is input, and is in the supply position when the air pressure signal is input. At the exhaust position, supply of air in the direction from the fifth port P25 toward the release flow path 83 is allowed. At the supply position, a flow in the direction from the fourth branch path 44 toward the fifth port P25 or the seventh port P27 is allowed.
- the fifth load C25 which is a parking brake circuit, has a control chamber that pushes back a spring that applies an urging force to the brake mechanism by air pressure.
- air is discharged from the control chamber, and the urging force of the spring is applied to the wheels.
- the parking brake is released, air is supplied to the control room and the spring is pushed back by air pressure.
- the fifth protection valve 81 of the fourth branch path 44 is in the exhaust position, and the direction switching valve 82 is in the exhaust position. Thereby, the air of the fifth load C25 is supplied to the release flow path 83 via the air supply / exhaust path 88.
- a test position valve 85 as a direction control unit is provided between the fifth port P25 and the direction switching valve 82.
- the test position valve 85 is a three-port two-position valve, and is an electromagnetic valve that is connected to the fifth port P25 side, the fifth branch passage 45 side, and the seventh port P27 and is controlled by the first ECU 15.
- the test position valve 85 is in a bidirectional position where the fifth port P25 side and the seventh port P27 side communicate with each other in the non-energized state, and is in the supply position in the energized state. In the bidirectional position, the flow in both the direction from the seventh port P27 to the fifth port P25 and the direction from the fifth port P25 to the seventh port P27 is allowed. That is, in the bidirectional position, air flows from the higher pressure to the lower pressure of the fifth port P25 and the seventh port P27. In the supply position, the flow from the fifth branch 45 to the seventh port P27 is allowed.
- a safety valve 86 is connected downstream of the direction switching valve 82.
- a shuttle valve 87 is connected between the direction switching valve 82 and the fifth port P25.
- the shuttle valve 87 has one inlet port connected to the signal input port P ⁇ b> 13 and the other inlet port connected to the direction switching valve 82 via the air supply / exhaust passage 88.
- the service brake when an operation for operating the service brake is performed, the service brake is operated while releasing the parking brake. Therefore, it is possible to prevent an excessive braking force applied to the brake mechanism or the like. Further, when air is supplied to the fifth load C25 via the air supply / exhaust passage 88, that is, when the parking brake is released, the shuttle valve 87 shuts off the signal input port P13 side. Furthermore, when the service brake is released and the air is discharged from the fifth load C25 and the parking brake is operated, the shuttle valve 87 shuts off the signal input port P13 side. As a result, the service brake is not activated even when the parking brake is activated.
- the fifth branch 45 is provided with a sixth on-off valve 92 and a sixth protection valve 91 connected to the control port of the sixth on-off valve 92.
- the configurations of the sixth protection valve 91 and the sixth on-off valve 92 are the same as the configurations of the first protection valve 51 and the first on-off valve 52 provided in the first branch passage 41.
- a channel connected to the seventh port P27 there are further branched a channel connected to the seventh port P27, a channel connected to the fourth port P24, and a channel connected to the sixth port P26.
- a test position valve 85 is provided between the sixth on-off valve 92 and the seventh port P27. Further, a safety valve 93 is connected downstream of the sixth on-off valve 92.
- the sixth branch path 46 is provided with a seventh on-off valve 102 and a seventh protection valve 101 connected to the control port of the seventh on-off valve 102.
- the configurations of the seventh protection valve 101 and the seventh on-off valve 102 are the same as the configurations of the third protection valve 71 and the third on-off valve 72.
- pressure sensors 112 to 115, 118 for detecting pressure are connected to the second port P22 to the fifth port P25 and the eighth port P28 side.
- the pressure sensors 112 to 115 and 118 output the detected pressure value to the second ECU 16.
- a pressure sensor 117 is connected downstream of the test position valve 85 and on the seventh port P27 side. The pressure sensor 117 outputs a pressure detection value to the first ECU 15.
- the air supply system 10 controls the air dryer circuit 11 and the protection circuit 12 according to the operation of a pedal for operating and releasing the service brake and an operation switch 110 for operating and releasing the parking brake.
- the air supply system 10 has a first backup mode that compensates for an abnormality in the first ECU 15 and a second backup mode that compensates for an abnormality in the second ECU 16.
- the abnormality of the first ECU 15 and the abnormality of the second ECU 16 are a state in which communication via the network 100 cannot be normally performed, a state in which each valve device cannot be normally operated, a state in which each process cannot be performed, or the like. Yes, it includes not only the ECU itself but also abnormalities of electromagnetic valves such as the governor 26 controlled by the first ECU 15 and electromagnetic valves such as the first protection valve 51 controlled by the second ECU 16.
- the first backup mode First, the procedure of the first backup mode will be described with reference to FIGS. 3 and 4 together with the procedure when the parking brake is activated and deactivated during normal operation.
- the first backup mode is premised on that no abnormality has occurred in the second ECU 16. Further, the second ECU 16 repeats the following processing at predetermined intervals.
- the second ECU 16 determines whether or not the first ECU 15 is operating normally (step S1).
- step S1 determines that the first ECU 15 is operating normally
- step S2 determines whether or not the operation switch has been operated
- step S2 determines that the operation switch 110 is not operated
- step S3 determines the state of the parking brake.
- step S3 determines that the parking brake is in an operating state (step S3: ON), it performs control for releasing the parking brake.
- the first ECU 15 energizes the switching control valve 31 to switch to the supply position (step S4). As a result, an air pressure signal is sent from the switching control valve 31 to the exhaust valve 30. At this time, the exhaust valve 30 is controlled to be in the shut-off position by controlling with the air pressure signal supplied to the exhaust valve 30 (step S5). Thereby, the release flow path 83 connected to the exhaust valve 30 is blocked.
- the second ECU 16 places the fifth protection valve 81 in the energized state and sets the supply position (step S6). Further, the direction switching valve 82 becomes a supply position by the pneumatic signal input from the fifth protection valve 81 (step S7). Thus, air is supplied to the fifth load C25, which is a parking brake circuit, via the fifth port P25.
- the second ECU 16 places the test position valve 85 in a non-energized state and sets it in a bidirectional position (step S8). As a result, air is also supplied to the seventh load C27 via the test position valve 85.
- step S3 when the second ECU 16 determines in step S3 that the parking brake has been released (step S3: OFF), the first ECU 15 places the switching control valve 31 in a non-energized state and sets the exhaust position (step S10).
- the exhaust valve 30 is in the exhaust position because air is released to the atmosphere via the switching control valve 31 (step S11).
- the second ECU 16 places the fifth protection valve 81 in a non-energized state and places it in the exhaust position (step S12). Since the air pressure signal from the fifth protection valve 81 is not input, the direction switching valve 82 is in the exhaust position (step S13). As a result, the air of the fifth load C25 passes through the release flow path 83 via the direction switching valve 82 and is discharged from the exhaust valve 30 to the atmosphere. This activates the parking brake.
- the first ECU 15 sets the test position valve 85 to the bidirectional position (step S14). Thereby, the air of the seventh load C27 is supplied to the release flow path 83 via the seventh port P27 and is discharged from the exhaust valve 30.
- the switching control valve 31 is in the non-energized state and thus is set to the exhaust position (step S20). Further, the exhaust valve 30 is set to the exhaust position (step S21), and the test position valve 85 is disposed in the bidirectional position (step S22).
- the second ECU 16 determines whether or not the operation switch 110 has been operated (step S23). When the second ECU 16 determines that the operation switch 110 has been operated (step S23: YES), it determines the parking brake state (step S24).
- step S24 When the second ECU 16 determines that the parking brake is in operation (step S24: ON), the second ECU 16 performs control for releasing the parking brake. That is, the second ECU 16 energizes the fifth protection valve 81 and sets the supply position (step S25). Further, the direction switching valve 82 is set to the supply position by the air pressure signal input from the fifth protection valve 81 (step S26). Thus, even when an abnormality occurs in the first ECU 15, air is supplied to the fifth load C25 and the seventh load C27 under the control of the second ECU 16, and the parking brake of the tractor 1 and the parking brake of the trailer 2 are released.
- step S23 when the second ECU 16 determines in step S23 that the parking brake is released (step S24: OFF), it performs control for operating the parking brake. That is, the second ECU 16 sets the fifth protection valve 81 in a non-energized state to the exhaust position (step S30), and sets the direction switching valve 82 to the exhaust position (step S31). Thus, even when an abnormality occurs in the first ECU 15, the parking brake of the tractor 1 operates.
- steps S4 and S5 may be executed after steps S6 and S7 are executed. Moreover, after performing step S12, S13, step S10, S11 may be performed and the order in particular is not ask
- This second backup mode is premised on that no abnormality has occurred in the first ECU 15. Further, the first ECU 15 repeats the process at a predetermined interval.
- the first ECU 15 determines whether or not the second ECU 16 is operating normally.
- the control of the parking brake when the second ECU 16 is operating normally is the same as the control when the first ECU 15 is operating normally.
- the first ECU 15 performs the following processing.
- the fifth protection valve 81 When the second ECU 16 is not operating normally, the fifth protection valve 81 is in the non-energized state and therefore is in the exhaust position (step S40), and the direction switching valve 82 is in the exhaust position (step S41).
- the first ECU 15 determines whether or not the operation switch 110 has been operated (step S42). If the first ECU 15 determines that the operation switch 110 is not operated (step S42: NO), the first ECU 15 ends the process. On the other hand, when determining that the operation switch 110 has been operated (step S42: YES), the first ECU 15 determines the state of the parking brake (step S43).
- the first ECU 15 determines that the parking brake is released (step S43: OFF)
- the first ECU 15 performs control for operating the parking brake. That is, the first ECU 15 puts the switching control valve 31 in the non-energized state to the exhaust position (step S44), and sets the exhaust valve 30 to the exhaust position (step S45). Therefore, even when an abnormality occurs in the second ECU 16, the air of the fifth load C25 is discharged from the exhaust valve 30 via the release flow path 83, so that the parking brake can be operated.
- the first ECU 15 sets the test position valve 85 in a non-energized state to a bidirectional position (step S46). Thereby, the brake of the trailer 2 can be operated.
- step S43 when the first ECU 15 determines that the parking brake is in operation (step S43: ON), it performs control for releasing the parking brake. That is, the first ECU 15 sets the switching control valve 31 in the energized state to the supply position (step S50), and sets the exhaust valve 30 to the cutoff position (step S51). As a result, the release channel 83 is blocked.
- the first ECU 15 energizes the test position valve 85 to set it to the supply position (step S52) and waits for a predetermined time Tm1 as it is (step S53). Thereby, air is supplied to the seventh load C27.
- the first ECU 15 energizes the test position valve 85 to set the bidirectional position (step S54) and waits for the predetermined time Tm2 as it is (step S55).
- the fixed time Tm2 may be different from or the same as the fixed time Tm1 in step S53.
- the first ECU 15 determines whether or not the pressure P5 of the fifth load C25 is equal to or higher than a certain value P based on the pressure detection value input from the fifth pressure sensor 115 (step S56). This constant value is set to the minimum pressure value necessary for releasing the parking brake. When the pressure P5 of the fifth load C25 is larger than the constant value P (step S56: YES), the parking brake is released. At this time, the first ECU 15 energizes the test position valve 85 to bring it to the bidirectional position (step S57).
- step S56 when the pressure P5 of the fifth load C25 is equal to or less than the predetermined value P (step S56: NO), the process returns to step S52, and the first ECU 15 energizes the test position valve 85 to set the supply position. That is, when an abnormality occurs in the second ECU 16, the supply of air to the seventh load C27 and the fifth load C27 to the fifth load until the pressure of the fifth load C25 exceeds a certain value P and the parking brake is released. The supply of air to the load C25 is repeated.
- step S46 you may perform step S44 and S45, and the order of each step will not be ask
- the first ECU 15 energizes the governor 26 and supplies an air pressure signal to the compressor 4 and the drain discharge valve 25. As a result, the compressor 4 enters a non-operating state, and the drain discharge valve 25 opens. Further, the first ECU 15 energizes the regeneration control valve 21 to open the bypass flow path 20. Since the first load C21 and the second load C22 side which are service brake circuits are higher in pressure than the filter 17 side, the filter is supplied from at least one of the first load C21 and the second load C22 via the regeneration control valve 21. Air is sent to 17.
- the air flows backward through the filter 17 to remove the moisture and oil components captured by the filter 17 from the filter 17 and discharges the removed moisture and oil components as drains from the drain outlet 27 together with the compressed air. Since this procedure uses at least one of the air stored in the first load C21 and the air stored in the second load C22, the air for the regeneration is sent from the compressor 4 to the first load C21 and the second load. It is necessary to supply to C22.
- the second control procedure is a procedure for sending the air sent from the fifth load C25 to the filter 17 when operating the parking brake.
- air that has been released to the atmosphere when the parking brake is operated in the past is caused to flow back to the filter 17, so that air is not stored for the purpose of regeneration only. For this reason, the load applied to the compressor 4 is reduced, and as a result, the fuel consumption of the engine 3 can be improved.
- at least the amount of oil and the amount of water removed from the filter 17 are cleaned by the regeneration process executed in the second control procedure. Since one side can be increased, the filter 17 can be further cleaned.
- the regeneration of the filter 17 according to this procedure is based on the assumption that the first ECU 15 and the second ECU 16 are operating normally. Further, the first ECU 15 repeats the following processing at predetermined intervals.
- the first ECU 15 determines whether or not the operation switch has been operated (step S60). When the first ECU 15 determines that the operation switch has been operated (step S60: YES), the first ECU 15 determines the state of the parking brake (step S61).
- step S61: OFF the first ECU 15 does not execute the regeneration process and ends the process.
- step S61 When the first ECU 15 determines that the parking brake is in an activated state (step S61: ON), the governor 26 is energized to a supply position (step S62), the compressor 4 is deactivated (step S63), and the drain is turned on.
- the discharge valve 25 is set to the discharge position (step S64).
- the second ECU 16 places the fifth protection valve 81 in the non-energized state to the exhaust position (step S65), and sets the direction switching valve 82 to the exhaust position (step S66).
- the first ECU 15 sets the test position valve 85 to the bidirectional position (step S67). Further, the first ECU 15 sets the switching control valve 31 in the energized state to the supply position (step S68), and sets the exhaust valve 30 to the regeneration position (step S69).
- the air of the fifth load C25 passes through the release flow path 83 via the direction switching valve 82 and is sent to the filter 17 via the exhaust valve 30.
- the orifice 24 is provided between the exhaust valve 30 and the downstream of the filter 17, the air whose flow rate is regulated by passing through the orifice 24 is sent to the filter 17.
- the air sent to the filter 17 flows back through the filter 17, and drain and compressed air are discharged from the drain discharge valve 25.
- the orifice 24 may be omitted when it is necessary to increase the operating speed of the parking brake.
- step S62 to step S64, step S65 to step S66, step S67, and step S68 to step S69 may be other than the above order as long as the air from the fifth load C25 can be supplied to the filter 17. It doesn't matter.
- a step of determining whether or not the compressor 4 is in a non-operating state, and a regeneration state in which compressed dry air is supplied to the filter 17 or a state in which regeneration is started It is also possible to execute at least one of the steps of determining whether or not.
- the first ECU 15 determines whether or not the compressor 4 is in a non-operating state, that is, whether or not the governor 26 is in the supply position.
- the first ECU 15 proceeds to step S65 and sets the fifth protection valve 81 to the exhaust position.
- the first ECU 15 may determine whether or not the regeneration control valve 21 is in an energized state or a state in which energization is started.
- the regeneration control valve 21 When the regeneration control valve 21 is energized, the filter 17 is in the regeneration state.
- the regeneration state here is a state in which a process for regenerating the filter 17 is performed using compressed dry air sent from a circuit other than the fifth load C25.
- the regeneration control valve 21 When the regeneration control valve 21 is energized or when energization is started, the process proceeds to step S65, and the fifth protection valve 81 is set to the exhaust position.
- the first ECU 15 performs the processing from step S65 to step S68 shown in the flowchart of FIG.
- the regeneration process may be terminated by setting the valve 30 to the exhaust position.
- Air is discharged from the fifth load C25, which is a parking brake circuit, via the supply / exhaust passage 88 that supplies air to the fifth load C25.
- supply and discharge of air to and from the fifth load C25 are performed through the fifth protection valve 81 and the direction switching valve 82.
- the supply of air to the fifth load C25 and the discharge of air are executed by a common configuration, it is possible to provide a system having a release function that deactivates the parking brake in an emergency.
- complication or enlargement of a pneumatic brake system can be suppressed.
- the test position valve 85 alternately changes the position when the parking brake is operating.
- the parking brake can be released by supplying air to the fifth load C25. For this reason, in a connected vehicle in which the parking brake is activated in an emergency, it is possible to release the parking brake and move the connected vehicle.
- the configuration of the air supply system is the same as that of the first embodiment, and a procedure for executing the test position mode in the second backup mode when an abnormality occurs in the second ECU 16 is added. This is different from the first embodiment.
- the test position mode is a mode for confirming whether or not sufficient braking force can be obtained, confirming whether or not the brake system is abnormal, confirming whether or not the brake regulations are satisfied, and the like.
- This second backup mode is premised on that no abnormality has occurred in the first ECU 15. Further, the first ECU 15 repeats the following processing at predetermined intervals.
- the fifth protection valve 81 is in the exhaust position because it is not energized (step S70), and the direction switching valve 82 is in the exhaust position (step S71).
- the first ECU 15 determines whether or not the operation switch 110 has been operated (step S72). If the first ECU 15 determines that the operation switch 110 has not been operated (step S72: NO), the first ECU 15 ends the process. On the other hand, when the first ECU 15 determines that the operation switch 110 has been operated (step S72: YES), it determines the state of the parking brake (step S73).
- the first ECU 15 determines whether or not the test signal is on (step S74).
- the driver operates the operation switch 110, another switch other than the operation switch 110, or both, or a device such as a diagnostic device, an inspection device, or an adjustment terminal connected to the network 100 is in the test position. This signal is output when the mode is executed.
- the test signal is transmitted from the operation switch 110, other switches, or the above-described devices connected to the network 100.
- step S74 NO
- the process waits for a predetermined time until the test signal is turned on (step S75).
- the first ECU 15 determines that the test signal is on (step S74: YES)
- the first ECU 15 energizes the test position valve 85 to the supply position (step S76). Thereby, the air on the fifth branch path 45 side is supplied to the seventh load C27, and the brake of the trailer 2 is released.
- the first ECU 15 determines whether or not the test signal is off (step S77). If the test signal is on (step S77: NO), the process waits for a predetermined time until the test signal is turned off (step S78). When the test signal is turned off (step S77: YES), the first ECU 15 sets the test position valve 85 to the bidirectional position (step S79). As a result, air is sent from the seventh load C27 to the exhaust valve 30, and the brake of the trailer 2 is activated.
- step S73 determines in step S73 that the parking brake has been released (step S73: OFF)
- the parking brake is operated, and then the test position mode is entered.
- the first ECU 15 places the switching control valve 31 in the non-energized state to the exhaust position (step S80), and sets the exhaust valve 30 to the exhaust position (step S81).
- the fifth protection valve 81 and the direction switching valve 82 are set to the exhaust position, so that the air of the fifth load C25 is discharged from the exhaust valve 30.
- the first ECU 15 sets the test position valve 85 in a non-energized state to a bidirectional position (step S82). Thereby, the air of the seventh load C27 is discharged from the exhaust valve 30. Thereby, the parking brake of the trailer 2 is also operated.
- the first ECU 15 waits for a predetermined time until the test signal is turned on (steps S74 and S75).
- step S74 determines that the test signal is on
- step S76 the test position valve 85 is energized to the supply position (step S76).
- step S76 the air on the fifth branch path 45 side is supplied to the seventh load C27.
- the first ECU 15 waits for a predetermined time until the test signal is turned off (step S77, step S78).
- the test signal is turned off (step S77: YES)
- the first ECU 15 sets the test position valve 85 to the bidirectional position (step S79). Thereby, the air of the seventh load C27 is discharged from the exhaust valve 30.
- the parking brake can be operated before shifting to the test position mode, so that safety is improved.
- the effects (1) to (4) can be obtained, and the following effects can be further obtained.
- the test can be performed by shifting to the test position mode.
- the continuous parking brake is activated by the control of the first ECU 15, so that safety can be improved.
- each said embodiment can also be implemented with the following forms.
- the air dryer circuit 11 may be housed in a case 207 to constitute an air dryer module 200.
- the protection circuit 12 may be housed in the case 208 to constitute the protection circuit module 201.
- a connecting portion 204 that fixes the case 207 of the air dryer module 200 and the case 208 of the protection circuit module 201 in a state of being connected to each other may be provided in at least one of the cases 207 and 208.
- the air dryer module 200 and the protection circuit module 201 are connected to each other through the piping unit 202 so that air can flow in and out, and are electrically connected.
- the piping unit 202 includes a connection unit 205 connected to the air dryer module 200 and a connection unit 206 connected to the protection circuit module 201.
- the connecting portions 205 and 206 are provided on the side surfaces of the cases 207 and 208 that are different from the side surface on which the connecting portion 204 is provided.
- a portion corresponding to the connecting portion has a function of fixing each module, a function of connecting air so as to be able to flow in and out, and a function of electrically connecting.
- the connecting portion 204 and the connecting portions 205 and 206 are separated, even if the number of units is increased, the cases are easily connected and the air is connected to each other so that air can flow in and out. Can be connected.
- the exhaust port 32 of the exhaust valve 30 may be connected to an intake port of an oil separator that stores drainage.
- the oil separator includes an oil storage chamber, and a filter that separates drain and air and cleans the air. The air separated by the filter is released to the atmosphere.
- the air sent from the fifth load C25 and input from the intake port through the exhaust valve 30 passes through the filter of the oil separator, and the drain remaining in the filter is dropped into the oil storage chamber to be filtered. To clean. In this way, the filter of the oil separator can be cleaned.
- the discharge port 32 of the exhaust valve 30, the filter 17, and the oil separator are connected by a branch path and a direction switching valve so that both the filter 17 of the air dryer circuit 11 and the filter of the oil separator can be cleaned. May be.
- the air supply system 10 may have a configuration in which the switching control valve 31 and the exhaust valve 30 are omitted.
- the direction switching valve 82 is provided with a discharge port for discharging air from the fifth load C25. Even if it is this aspect, the structure which performs a release function in an air supply system can be provided, and the complication or enlargement of a pneumatic brake system can be suppressed.
- the air supply system 10 may discharge the air sent from the fifth load C25 by a circuit different from the fifth protection valve 81 and the direction switching valve 82. Also in this case, the fifth load C25 and the exhaust valve 30 are connected via the release flow path 83. Even in this aspect, it is possible to reduce the air supply amount in the regeneration process using the air from the first load C21 and the second load C22, or the frequency of the regeneration process. Alternatively, the filter 17 can be further cleaned.
- the direction switching unit is configured by the fifth protection valve 81 and the direction switching valve 82.
- the direction switching valve 82 may be an electromagnetically controlled valve, and the direction switching unit may be configured by this valve.
- the discharge unit is configured by the switching control valve 31 and the exhaust valve 30.
- the exhaust valve 30 may be an electromagnetically controlled valve, and the discharge portion may be configured by this valve.
- the protection circuit 12 includes the first port P21 to the eighth port P28 connected to the first load C21 to the eighth load C28, but includes two or more ports including the fifth port P25. Any configuration can be used. Even in this case, the circuit for operating and releasing the parking brake at the normal time can be used as an emergency circuit.
- the air supply system has been described as being mounted on a connected vehicle including the tractor 1 and the trailer 2.
- the air supply system may be mounted on another vehicle such as a passenger car or a railway vehicle.
- Seventh protection valve, 102 ... Seventh on-off valve DESCRIPTION OF SYMBOLS 110 ... Operation switch 111-115 ... Pressure sensor 120 ... Humidity sensor 121 ... Pressure sensor 200 ... Air dryer module 201 ... Protection circuit module 202 ... Piping unit 204 ... Connection part 205 ... Connection part 206 ... Connection part, 207 ... Case, 208 ... Case, C21 to C28 ... First load to eighth load, P13 ... Signal input port, P21 to P28 ... First Over door to eighth port.
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Abstract
Description
本発明の目的は、パーキングブレーキを作動及び解除する回路を、非常時用の回路としても使用することのできる空気供給システム及び空気供給システムの制御方法を提供することにある。
図1を参照して、連結車両のブレーキシステムについて説明する。トレーラ2を牽引するトラクタ1には、前輪の車軸WF及び後輪の車軸WRに各2輪が設けられている。前輪の車軸WFの各車輪には、サービスブレーキのみを作動させるサービスブレーキチャンバー6が設けられている。後輪の車軸WRの各車輪には、サービスブレーキ及びパーキングブレーキを作動させるスプリングブレーキチャンバー7が設けられている。サービスブレーキチャンバー6、又はスプリングブレーキチャンバー7のサービスブレーキ機構は、空気が供給されるとサービスブレーキが作動し、空気が排出されるとサービスブレーキが解除(非作動)される。スプリングブレーキチャンバー7のパーキングブレーキ機構は、空気が供給されるとパーキングブレーキが解除され、空気が排出されるとパーキングブレーキが作動する。
次に図2を参照して空気供給システム10の構成について説明する。空気供給システム10は、第1制御装置としての第1ECU15、及び第2制御装置としての第2ECU16を備えている。第1ECU15及び第2ECU16は、例えばCPU、RAM、ROM等を備え、ROM等に格納されたプログラムに従って、空気供給システム10を制御する。コンプレッサ4は、第1ECU15の制御によって、空気を圧縮して供給する稼動状態と、空気の圧縮を行わない非稼動状態とが切り替えられる。
次に、エアドライヤ回路11の構成について説明する。エアドライヤ回路11は、水分を捕捉する乾燥剤及び油分を捕捉する濾過部を備えるフィルタ17を備えている。フィルタ17は、コンプレッサ4に接続する空気供給路18に設けられている。
次に、保護回路12の構成について説明する。保護回路12の第1ポートP21に接続された第1負荷C21、及び第2ポートP22に接続された第2負荷C22は、前輪及び後輪のサービスブレーキを作動及び解除するサービスブレーキ回路である。第3ポートP23に接続する第3負荷C23は、トレーラ2のサービスブレーキ及びパーキングブレーキを作動及び解除するトレーラ側ブレーキ回路である。第4ポートP24に接続する第4負荷C24及び第6ポートP26に接続する第6負荷C26は、アクセサリを作動又は非作動とするアクセサリ回路である。第5ポートP25に接続する第5負荷C25は、トラクタ1のパーキングブレーキを作動又は解除するパーキングブレーキ回路である。第7ポートP27に接続する第7負荷C27は、トレーラコントロールバルブを含む回路である。第8ポートP28に接続する第8負荷C28は、アクセサリを作動又は非作動とするアクセサリ回路であって、第4負荷C24及び第6負荷C26よりも高圧の回路である。
エアドライヤ回路11に連通する空気供給路18からは、各負荷に空気を供給する第1分岐路41~第6分岐路46が分岐している。第1分岐路41~第3分岐路43は、第1負荷C21~第3負荷C23にそれぞれ空気を供給する流路である。第4分岐路44は、第5負荷C25に空気を供給する流路である。第5分岐路45は、第4負荷C24、第6負荷C26及び第7負荷C27に空気を供給する流路である。第6分岐路46は、第8負荷C28に空気を供給する流路である。
次に、空気供給システム10の動作について説明する。空気供給システム10は、サービスブレーキを作動及び解除するためのペダルや、パーキングブレーキを作動及び解除するための操作スイッチ110の操作に応じて、エアドライヤ回路11及び保護回路12を制御する。また、空気供給システム10は、第1ECU15の異常を補う第1バックアップモード、第2ECU16の異常を補う第2バックアップモードを有している。なお、第1ECU15の異常及び第2ECU16の異常とは、ネットワーク100を介した通信が正常にできなくなった状態、各弁装置を正常に作動できなくなった状態、各処理が実行できなくなった状態等であり、ECU自体だけでなく、第1ECU15によって制御されるガバナ26等の各電磁弁や、第2ECU16によって制御される第1保護弁51等の電磁弁の異常も含む。
まず図3及び図4を参照して、通常時にパーキングブレーキが作動及び非作動とされるときの手順とともに、第1バックアップモードの手順について説明する。この第1バックアップモードは、第2ECU16に異常が生じていないことが前提となる。また、第2ECU16は、以下の処理を所定の間隔で繰り返す。
まず図5を参照して、第2バックアップモードの手順について説明する。この第2バックアップモードは、第1ECU15に異常が生じていないことが前提となる。また、第1ECU15は、当該処理を所定の間隔で繰り返す。
次にパーキングブレーキの作動時に排出される空気を利用したフィルタ17の再生処理について説明する。
第1ECU15は、テストポジション弁85を双方向位置にする(ステップS67)。また、第1ECU15は、切換制御弁31を通電状態として供給位置とし(ステップS68)、排気弁30を再生位置にする(ステップS69)。これにより、第5負荷C25の空気が、方向切換弁82を介してリリース流路83を通過し、排気弁30を介して、フィルタ17へ送られる。このとき、排気弁30とフィルタ17の下流との間には、オリフィス24が設けられているので、オリフィス24を通過することによって流量を規制された空気がフィルタ17に送られる。フィルタ17へ送られた空気は、フィルタ17を逆流し、ドレン及び圧縮空気がドレン排出弁25から排出される。なお、パーキングブレーキが作動速度を大きくする必要がある場合には、オリフィス24を省略してもよい。
なお、ステップS62~ステップS64、ステップS65~ステップS66、ステップS67、ステップS68~ステップS69の順番は、第5負荷C25からの空気をフィルタ17に供給することができれば、上記した順番以外でもよく、特に問わない。
(1)パーキングブレーキ回路である第5負荷C25からの空気の排出が、第5負荷C25に空気を供給する給排気路88を介して行われる。また、第5負荷C25に対する空気の供給及び排出は、第5保護弁81及び方向切換弁82を通じて行われる。このように、第5負荷C25に対する空気の供給及び空気の排出が共通の構成によって実行されるので、緊急時にパーキングブレーキを非作動とするリリース機能を有するシステムを提供することができる。このように空気供給システム10内にリリース機能を実行する構成を設けることによって、空気圧ブレーキシステムの複雑化、又は大型化を抑制することができる。
次に、空気供給システムの第2実施の形態を、第1実施の形態との相違点を中心に説明する。なお、本実施形態にかかる空気供給システムも、その基本的な構成は第1の実施の形態と同等であり、図面においても第1実施の形態と実質的に同一の要素にはそれぞれ同一の符号を付して示し、重複する説明は割愛する。
第1ECU15は、テスト信号がオンであると判断すると(ステップS74:YES)、テストポジション弁85を通電して供給位置にする(ステップS76)。これにより、第5分岐路45側の空気が第7負荷C27へ供給され、トレーラ2のブレーキが解除される。
(5)例えば第5保護弁81及び方向切換弁82のいずれか、又は第2ECU16が異常状態であっても、テストポジションモードに移行して、テストを実行することができる。また、テストポジションモードに移行する前には、第1ECU15の制御によって、連パーキングブレーキが作動した状態とするため、安全性を高めることができる。
なお、上記各実施の形態は、以下のような形態をもって実施することもできる。
・図8に示すように、エアドライヤ回路11は、ケース207に収容されてエアドライヤモジュール200を構成してもよい。保護回路12は、ケース208に収容されて保護回路モジュール201を構成してもよい。そして、エアドライヤモジュール200のケース207と保護回路モジュール201のケース208とを、互いに連結させた状態で固定する連結部204を、ケース207,208の少なくとも一方に設けてもよい。エアドライヤモジュール200と保護回路モジュール201とは、配管ユニット202を介して空気を流入出可能に接続されるとともに、電気的に接続される。配管ユニット202は、エアドライヤモジュール200へ接続する接続部205と、保護回路モジュール201へ接続する接続部206とを備える。接続部205,206は、ケース207,208のうち、連結部204が設けられる側面と異なる側面に設けられている。従来の構成では、連結部に相当する部分が、各モジュールを固定する機能と、空気を流入出可能に接続する機能と、電気的に接続する機能を備えていた。上記の構成では、連結部204と、接続部205,206とが分かれているため、ユニットが増えたとしても簡単に各ケースを連結するとともに、互いに空気を流入出可能に接続し、電気的に接続することができる。
Claims (7)
- パーキングブレーキ回路へ空気を供給及び前記パーキングブレーキ回路から空気を排出する給排気路と、
コンプレッサから供給される空気を負荷に供給する空気供給路と、
前記給排気路、前記空気供給路、及び前記パーキングブレーキ回路に接続する方向切換部と、
前記方向切換部を制御する制御装置と、を備え、
前記制御装置は、前記方向切換部の位置を、前記空気供給路から前記パーキングブレーキ回路への空気の供給を許容してパーキングブレーキを解除する供給位置と、非常時に前記パーキングブレーキ回路から前記給排気路を介した空気の排出を許容して前記パーキングブレーキを作動させる排気位置とに変更可能に構成される
空気供給システム。 - 前記パーキングブレーキ回路から前記給排気路を介して送られた空気を排出する排気位置と、前記給排気路を遮断する遮断位置とに位置を変更可能に構成される排出部を備え、
前記制御装置は、第1制御装置と、第2制御装置と、を備え、
前記方向切換部の位置は、前記第2制御装置によって制御され、通電状態で前記供給位置となるとともに、非通電状態で前記排気位置となり、
前記排出部の位置は、前記第1制御装置によって制御され、通電状態で前記遮断位置となり、非通電状態で前記排気位置となる
請求項1に記載の空気供給システム。 - 前記排出部は、前記パーキングブレーキ回路から送られた空気を、前記コンプレッサの下流に設けられたフィルタに逆流させる再生位置に位置を変更可能にさらに構成される
請求項2に記載の空気供給システム。 - 前記パーキングブレーキ回路とは別のブレーキ回路に空気を供給する供給位置と、前記パーキングブレーキ回路及び前記ブレーキ回路の間の双方向の流れを許容する双方向位置とに位置を変更可能に構成される方向制御部をさらに備え、
前記方向制御部の位置は、前記第1制御装置によって制御され、非通電状態で前記双方向位置となり、通電状態で前記供給位置になるとともに、
前記第1制御装置は、前記供給位置及び前記双方向位置の間で位置を変更してブレーキのテストを行うテストポジションモードを実行し、前記ブレーキ回路のブレーキが解除されている場合には、前記方向制御部の位置を前記双方向位置に変更して前記ブレーキ回路から空気を排出した後に前記テストポジションモードに移行する
請求項2又は3に記載の空気供給システム。 - 前記負荷は車両に搭載されており、前記パーキングブレーキ回路及び前記負荷の間には、前記負荷へ空気を供給する供給位置、及び前記パーキングブレーキ回路及び前記負荷の間の双方向の流れを許容する双方向位置に位置を変更可能に構成される方向制御部が設けられ、
前記空気供給システムに異常が生じ、且つ前記パーキングブレーキが作動している場合に、前記方向制御部は、前記供給位置及び前記双方向位置の間で交互に位置を変更して、前記パーキングブレーキ回路に空気を供給して前記パーキングブレーキを解除可能である
請求項1~3のいずれか1項に記載の空気供給システム。 - コンプレッサからパーキングブレーキ回路側に空気を供給する空気供給路と、
前記空気供給路に設けられたフィルタと、
前記パーキングブレーキ回路側に接続し、前記パーキングブレーキ回路から排出された空気が供給されるリリース流路と、
前記リリース流路に設けられた排出部と、を備え、
前記排出部は、パーキングブレーキが作動するときに、前記パーキングブレーキ回路から前記リリース流路を介して排出された空気を前記フィルタ内に逆流させて前記フィルタを再生する再生位置と、前記リリース流路を遮断する遮断位置とに位置を変更可能に構成される
空気供給システム。 - パーキングブレーキ回路へ空気を供給及び排気する空気供給システムの制御方法において、
前記空気供給システムは、前記パーキングブレーキ回路へ空気を供給及び前記パーキングブレーキ回路から空気を排出する給排気路と、コンプレッサから供給される空気を負荷に供給する空気供給路と、前記給排気路、前記空気供給路、及び前記パーキングブレーキ回路に接続する方向切換部と、前記方向切換部を制御する制御装置と、を備え、
前記制御装置は、前記方向切換部の位置を、前記空気供給路から前記パーキングブレーキ回路への空気の供給を許容してパーキングブレーキを解除する供給位置と、非常時に前記パーキングブレーキ回路から前記給排気路を介した空気の排出を許容してパーキングブレーキを作動させる排気位置とに変更する
空気供給システムの制御方法。
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