Vehicle control system and working method thereof
The application is a divisional application, and the application number 201511009469.2 of the original application is invented and named as: a vehicle gear selection and parking brake combined control system is disclosed, which is applied for the day: 2015-12-30.
Technical Field
The invention relates to the technical field of vehicle control, in particular to a vehicle gear selection and parking brake combined control system.
Background
The trailer comprises a tractor and a trailer, and some trailers need to work when parking, at the moment, the vehicle is required to be put into a neutral position, and the tractor parking brake valve is operated to carry out parking braking, in practice, parking operation is often carried out without operating the tractor parking brake valve to carry out parking braking, and at the moment, the vehicle is easy to cause accidents on a slope. In addition, when the vehicle works on a slope with a large gradient, the tractor and the trailer are required to be provided with parking brakes, so that the vehicle cannot slide down on the slope. Chinese grant publication No. CN203819220U utility model patent specification discloses a colliery is parking brake system with trailer in pit, has solved the problem that the trailer also has the braking when the tractor parks the braking, but this kind of system need set up tractor parking brake valve, gas accuse valve 10, relay valve 11, check valve 12, second gas bag 13, and generally the vehicle still need set up the select shelves operating valve, and therefore the system is comparatively complicated. In addition, the vehicle can not be braked when being parked in a neutral position, so that the potential safety hazard exists.
Disclosure of Invention
the invention aims to provide a vehicle gear selection and parking brake combined control system which has simple system and is provided with parking brakes on a tractor and a trailer when neutral is engaged.
in order to achieve the purpose, the invention adopts the following technical scheme:
The utility model provides a vehicle gear selection, parking braking combined control system includes oil tank, filter, hydraulic pump, relief valve, tractor parking brake, tractor parking pneumatic cylinder, liquid accuse pneumatic valve, gas bag, booster, characterized by: also comprises a gear selecting operation valve, a forward gear clutch, a reverse gear clutch and a shuttle valve, the hydraulic control valve, the energy accumulator, the trailer parking brake and the trailer parking hydraulic cylinder, the gear selecting operation valve comprises an operating lever, an oil inlet of the hydraulic pump is connected with an oil tank through a filter, an oil outlet of the hydraulic pump is connected with an oil inlet P port of the gear selecting operation valve, an execution port A port of the gear selecting operation valve is respectively connected with an A port of a forward gear clutch and an A port of a shuttle valve through two oil channels, an execution port B port of the gear selecting operation valve is respectively connected with a C port of a backward gear clutch and a C port of the shuttle valve through two oil channels, a B port of the shuttle valve is connected with a control port K port of the hydraulic control valve, the oil inlet P port of the hydraulic control valve is connected with a power element, the execution port A port of the hydraulic control valve is respectively connected with a control port K port of the tractor parking hydraulic cylinder and the hydraulic; an air inlet port P of the hydraulic control air valve is connected with the air bag, an execution port A of the hydraulic control air valve is connected with a booster, the booster is connected with a trailer parking hydraulic cylinder, and the trailer parking hydraulic cylinder controls a trailer parking brake to act; the operating rod of the gear selecting operating valve is connected with a gear selector in a cab through a flexible shaft.
Preferably, an oil return passage is arranged between an oil outlet of the hydraulic pump and the oil tank, and the safety valve is arranged in the oil return passage.
Preferably, the power element is an accumulator.
the invention has the following positive effects: (1) the invention can make the tractor and trailer have parking brake when the vehicle is in neutral position, so that the vehicle is not easy to have accidents when the vehicle is parked on the slope for operation; (2) the invention can realize the parking brake of the trailer when the tractor is parked and braked without arranging the parking brake valve, the pneumatic control valve, the relay valve, the one-way valve and the second air bag of the tractor, thereby simplifying the system of the vehicle.
Drawings
FIG. 1 is a hydraulic schematic of the present invention.
Detailed Description
Referring to fig. 1, the vehicle gear selection and parking brake combined control system comprises an oil tank 1, a filter 2, a hydraulic pump 3, a safety valve 4, a tractor parking brake 11, a tractor parking hydraulic cylinder 12, a hydraulic control air valve 13, an air bag 14, an assistor 15, a gear selection operation valve 5, a forward gear clutch 6, a reverse gear clutch 7, a shuttle valve 8, a hydraulic control valve 9, an energy accumulator 10, a trailer parking brake 16 and a trailer parking hydraulic cylinder 17. The select operation valve 5 includes an operating lever 5-1.
An oil inlet of a hydraulic pump 3 is connected with an oil tank 1 through a filter 2, an oil outlet of the hydraulic pump 3 is connected with an oil inlet P port of a gear selecting operation valve 5, an execution port A port of the gear selecting operation valve 5 is respectively connected with an advancing gear clutch 6 and an A port of a shuttle valve 8 through two oil channels, an execution port B port of the gear selecting operation valve 5 is respectively connected with a backing gear clutch 7 and a C port of the shuttle valve 8 through two oil channels, a port B of the shuttle valve 8 is connected with a control port K port of a hydraulic control valve 9, an oil inlet P port of the hydraulic control valve 9 is connected with an energy accumulator 10, an execution port A port of the hydraulic control valve 9 is respectively connected with a parking hydraulic cylinder 12 and a control port K port of a hydraulic control air valve 13 through two oil channels, and the parking hydraulic cylinder 12 controls a parking brake 11 of a tractor. An air inlet port P of the hydraulic control air valve 13 is connected with the air bag 14, an execution port A of the hydraulic control air valve 13 is connected with the booster 15, the booster 15 is connected with the trailer parking hydraulic cylinder 17, and the trailer parking hydraulic cylinder 17 controls the action of the trailer parking brake 16. The operating lever 5-1 of the gear selecting operating valve 5 is connected with a gear selector in a cab through a flexible shaft, and the operating gear selector enables the operating lever 7-1 to move up and down through the flexible shaft.
An oil return channel is arranged between the oil outlet of the hydraulic pump 3 and the oil tank 1, and a safety valve 4 is arranged in the oil return channel.
When the vehicle needs to go forward, the driver operates the gear selector in the cab to make it in the forward gear, the port P of the gear selecting operation valve 5 is communicated with the port A of the execution port, the forward gear clutch 6 is in the combination state, the power shaft is combined with the forward shaft, and the vehicle can go forward. Meanwhile, pressure oil enters a control port K of the hydraulic control valve 9 through a port A of the shuttle valve 8, an oil inlet P of the hydraulic control valve 9 is communicated with an execution port A, the pressure oil of the energy accumulator 10 enters a tractor parking hydraulic cylinder 12 through the hydraulic control valve 9 to push a moving plate and a static plate in a tractor parking brake 11 to be separated, and the tractor parking brake is released. Meanwhile, pressure oil enters a control port K of the hydraulic control air valve 13 to push the hydraulic control air valve 13 to act, a port P of the hydraulic control air valve 13 is communicated with a port A, air in the air bag 14 enters the booster 15 through the hydraulic control air valve 13 to push hydraulic oil to enter the trailer parking hydraulic cylinder 17, so that a moving plate and a static plate in the trailer parking brake 16 are separated, and the parking brake of the trailer is released.
When the vehicle needs to move backwards, the driver operates the gear selector in the cab to make the gear selector in the reverse gear, the port P of the gear selecting operation valve 5 is communicated with the port B of the execution port, the reverse gear clutch 7 is in a combined state, the power shaft is combined with the reverse shaft, and the vehicle can move backwards. Meanwhile, pressure oil enters a control port K of the hydraulic control valve 9 through a port B of the shuttle valve 8, an oil inlet P of the hydraulic control valve 9 is communicated with an execution port A, the pressure oil of the energy accumulator 10 enters a tractor parking hydraulic cylinder 12 through the hydraulic control valve 9 to push a moving plate and a static plate in a tractor parking brake 11 to be separated, and the tractor parking brake is released. Meanwhile, pressure oil enters a control port K of the hydraulic control air valve 13 to push the hydraulic control air valve 13 to act, a port P of the hydraulic control air valve 13 is communicated with a port A, air in the air bag 14 enters the booster 15 through the hydraulic control air valve 13 to push hydraulic oil to enter the trailer parking hydraulic cylinder 17, so that a moving plate and a static plate in the trailer parking brake 16 are separated, and the parking brake of the trailer is released.
when the vehicle needs to be parked, the driver operates the gear selector in the cab to be in a neutral position, the port P of the gear selection operation valve 5 is not communicated with the ports a and B, the forward clutch 6 and the reverse clutch 7 are both in a separated state, and the vehicle cannot move forward or backward. Pressure oil does not enter a control port K of the hydraulic control valve 9 through a port A or a port B of the shuttle valve 8, at the moment, an oil inlet P of the hydraulic control valve 9 is not communicated with an execution port A, the pressure oil of the energy accumulator 10 cannot enter a parking hydraulic cylinder 12 of the tractor through the hydraulic control valve 9, a moving plate and a static plate in the parking brake 11 are combined under the action of spring force, and the parking brake of the tractor is activated. Meanwhile, no pressure oil enters the control port K of the hydraulic control air valve 13, the port P and the port A of the hydraulic control air valve 13 are not communicated, air in the air bag 14 cannot enter the booster 15 through the hydraulic control air valve 13, no hydraulic oil enters the trailer parking hydraulic cylinder 17, the moving plate and the static plate in the trailer parking brake 16 are combined under the action of the spring force, and the trailer parking brake is also activated.