Multiaxial electric vehicle with hydro-pneumatic system energy storage

 

(57) Abstract:

Usage: electrical traction system vehicles articulated structures with two or more driving axles and auxiliary energy storage device, such as a hydropneumatic accumulator. The essence of the invention: a vehicle with two leading axle, one of which is equipped with a traction motor connected to the contact network through an electronic voltage regulator, suspension and brake pedal, equipped with sensors move them, set the control unit. The second bridge is equipped with a hydraulic machine type pump motor with the control mechanism of the working fluid reservoir of low-pressure hydropneumatic accumulator, electrically-controlled valve, pressure sensor and clutch. In this vehicle the efficiency of energy recovery braking and implemented Autonomous movement in the absence of a contact network or voltage in it. 2 Il.

The invention relates to electric traction systems vehicles articulated structure having two or more leading axis and standalone drive energy is applied on the trolley Italian firms "Mauri" and "Linda" [1] automated full-flow hydrostatic transmissions, built-in traction transmission and which is its complement. The main elements of the transmission are unregulated hydraulic motor axial piston type, adjustable pump of the same type, electro-hydraulic control mechanism of the pump and the computer control unit transmission. This allows to improve the dynamic performance of the trolley due to the smooth change of gear ratio of the transmission, but does not reduce specific energy consumption.

Known triaxial ZIU-B domestic production [2] the Trolley consists of two articulated sections: two-axle tractor and single axle trailer. Front and rear axles are driven with single wheels, the average bridge leading with gable wheels.

The disadvantages of this trolley is that because you have only one drive axle trolley has a small hitch weight (and therefore increased likelihood of boksovaniya wheels on snow-covered, icy or dirty road surface), the worst dynamic performance, less resource traction transmission, limiting the occupancy of the passenger compartment of the trailer with single wheels. Traction elektrodvigateley allows the braking mode to partially recover electrical energy in a contact network in the presence of at this time consumer passable trolley area of the contact network. The latter, as well as the fact that fluctuations in the contact network are randomly probable character and make unstable mode regenerative braking, limit and reduce the efficiency of recovery of electricity in real operating conditions.

Known three-axle articulated passenger trolley production Czech Republic 15 TR [3] the middle and rear axles of which are leading. Each of these bridges is equipped with a traction motor, which is controlled via an electronic voltage regulator. Due to the presence of two major bridges this trolleybus no deficiencies at the ZIU-B and noted above, but unlike the last electric trolley 15 TR does not allow you to recover energy in the contact network during braking.

The technical problem to be solved by the invention are to increase the efficiency of multi-axle vehicles and to enhance its operational capabilities. The latter is to ensure the Autonomous movement in the absence of voltage in the contact network, or when driving in areas that do not have the contact network. From what I problem is solved by in known multi-axis electric vehicle with two or more leading axle, one of which is equipped with traction lektrodvigatelem connected to the contact network through an electronic voltage regulator, suspension and brake pedal, equipped with sensors move them, according to the invention, a control unit, and the second axle is equipped with a hydraulic machine type pump motor with the control mechanism of the working fluid reservoir of low-pressure hydropneumatic accumulator, electrically-controlled valve, pressure sensor and clutch. The hydraulic machine is connected to the second axle via the clutch, the suction line of the hydraulic machine is connected with a reservoir of low pressure, and the pressure line through electrically-controlled valve is connected to a hydropneumatic accumulator and pressure sensors, displacement sensors pedals, electronic voltage regulator, and a pressure sensor connected to the input of the control unit, and outputs a control unit to control supply of the working fluid coupling, electrically-controlled valve and an electronic voltage regulator.

In Fig.1 shows the principle is leannah sections: two-axle tractor 1 and uniaxial trailer 2. On the basis of the body of the tractor 1 is live axle 3 driven in rotation of the traction motor 4 supplied from the contact network 5 via an electronic voltage regulator 6. On the basis of the body of the trailer 2 is a hydraulic machine 7 with the control mechanism 8 working fluid. The hydraulic machines 7 through the clutch 9 is connected with the axle 10 of the trailer 2. The exhaust line hydraulic machines 7 is fed to a reservoir of low pressure 11 and the pressure line through electrically-controlled valve 12 and valve 13 are connected to a hydropneumatic accumulator 14. The discharge line is equipped with two safety valves 15 and 16, located, respectively, before and after the electrically-controlled valve 12 and the pressure sensor 17. The brake pedal 18 and running the pedal 19 are connected with the sensors move them 20 and 21, respectively, brake and traction modes. The outputs of the sensors 17, 20 and 21 connected to the control unit 22. It also connected the outputs from the electronic voltage regulator 6 and the output to the electrically-controlled valve 12.

As a traction motor 4 can be used motor DK-BM, as the voltage regulator 6 thyristor regulator RT-300/BM, the motion of the brake and suspension pedals rotary transformers.

The control unit can be implemented according to the block diagram shown in Fig.2, where the block of input transducers 22 are connected to the inputs of the microcontroller 24, and a block of output transducers 25 are connected to the output of the microcontroller 24. As the microcontroller 24 can be equipped with a microprocessor company Intel or Siemiens.

The device operates as follows. During braking of the electric vehicle, asked the brake pedal 18, the sensor its provisions 20 signal to the control unit 22. The appropriate commands from the control unit 22 receives the control mechanism of the working fluid hydraulic machines 7, the electrically-controlled valve 12 and the clutch 9, which connects the hydraulic machines 7 with the axle 10 of the trailer 2. The hydraulic machines in this case works as a pump, consuming the kinetic energy of a moving mass stornaiuolo vehicle, and pumping the working fluid from the reservoir to the low pressure 11 in a hydropneumatic accumulator 14, clutching the last gas before the pickup value of the pressure sensor 17. The signal from this sensor to the control unit 22 and the corresponding commands from the latter to the electrically-controlled valve 12 6 further braking is electrodynamic and mechanical ways. When this clutch 9 disconnects the hydraulic machines 7 from the drive axle 10, and the controller 6 is connected to the contact network 5.

The acceleration of the vehicle is carried out with simultaneous parallel operation of the electric actuator (electronic voltage regulator 6 and the motor 4, the rotating axle 3 of the tractor 1) and hydraulic machines 7, the torque through the clutch 9 axle 10 of the trailer 2. Pressing chassis pedal 19 from the sensor 21 associated with the pedal, the signal to the control unit 22.

The control unit 22 generates and sends commands to the connected electronic voltage regulator 6 to contact the network 5, the electric controlled switch valve 12, to connect the clutch 9 hydraulic machines 7 to the host bridge 10 and commands to the control mechanism 8 working fluid hydraulic machines 7. At the same time the working fluid in the hydropneumatic accumulator 14 under high pressure moving in tank low pressure 11 through the hydraulic machines 7 running in this case in the mode of the motor causes the rotation and its associated drive axle 10 of the trailer 2. After use, accumulated during braking energy in hydro-pneumatic accumulat management 22 issues a command to the clutch 9, the control mechanism 8 of the working fluid to the electrically-controlled valve 12 and the voltage regulator 6, resulting in the hydraulic machines is placed into the standby mode to the operation of the pump during the next braking and subsequent acceleration and movement of the vehicle are provided with traction drive. Autonomous movement of the vehicle is carried out by rotation of the hydraulic machines 7 drive axle 10 of the trailer 2 by using the energy accumulated in the hydropneumatic accumulator 14.

Relief valves 15 and 16 provide for the drainage of fluid in the reservoir low pressure 11 of the pressure line in cases of emergency increase the pressure therein in excess of the maximum permissible value. The valve 13 is used to disable the hydropneumatic accumulator 14 from the rest of the hydraulic system in order to reduce it losses the accumulated energy with long-term Parking of vehicles. The control valve 13 is controlled manually.

Literature

1. Le trolleybus en sursis / Fvenas J./ Vie rail, 1991, N, 2267, p. 24.

2. I. S. Efremov, G. C. Kosarev. Theory and calculation of trolleybuses. Part II M High school, 1981.

3. Advertising Avenue. Sochinenii trolley TR ENT is in, with two of the leading axle, one of which is equipped with a traction motor connected to the contact network through an electronic voltage regulator, suspension and brake pedal, equipped with sensors of travel, characterized in that it is provided with a control unit, a second driving axle is equipped with a hydraulic machine type pump motor with the control mechanism of the working fluid reservoir of low-pressure hydropneumatic accumulator, electrically-controlled valve, pressure sensor and clutch, and hydraulic machine through a clutch connected to the second driving axle, suction line of the hydraulic machine is connected with a reservoir of low pressure, and pressure line through electrically-controlled valve connected with the hydro-pneumatic accumulator and pressure sensors, displacement sensors pedals, electronic voltage regulator, and a pressure sensor connected to the input of the control unit, and outputs a control unit to control supply of the working fluid coupling, electrically-controlled valve and an electronic voltage regulator.

 

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