DE102018002616A1 - Nitrogen powered hydraulic unit with integrated Bremskraft- u. Nitrogen recovery for all power-driven vehicles that require a torque-emitting engine to drive - Google Patents

Abstract

A hydraulic unit is provided, which contains an integrated braking force and nitrogen recovery. The hydraulic unit is equipped with an evaporator (2), a storage container (1) with liquid nitrogen which is fed to the evaporator via a medium feed valve (3). 2), at least reservoirs (10, 11) connected to the gas side of the evaporator (2) via branch lines containing nitrogen (9a, 9b) and branch lines containing valves (7a, 7b) via a return line are connected to the liquid side of the evaporator (2), wherein in the branch lines of the return line between the valves (7a, 7b) and the stores (10, 11) each have a line branch to the outside air with a valve (8a, 8b) arranged therein , - A memory (12) for the braking force recovery, which with the gas side of the evaporator (2) via a valve containing branch line the nitrogen main line is connected, - a torque-releasing engine (15), - oil lines between the engine (15) and the memories (10, 11) and between the engine (15) and the memory (12) for the braking force recovery, wherein in the oil lines, a first control valve (A) for starting the engine (15) and a second control valve (B) for filling the memory (10, 11) and for filling the memory (12) for the braking force recovery located and being in the oil line between the engine (15) and the memory (12) for brake power recovery is a variable displacement pump (19) which swings to the braking force recovery depending on braking demand and oil from a surge tank (21) to the memory (12) promotes the brake power recovery and biases with working pressure , a controller including the first control valve (A), the second control valve (B) included in the branches of the main nitrogen pipe Old valves (9a, 9b), the valves contained in the branch lines of the return line (7a, 7b) and the valves contained in the line branch to the outside air (8a, 8b) controls such that

Description

Foreword:

Nitrogen and compressed air powered engines have been on the market for a long time. In order to achieve a greater range, engines have also been operated with liquid nitrogen. For this purpose, liquid nitrogen is converted via an evaporator to gas (expansion rate 1: 694 pressure / temperature depending on source: Wikipedia "liquid nitrogen") and fed to the engine, after the engine run, the nitrogen is supplied to the outside air. However, even with liquid nitrogen, the range is still too low. Similar to the electric motor, where also the range at "MINUS" temperatures, as you occur despite climate change during the winter time again and again, can be extremely short.

Hydraulic drives abound on the market, among others. for excavators, wheel loaders, tanks etc. Also recently installed in the car by the PSA Group in cooperation with Bosch / Rexroth. However, almost all hydraulic drives for operating the amount of pumping pump have a combustion engine, wherein the PSA Group additionally the energy generated during braking is also fed via a pump to a nitrogen-biased bladder accumulator. If necessary, the stored amount is directed to a hydraulic motor and the car runs hydraulically for a short time.

In the following description as well as in the enclosed functional diagram, I have assembled parts from the drives listed above and made a completely new with liquid nitrogen operated, to -30 ° C working, hydraulic drive with integrated braking force, -u. Nitrogen recovery developed.

Function Description:

From the insulated storage container ( 1 ), the liquid nitrogen (minus 196 °) passes through a medium feed valve ( 3 ) in the evaporator ( 2 ). Due to the slightly preheated ambient air around the evaporator, the liquid nitrogen expands to gas. Nitrogen on the gas side now sets the expansion rate (1: 694) and the desired working pressure. The nitrogen liquid side and the gas side are monitored by means of electronic pressure switches (4 + 5). Variations on the gas side are made with a small memory ( 6 smoothed).

On the nitrogen main line are the memory required for driving (10 + 11) and the memory required for regenerative braking ( 12 ) connected via valves and partly equipped with electronic pressure switch.

Of the memories 10 + 11 is always one in the working cycle while the other accordingly oil side is filled (they are switched to each other). After the system has been mounted over the external filling ( 17 ) was filled with BIO oil, can with the control valve "A" ( 14 ) the drive motor ( 15 ) are put into operation. For rotary motion, the traction motor on the input side, the under pressure in the memory 10 or 11 or if available from memory 12 By actuating control valve "A" BIO oil is supplied. To increase the speed, more pressurized BIO oil is supplied via the control valve. The effluent from the traction motor oil is returned via control valve "B" (16) to the correspondingly empty memory.

For nitrogen recovery is at the empty memory 10 or 11 abruptly valve 7a od. according to 7b open. The expansion pressure from the respective storage is supplied to the evaporator. At the same time during the expansion phase, a gas extraction unit could be switched on in order to recover more nitrogen. After closing valve 7a od. 7b becomes valve 8a od. 8b open to the outside air. The now nitrogen pressure unpressurized memory 10 od.11 is filled with the outgoing engine oil. The running traction motor oil is during the expansion phase with memory ( 18 ) collected, this can be omitted if instead of 2 (10 + 11) drives the power stroke with 3 memories. The oil filling the store is designed that way before storage 10 od. 11 drove completely empty the accordingly previously empty storage tank completely filled with oil and by switching on the valve 9a od. 9b is accordingly set with nitrogen under working pressure. By the mutual switching of the memory is guaranteed that always needed to drive under pressure BIO oil is available. The control valve "A" also changes the direction of rotation of the traction motor. Accordingly, you can drive forwards or backwards.

During brake power recovery, the variable displacement pump ( 19 ) depending on the brake demand and sucks out of the expansion tank ( 21 ) BIO oil and promote it to the store ( 12 ) which nitrogen side biased with working pressure on. That in memory 12 Accumulated oil is supplied to the drive motor via control valve "A". Depending on the available useful volume in memory 12 Accordingly, the emptying of memory decreases 10 or 11 ,

At memory 10 . 11 and 12 are installed to monitor the levels initiators (such as 13). All signals (Inis., EDS and control valves) are evaluated by a PLC and controlled accordingly. All pressure-leading machines Components are protected against overpressure by means of safety valves.

To compensate losses in the system is a feed pump ( 20 ) which supplies oil to the circuit via control valve "B" if required. In addition, for charging an accumulator, a small reversing pump ( 22 )assembled.

By braking force.- u. Nitrogen recovery ensures that with a filling (nitrogen liquid) the range of the drive will be sufficient (target 700-800 km per filling). Nitrogen filling stations are already available throughout Germany.

Claims (8)

Nitrogen powered hydraulic unit, which includes integrated brake and nitrogen recovery, with an evaporator (2), a supply container (1) with liquid nitrogen which is conducted via a medium feed valve (3) to the evaporator (2), at least reservoirs (10, 11) connected to the gas side of the evaporator (2) via branch lines containing nitrogen (9a, 9b) and branch lines containing the liquid side of the evaporator via return lines including valves (7a, 7b) (2) are connected, wherein in the branch lines of the return line between the valves (7a, 7b) and the stores (10, 11) each have a line branch to the outside air with a valve (8a, 8b) arranged therein, - A memory (12) for the braking force recovery, which is connected to the gas side of the evaporator (2) via a valve-containing branch line of the nitrogen main line, a torque transmitting engine (15), - Oil lines between the engine (15) and the memories (10, 11) and between the engine (15) and the memory (12) for the braking force recovery, wherein in the oil lines, a first control valve (A) for starting the engine (15 ) and a second control valve (B) for filling the reservoirs (10, 11) and for filling the memory (12) for brake force recovery and located in the oil line between the engine (15) and the memory (12) for the braking force recovery a variable displacement pump (19), which swings to the braking force recovery depending on the braking demand and oil from a surge tank (21) to the memory (12) promotes the brake force recovery and biases with working pressure, a control comprising the first control valve (A), the second control valve (B), the valves (9a, 9b) contained in the branch lines of the main nitrogen pipe, the valves (7a, 7b) contained in the branch lines of the return line and those in the Line branch to the outside air contained valves (8a, 8b) controls such that there is always one of the memory (10, 11) in the power stroke, while the other memory (10, 11) is filled on the oil side, wherein for nitrogen recovery from a memory (10, 11) the valve (7a, 7b) contained in the corresponding branch line of the return line is opened for oil-side filling of a reservoir (10, 11) after closing the valve (7a, 7b) in the corresponding branch line of the return line the valve (8a, 8 b) in the leading to the outside air line branch of the branch line of the return line is opened and to perform the power stroke in a memory (10, 11) in the memory to the corresponding he (10, 11) leading branch line of the nitrogen main line contained valve (9a, 9b) is opened, while the first control valve (A) and the second control valve (B) are actuated accordingly. Nitrogen powered hydraulic unit after Claim 1 in that the medium feed valve (3) is sized and resistant to low temperatures in its nominal size so that always enough liquid nitrogen is available to the evaporator (2), depending on the requirements of the reservoirs (10, 11). Nitrogen powered hydraulic unit after Claim 1 and 2 in which the nitrogen liquid side and the gas side are monitored by means of electronic pressure switches (4, 5) and, accordingly, the signals are evaluated by a PLC and forwarded in a controlled manner. Nitrogen powered hydraulic unit after Claim 1 - 3 , in which the memory (10, 11) are dimensioned so that a constant in their speed different Nutzvolumenentnahme guaranteed at all times. Nitrogen powered hydraulic unit after Claim 1 - 4 in which the valves 7a or 7b mounted for nitrogen recovery, including the assembled lines, and the gas exhaust unit, are dimensioned such that the expansion pressure present in the respective store (10, 11) is completely recovered. Nitrogen powered hydraulic unit after Claim 1 - 5 in which the memory (12) for the braking force recovery in the nitrogen main line is firmly integrated. Nitrogen powered hydraulic unit after Claim 1 - 6 in which everyone System conditions constantly monitored by means of initiators, electronic pressure switches or the like and accordingly the signals are further processed by a PLC. Nitrogen powered hydraulic unit after Claim 1 - 7 in that the first control valve (A) and the second control valve (B) perform a stepless control behavior in accordance with a correspondingly programmed PLC.

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