Mobile working machine

Abstract

The invention relates to a mobile working machine (1000), comprising: - an electric traction drive (100) for moving the mobile working machine (1000), - a traction battery (101) for supplying the electric traction drive (100), - an electric component drive (200) for driving at least one working machine component (201), - a component battery (202) for supplying the electric component drive (200), and - a coupling device (300, 301) which, when necessary, supplies the electric component drive (200) from the traction battery (101) as well.

Description

[0001] Mobile work machine

[0002] The invention is based on the objective of providing a mobile working machine that can be operated as energy-efficiently as possible.

[0003] The mobile working machine has an electric traction drive for moving the mobile working machine, for example in the form of or comprising one or more electric motors.

[0004] The mobile work machine also features a traction battery for the electrical supply of the electric traction drive.

[0005] The mobile working machine further comprises an electric component drive for powering at least one working machine component, for example in the form of one or more electric motors. The component drive is separate from the traction drive.

[0006] The mobile work machine also features a component battery for electrically supplying the electric component drive.

[0007] The mobile work machine also features a coupling device that additionally supplies the electric component drive from the traction battery as needed.

[0008] In one embodiment, the at least one working machine component is a hydraulic pump.

[0009] In one embodiment, the mobile work machine further comprises: a traction DC link, in particular a traction DC link, wherein the traction DC link is supplied from the traction battery and powers the electric traction drive, and a component DC link, in particular a component DC link, wherein the component DC link is supplied from the component battery and powers the electric component drive. The coupling device includes a unidirectional or bidirectional DC / DC converter, which is connected between the traction DC link and the component DC link and which, as required, also supplies the component DC link and / or the electric component drive from the traction DC link.In one embodiment, the mobile work machine has a mains connection for connection to a DC power grid and / or an AC power grid, wherein the component battery can be charged from the AC power grid and / or the electrical component drive can additionally be supplied from the DC power grid and / or the AC power grid.

[0010] In one embodiment, the traction battery has a larger storage capacity than the component battery, for example, a storage capacity 4 times to 50 times greater.

[0011] In one embodiment, the traction battery has a storage capacity between 250 kWh and 2000 kWh, and the component battery has a storage capacity between 7 kWh and 200 kWh, in particular between 7 kWh and 100 kWh.

[0012] In one embodiment, the mobile working machine has an Electric Power Take Off (e-PTO) to which electrical energy is supplied from the traction battery, wherein the coupling device can be electrically coupled to the e-PTO.

[0013] In one embodiment, the intermediate circuit of the components has a supply power of at least 80 kW, in particular at least 150 kW.

[0014] In one embodiment, the upper voltage level of the two intermediate circuits, which may depend on the state of charge of the associated batteries, is at a similar level, and in particular differs by no more than a factor of 2. The voltage level may, for example, be between 100 V and 1000 V, and in particular between 400 V and 800 V.

[0015] In one embodiment, the mobile work machine is a truck-mounted concrete pump.

[0016] The invention is described in detail below with reference to the drawings. These show:

[0017] Fig. 1 schematically shows a block diagram of a mobile working machine according to a first embodiment,

[0018] Fig. 2 shows a schematic block diagram of a mobile working machine according to a second embodiment, Fig. 3 shows a schematic block diagram of a mobile working machine according to a third embodiment and

[0019] Fig. 4 shows a schematic block diagram of a mobile working machine according to a fourth embodiment.

[0020] Fig. 1 shows a highly schematic block diagram of a mobile working machine 1000 in the form of a truck-mounted concrete pump according to a first embodiment.

[0021] The components outlined above are typical of a work machine base or truck, and the components outlined below are typical of the structure of the work machine base or truck.

[0022] The mobile working machine 1000 comprises: an electric traction drive 100 in the form of an electric motor for moving the mobile working machine 1000, a traction battery 101 for supplying the electric traction drive 100, an electric component drive 200 for driving at least one working machine component 201 in the form of a hydraulic pump, a component battery 202 for supplying the electric component drive 200, and a coupling device in the form of a DC / DC converter 300 and a contactor 301, which also supply the electric component drive 200 from the traction battery 101 as required or depending on the control signal.

[0023] The traction drive or electric motor 100, for example, drives an axle 106.

[0024] The mobile working machine 1000 further comprises: a traction intermediate circuit 102, wherein the traction intermediate circuit 102 is supplied from the traction battery 101 and supplies the electric traction drive 100 via an inverter 103 of the mobile working machine 1000, and a component intermediate circuit 203, wherein the component intermediate circuit 203 is supplied from the component battery 202 and supplies the electric component drive 200 via an inverter 206 of the mobile working machine 1000.

[0025] A DC / DC converter 204 of the mobile working machine 1000 is connected between the component battery 202 and the component intermediate circuit 203.

[0026] The mobile work machine 1000 further features: a first mains connection 107 for connection to a DC power network and / or an AC power network 104 and a downstream rectifier 105. The mobile work machine 1000 further features an Electric Power Take Off (e-PTO) 400, to which electrical energy from the traction battery 101 is supplied.

[0027] The DC / DC converter 300 and the contactor 301 are connected in series via the e-PTO 400 between the traction DC link 102 and the component DC link 203 and supply the component DC link 203 and / or the electric component drive 200 from the traction DC link 102 as required.

[0028] In its first switching position, the contactor 301 connects the DC / DC converter 300 to the rectifier 105, allowing electrical power from the DC or AC power grid 104 to be transferred to the traction DC link 102, for example, to charge the traction battery 101. In its second switching position, the contactor 301 connects the DC / DC converter 300 to the e-PTO 400, allowing the component DC link 203 and / or the electric component drive 200 to also be powered from the traction DC link 102.

[0029] The mobile work machine 1000 further features a second mains connection 500 for connection to a second DC power supply and / or a second AC power supply 600 and an optional downstream rectifier 205, so that the component battery 202 can also be charged from the second DC power supply and / or the second AC power supply 600 and / or the electric component drive 200 can also be supplied from the second DC power supply and / or the second AC power supply 600.

[0030] The traction battery 101 has a significantly larger storage capacity than the component battery 202. For example, the traction battery 101 can have a storage capacity between 250 kWh and 2000 kWh, while the component battery 202 can have a storage capacity between 7 kWh and 200 kWh, particularly between 7 kWh and 100 kWh.

[0031] The intermediate circuit component 203 has a supply power of at least 80 kW, in particular at least 150 kW. The supply power here is, for example, the power available to supply the electric motors.

[0032] The embodiment shown in Fig. 2 differs from the embodiment shown in Fig. 1 in that the rectifier 205 and the DC / DC converter 204 are replaced by several so-called on-board chargers (OBCs) 205'. In addition to rectifying, the OBCs 205' also enable level adjustment of the rectified voltage to match the operating voltage of the component battery 202.

[0033] The embodiment shown in Fig. 3 differs from the embodiment shown in Fig. 2 in that the rectifier 105 is replaced by an OBC 105' which directly feeds the traction intermediate circuit 102, and the contactor 301 is omitted.

[0034] The embodiment shown in Fig. 4 differs from the embodiment shown in Fig. 3 in that the DC / DC converter 300 is arranged after the e-PTO or on the working machine structure.

[0035] In modern electric trucks, the traction drive is increasingly integrated into a rear axle, rendering the traction drive unusable for mechanical power take-off. Electric component drives for concrete pumps still require peak power outputs that conventional electric power take-off (e-PTO) systems cannot provide. This is where the invention comes in.

[0036] The machine according to the invention comprises a traction battery and at least one component battery. The traction battery is typically part of the truck and supplies its traction or drive system. The component battery is typically part of the vehicle body and drives one or more hydraulic pumps.

[0037] At least one DC / DC converter is connected between the traction battery and the component battery, capable of transferring electrical power from the traction battery to the component battery, typically between 20 and 80 kW. The DC / DC converter also connects the two intermediate circuits. Ideally, it is bidirectional.

[0038] The setup shown below can include an AC or DC power supply from a power grid, which can directly drive the component drive and / or charge the component battery.

[0039] The traction battery may also have a separate charging option from the mains electricity supply.

Claims

Patent claims 1. Mobile working machine (1000), comprising: an electric traction drive (100) for moving the mobile working machine (1000), a traction battery (101) for supplying the electric traction drive (100), an electric component drive (200) for driving at least one working machine component (201), a component battery (202) for supplying the electric component drive (200), and a coupling device (300, 301) which supplies the electric component drive (200) from the traction battery (101) as required.

2. Mobile working machine (1000) according to claim 1 , characterized in that the at least one working machine component (201) is a hydraulic pump.

3. Mobile working machine (1000) according to one of the preceding claims, characterized in that the mobile working machine (1000) further comprises: a traction intermediate circuit (102), wherein the traction intermediate circuit (102) is supplied from the traction battery (101) and supplies the electric traction drive (100), and a component intermediate circuit (203), wherein the component intermediate circuit (203) is supplied from the component battery (202) and supplies the electric component drive (200), wherein the coupling device comprises a DC / DC converter (300) which is connected between the traction intermediate circuit (102) and the component intermediate circuit (203) and which supplies the component intermediate circuit (203) and / or the electric component drive (200) from the traction intermediate circuit (102) as required.

4. Mobile working machine (1000) according to one of the preceding claims, characterized in that the mobile working machine (1000) has a mains connection (500) for connection to a DC power supply and / or an AC power supply (600), wherein the component battery (202) can be charged from the AC power supply (600) and / or the electrical The component drive (200) can also be supplied from the DC power grid and / or the AC power grid (600).

5. Mobile working machine (1000) according to one of the preceding claims, characterized in that the traction battery (101) has a larger storage capacity than the component battery (202).

6. Mobile working machine (1000) according to one of the preceding claims, characterized in that the traction battery (101) has a storage capacity between 250 kWh and 2000 kWh and the component battery (202) has a storage capacity between 4 kWh and 200 kWh, in particular between 7 kWh and 100 kWh.

7. Mobile working machine (1000) according to one of the preceding claims, characterized in that the mobile working machine (1000) has an Electric Power Take Off (e-PTO) (400) to which electrical energy from the traction battery (101) is supplied, wherein the coupling device (300) can be electrically coupled to the e-PTO (400).

8. Mobile working machine (1000) according to one of claims 3 to 7, characterized in that the component intermediate circuit (203) has a supply power of at least 80 kW, in particular at least 150 kW.

9. Mobile working machine (1000) according to one of the preceding claims, characterized in that the mobile working machine (1000) is a truck-mounted concrete pump.

10. Mobile working machine (1000) according to one of claims 3 to 9, characterized in that the traction intermediate circuit (102) and the component intermediate circuit (203) each have an intermediate circuit voltage between 100 V and 1000 V, in particular between 400 V and 800 V.

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