Charging device and procedure

Abstract

Loading device (1) designed in the form of a roller test stand with driven rollers (2) for charging an electrical energy storage device in a motor vehicle (4), in particular in an electric or hybrid vehicle, so that the electrical energy storage device of a motor vehicle (4) parked on it and connected to the vehicle wheels (3) of an axle via the rollers (2) is charged via its alternator or an electric motor of the motor vehicle (4) designed as a generator, characterized by, a detection / control device (5) which, depending on the vehicle type of the motor vehicle (4), determines the alternator or electric motor used and ascertains an optimal recuperation range and thus an optimal speed range for the alternator or electric motor used, wherein the detection / control device (5) furthermore detects current state variables of the electrical energy storage device and controls or regulates a drive device for driving the rollers (2) in such a way that it drives the rollers (2) according to the optimal recuperation power of the alternator or electric motor and while adhering to current limit values ​​of the electrical energy storage device, a holding device for fixing the motor vehicle (4) during loading, which is designed in the form of folding wedges that stand up and form a wedge shape when the motor vehicle (4) drives over them with its vehicle wheels (3) and thereby fixes the motor vehicle (4).

Description

[0001] The present invention relates to a charging device designed in the form of a roller test bench. The invention also relates to a method for charging an electrical energy storage device in a motor vehicle.

[0002] With growing environmental awareness, electric vehicles are gaining attention due to their low emissions. However, a disadvantage of all currently available electric vehicles is that they can only be charged at specially designed charging stations. It is crucial to ensure a correct electrical connection at these charging stations to prevent damage. A particular drawback of existing charging stations and devices is the need for additional electrical components in the electric vehicle, such as a charger and charging socket. Furthermore, differing charging interfaces and standards present additional challenges.

[0003] A charging device of this type is known from JP 2010 - 57 286 A.

[0004] US patent 2008 / 0297109A1 discloses a charging device for charging an electrical energy storage device in a motor vehicle, which has driven rollers so that the electrical energy storage device of a motor vehicle parked on it is charged via its alternator or an electric motor of the motor vehicle designed as a generator. The charging device further includes a control unit that drives the rollers.

[0005] Further prior art is known from EP 0 246 595 A1, DE 88 13 662 U1 and JP 2007 - 116 755 A.

[0006] From DE 199 44 691 A1 a test procedure is known in which an electric hybrid vehicle is placed in a driving state on a roller test bench, vehicle end data are acquired by accessing sensors in the vehicle and test bench end data are acquired by measurements on the roller test bench, and the vehicle end data and the dynamometer end data are analyzed for checks of a drive and a control system of the vehicle.

[0007] The present invention therefore deals with the problem of providing a charging device with which an electrical energy storage device of a motor vehicle, for example an electric or hybrid vehicle, can be charged, regardless of the charging interface standard used and additional charging-related electrical components.

[0008] This problem is solved according to the invention by the subject matter of the independent claims. Advantageous embodiments are the subject matter of the dependent claims.

[0009] The present invention is based on the general concept of designing a charging device for charging an electrical energy storage device in a motor vehicle, for example in an electric or hybrid vehicle, in the form of a roller test bench, so that to charge the energy storage device, the respective motor vehicle only needs to be driven onto the roller test bench and subsequently, the required charging voltage is generated by an alternator or an electric motor of the motor vehicle acting as a generator via driven rollers of the charging device. For this purpose, the motor vehicle is connected to the rollers via its wheels on one axle in a force-transmitting manner, wherein the rollers of the charging device designed as a roller test bench are driven, so that the charging of the electrical energy storage device in the motor vehicle can be carried out simply via the drive of the rollers and thus via the alternator or the electric motor of the motor vehicle.In comparison to previous charging stations or charging devices, the charging device designed as a roller test stand enables vehicle-independent charging and is therefore particularly flexible in its application.

[0010] In the solution according to the invention, a detection / control device is provided that detects the maximum recuperation power of the alternator or electric motor and controls or regulates a drive unit for driving the rollers of the charging device in such a way that it drives the rollers according to the optimal recuperation power of the alternator or electric motor and while adhering to the current limits of the electrical energy storage device. Each alternator or each electric motor operating as a generator delivers optimal electrical power within a specific speed range, which, however, varies depending on the speed and the specific alternator or electric motor. The detection / control device provided according to the invention is capable of, for example, adjusting the control unit based on the vehicle type to the specific alternator or electric motor used.The system adjusts the speed of the electric motor used to drive the rollers in such a way that the alternator or electric motor operates in its optimal recuperation range, i.e., at its optimal speed. This allows for particularly fast and efficient charging of the vehicle's electrical energy storage system.

[0011] In an advantageous embodiment of the solution according to the invention, the loading device includes a holding device for securing the motor vehicle. Such a holding device is designed in the form of folding wedges that unfold and form a wedge shape when the motor vehicle drives over them with its wheels, thereby securing the vehicle. The holding device primarily serves to secure the motor vehicle during the loading process.

[0012] Ideally, each loading device is equipped with four rollers, at least two of which are driven. Of course, a loading device with only two rollers is also conceivable, in which case each roller makes contact with the vehicle wheel to be driven at only one contact edge. If, however, four rollers are provided per loading device, two rollers are assigned to each vehicle wheel, so that the corresponding vehicle wheel can be driven solely by the two rollers and, for example, simultaneously locked in place using its parking brake. It is conceivable that either all rollers are driven by a corresponding drive unit or only one roller per vehicle wheel. Naturally, loading devices with eight rollers are also possible, at least four of which are driven, particularly for all-wheel-drive vehicles.

[0013] Further important features and advantages of the invention will become apparent from the dependent claims, the drawing and the associated description of the figures based on the drawing.

[0014] It is understood that the features mentioned above and those to be explained below can be used not only in the combinations specified, but also in other combinations or on their own, without leaving the scope of the present invention.

[0015] A preferred embodiment of the invention is shown in the drawing and is explained in more detail in the following description.

[0016] The only Fig. Figure 1 shows a charging device according to the invention.

[0017] According to the Fig. Figure 1, a charging device 1 according to the invention, has driveable rollers 2 which are connected to the vehicle wheels 3 of an axle of a motor vehicle 4 parked thereon. The vehicle wheel 3, which is connected to the driven rollers 2 during charging, is driven by the driven rollers 2, and this drive powers an unspecified alternator or an electric motor of the motor vehicle 4 designed as a generator. In general, the motor vehicle 4 can also be designed as a hybrid or electric vehicle, in the latter case where the electric motor used for propulsion during driving is used as a generator during charging.

[0018] Furthermore, a detection / control device 5 can be provided which detects the maximum recuperation power of the alternator or the electric motor operating as a generator and current state variables of the electrical energy storage device, such as its state of charge, and controls or regulates a drive device for driving the rollers 2, while adhering to the current limit values ​​of the electrical energy storage device of the vehicle 4, such that it drives the rollers 2 according to the maximum recuperation power of the alternator or the electric motor. Each alternator or each electric motor functioning as a generator has a range of optimal recuperation power, for example, an optimal recuperation speed, so that for fast and effective charging of the energy storage device of the vehicle 4, operating the alternator or the electric motor in its optimal recuperation range is of great advantage.

[0019] In general, the loading device 1 can also include a holding device for securing the motor vehicle 4 during charging. Securing the motor vehicle 4 can, of course, also be achieved via its parking brake. Furthermore, the driven rollers 2 are preferably profiled to ensure the best possible power transmission to the vehicle wheels 3.

[0020] According to the Fig. In the example shown, two rollers 2 are provided for each vehicle wheel 3, at least one of which is driven. It is also conceivable, in principle, that only a single driven roller 2 is provided for each vehicle wheel 3. However, providing two rollers 2 for each vehicle wheel 3 offers the significant advantage that the vehicle wheel, and thus the motor vehicle 4, stands securely in the recess formed by the two rollers 2.

[0021] To charge the energy storage system of the motor vehicle 4, the vehicle is simply driven onto the rollers 2 of the charging device 1 with the corresponding vehicle wheels 3, and the rollers 2 are driven, thereby charging the energy storage system of the motor vehicle 4 via the alternator or an electric motor operating as a generator. A particular advantage of the charging device 1 according to the invention is that it can be used universally and flexibly for almost all hybrid or electric vehicles without requiring special and, in particular, individual adaptations to specific vehicle types.

Claims

[1] Loading device designed in the form of a roller test stand (1) with driven rollers (2) for charging an electrical energy storage device in a motor vehicle (4), in particular in an electric or hybrid vehicle, so that the electrical energy storage device of a motor vehicle (4) parked on it and connected to the vehicle wheels (3) of an axle via the rollers (2) is charged via its alternator or an electric motor of the motor vehicle (4) designed as a generator, characterized by , a detection / control device (5) which, depending on the vehicle type of the motor vehicle (4), determines the alternator or electric motor used and ascertains an optimal recuperation range and thus an optimal speed range for the alternator or electric motor used, wherein the detection / control device (5) furthermore detects current state variables of the electrical energy storage device and controls or regulates a drive device for driving the rollers (2) in such a way that it drives the rollers (2) according to the optimal recuperation power of the alternator or electric motor and while adhering to current limit values ​​of the electrical energy storage device, a holding device for fixing the motor vehicle (4) during loading, which is designed in the form of folding wedges that stand up and form a wedge shape when the motor vehicle (4) drives over them with its vehicle wheels (3) and thereby fixes the motor vehicle (4). [2] Charging device according to claim 1, characterized by , that the rollers (2) are profiled. [3] Charging device according to one of claims 1 or 2, characterized by that each loading device (1) has four rollers (2) provided, at least two of which are driveable. [4] Method for charging an electrical energy storage device in a motor vehicle (4), in particular in an electric or hybrid vehicle, with a charging device (1) according to one of the preceding claims, wherein the motor vehicle (4) is positioned on the loading device (1) in such a way that its vehicle wheels (3) of one axle are connected to the driven rollers (2) of the loading device (1) in a force-transmitting manner, Depending on the vehicle type of motor vehicle (4), conclusions can be drawn about the alternator or electric motor used, and an optimal recuperation range and thus an optimal speed range can be determined for the alternator or electric motor used. Furthermore, current state variables of the electrical energy storage are recorded, the rollers (2) are driven according to the optimal recuperation power of the alternator or electric motor and in compliance with current limit values ​​of the electrical energy storage, so that the energy storage of the motor vehicle (4) parked on it is charged via its alternator or an electric motor designed as a generator.

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