Hybrid motor vehicle

Abstract

A hybrid motor vehicle, having an internal combustion engine, an electric motor, an interior climate-control device, a catalytic converter assigned to the internal combustion engine with a catalytic heating device which is operable from a medium-voltage network at a first voltage, particularly 48 V, a high-voltage network to which the electric motor is connected, at a second voltage that is higher than the first voltage, a voltage converter for converting the second voltage into the first voltage, a heat exchange device for heating a temperature-control medium, which is circulating in a temperature-control circuit, of the interior climate-control device by waste heat from the internal combustion engine, and a control device for operating the catalytic heating device as a function of the operation of the internal combustion engine.

Claims

1. A hybrid motor vehicle, comprising: an internal combustion engine, an electric motor, an interior climate-control device, a catalytic converter assigned to the internal combustion engine with a catalytic heating device that can be operated from a medium-voltage network at a first voltage, in particular 48 V, a high-voltage network to which the electric motor is connected at a second voltage, which is higher than the first voltage, a voltage converter for converting the second voltage into the first voltage, a heat exchange device for heating a temperature-control medium, circulating in a temperature-control circuit, of the interior climate-control device by waste heat from the internal combustion engine, and a control device for operating the catalytic heating device as a function of the operation of the internal combustion engine, wherein a climate-control heating device of the interior climate-control device operating at the first voltage is connected to the medium-voltage network, wherein the control device for operating the climate-control heating device is formed from the medium-voltage network, at least when the internal combustion engine is not in operation and/or the catalytic heating device is not in operation.

2. The hybrid motor vehicle according to claim 1, wherein the hybrid motor vehicle also has an electrical system at a third voltage that is lower than the first and the second voltage, in particular 12 V.

3. The hybrid motor vehicle according to claim 2, wherein the climate-control heating device is designed to heat air to be introduced into an interior space to be heated.

4. The hybrid motor vehicle according to claim 2, wherein the climate-control heating device is a resistance heater, in particular a PTC heater (PTC-Positive Temperature Coefficient).

5. The hybrid motor vehicle according to claim 2, wherein the control device is formed from the medium-voltage network in at least two first operating modes for the exclusive operation of the catalytic heating device or the climate-control heating device and/or in at least one second operating mode for the simultaneous operation of the catalytic heating device and the climate-control heating device.

6. The hybrid motor vehicle according to claim 2, wherein the control device has at least one switching device for switching the power supplies to the catalytic heating device and the climate-control heating device.

7. The hybrid motor vehicle according to claim 1, wherein the climate-control heating device is designed to heat air to be introduced into an interior space to be heated.

8. The hybrid motor vehicle according to claim 7, wherein the interior climate-control device also has a further heat exchange device for transferring heat from the temperature-control medium heated by the waste heat from the combustion engine to the air for heating the interior space.

9. The hybrid motor vehicle according to claim 8, wherein the climate-control heating device is a resistance heater, in particular a PTC heater (PTC-Positive Temperature Coefficient).

10. The hybrid motor vehicle according to claim 8, wherein the control device is formed from the medium-voltage network in at least two first operating modes for the exclusive operation of the catalytic heating device or the climate-control heating device and/or in at least one second operating mode for the simultaneous operation of the catalytic heating device and the climate-control heating device.

11. The hybrid motor vehicle according to claim 8, wherein the control device has at least one switching device for switching the power supplies to the catalytic heating device and the climate-control heating device.

12. The hybrid motor vehicle according to claim 7, wherein the climate-control heating device is a resistance heater, in particular a PTC heater (PTC-Positive Temperature Coefficient).

13. The hybrid motor vehicle according to claim 7, wherein the control device is formed from the medium-voltage network in at least two first operating modes for the exclusive operation of the catalytic heating device or the climate-control heating device and/or in at least one second operating mode for the simultaneous operation of the catalytic heating device and the climate-control heating device.

14. The hybrid motor vehicle according to claim 7, wherein the control device has at least one switching device for switching the power supplies to the catalytic heating device and the climate-control heating device.

15. The hybrid motor vehicle according to claim 1, wherein the climate-control heating device is a resistance heater, in particular a PTC heater (PTC-Positive Temperature Coefficient).

16. The hybrid motor vehicle according to claim 15, wherein the control device is formed from the medium-voltage network in at least two first operating modes for the exclusive operation of the catalytic heating device or the climate-control heating device and/or in at least one second operating mode for the simultaneous operation of the catalytic heating device and the climate-control heating device.

17. The hybrid motor vehicle according to claim 1, wherein the control device is formed from the medium-voltage network in at least two first operating modes for the exclusive operation of the catalytic heating device or the climate-control heating device and/or in at least one second operating mode for the simultaneous operation of the catalytic heating device and the climate-control heating device.

18. The hybrid motor vehicle according to claim 17, wherein the control device is formed with reduced heating power in order to maintain a minimum temperature of the already heated catalytic converter in the second operating mode for operating the catalytic heating device.

19. The hybrid motor vehicle according to claim 1, wherein the control device has at least one switching device for switching the power supplies to the catalytic heating device and the climate-control heating device.

20. The hybrid motor vehicle according to claim 1, wherein the hybrid motor vehicle is designed as a plug-in hybrid motor vehicle.

Description

BRIEF DESCRIPTION OF THE FIGURES

(1) Further advantages and details of the present invention will be apparent from the exemplary embodiments described below and in reference to the drawings. The following is shown:

(2) FIG. 1 a hybrid motor vehicle according to the invention in a first operating state; and

(3) FIG. 2 the hybrid vehicle according to the invention in a second operating state.

DETAILED DESCRIPTION

(4) FIG. 1 shows a schematic diagram of a hybrid motor vehicle 1 according to the invention. It has both an electric motor 2 and an internal combustion engine 3 in the drive train. The electric motor 2 is connected to a high-voltage network 4, which is at a second voltage (high voltage). A high-voltage battery 5 is also connected to the high-voltage network 4 and can be charged via a charger (not shown in detail), such that the hybrid motor vehicle 1 is a plug-in hybrid motor vehicle.

(5) A catalytic converter 6 is assigned to the internal combustion engine 3 and has a catalytic heating device 7 designed here as a heating disk. The catalytic heating device 7 is to be operated at a first voltage (medium voltage), which is obtained from the second voltage of the high-voltage network 4 by means of a voltage converter 8, such that the voltage converter 8 therefore provides the first voltage for a medium-voltage network 9. The hybrid motor vehicle 1 also has an electrical system (low-voltage network), not shown in greater detail for the sake of clarity, the third voltage of which is lower than the first voltage and the second voltage. In one example, the first voltage may be 48 V, the second voltage 450 V, and the third voltage 12 V.

(6) The internal combustion engine 3 is also coupled to a temperature-control circuit 11 via a heat exchange device 10, so that waste heat from the internal combustion engine 3 can be used during its operation to heat a temperature-control medium, which is cooling water in this case. By means of a further heat exchanger device 13, this heat can be used in an interior climate-control device 12 for heating air to be supplied to an interior of the motor vehicle 1. This interior climate-control device 12 accordingly comprises an air source 14 for outside air and/or circulated interior air as well as a distributor device 15 for distributing the heated air in the interior of the hybrid motor vehicle 1 in order to achieve its heating.

(7) In the present case, however, the interior climate-control device 12 also comprises an electrical climate-control heating device 16, which can also be used for heating air to be supplied to the interior. The climate-control heating device 16 is designed as a PTC heater and is also operated at the first voltage generated by the voltage converter 8, which is 48 V here. Both the catalytic heating device 7 and the climate-control heating device 16 can be supplied with current and thus corresponding electrical power by the voltage converter 8 via switching devices 17, 18 of a control device 19, which may also comprise a control device 20, which is shown schematically here.

(8) In both operating states shown in FIGS. 1 and 2, the interior is then to be heated, which can be selected, for example, by an occupant of the hybrid motor vehicle 1 via a corresponding operating device. In the first operating state according to FIG. 1, the internal combustion engine 3 is not used and is cold. The electric motor 2 is used for driving. Accordingly, no heat is given off to the temperature-control circuit 11, which means that the further heat exchanger device 13 cannot be used to heat air from the air source 14 to be supplied to the interior of the motor vehicle 1. On the other hand, no exhaust gases are produced either, which means that the catalytic converter 6 does not have to be heated and consequently the catalytic heating device 7 does not have to be operated. As shown on the basis of the switching devices 17 and 18, the control device 19 is designed to energize the climate-control heating device 16 exclusively in this operating state, so that, despite the absence of waste heat from the internal combustion engine 3, air according to arrow 21 can be heated by the climate-control heating device 16, see arrow 22, and can be output, via the air distribution device 15, to the interior of the motor vehicle 1, see arrow 23. This does not require a high-voltage heating device for the cooling water of the temperature-control circuit 11, as is the case with conventional hybrid motor vehicles.

(9) FIG. 2 shows a second operating state in which the internal combustion engine 3 is operated and therefore waste heat is introduced into the temperature-control circuit 11 according to arrow 24. Thus, in this case, see arrows 25 and 26, air to be introduced into the interior can be heated by means of the further heat exchanger device 13, while the climate-control heating device 16, see the position of the switching device 17, is not operated. Instead, the catalytic heating device 7, see position of the switching device 18, is supplied with electrical power for heating the catalytic converter 6 from the voltage converter 8 by means of the control device 19.

(10) In addition to the operating modes shown in FIGS. 1 and 2, in which either the climate-control heating device 16 or the catalytic converter heating device 7 is operated exclusively, mixed states are also conceivable, for example an operation of the catalytic converter heating device 7 with reduced power in order to maintain a certain minimum temperature while at the same time air is heated for the interior by the climate-control heating device 16. Other such second operating modes can of course also be implemented accordingly by the control device 19.