Conditioning of a motor vehicle

Abstract

A method (300) for heating a motor vehicle (105) with an electric drive machine (110) and a power converter (115) for controlling the drive machine (110), wherein the power converter (115) comprises a half-bridge (205) with an upper and a lower current valve (210, 215), comprises steps of controlling (320, 330, 335) the current valves (210, 215) such that an electric current flows through them without changing a torque converted by the electric drive machine (110).

Claims

[1] Method (300) for heating a motor vehicle (105) having an electric drive motor (110) and a power converter (115) for controlling the drive motor (110), wherein the power converter (115) comprises a half-bridge (205) with an upper (210) and a lower flow control valve (215); wherein the flow control valves (210, 215) are controlled (320, 330, 335) such that an electric current flows through them without changing a torque converted by the electric drive motor (110). [2] The method (300) of claim 1, wherein the torque converted by the electric drive machine (110) is zero. [3] Method (300) according to claim 1 or 2, wherein the upper and lower flow control valves (210, 215) are opened (320) simultaneously, but one of the flow control valves (210, 215) is only partially opened. [4] The method (300) of claim 3, wherein a control voltage of one of the flow control valves (210, 215) is below a breakdown voltage that must be exceeded to fully open the flow control valve. [5] Method (300) according to claim 4, wherein the control voltage is determined as a function of a temperature of the flow control valve. [6] Method (300) according to one of claims 3 to 5, wherein the upper and lower flow control valves (210, 215) are controlled (320) simultaneously to open, wherein the control is shorter than a control time during which the control must take place in order to fully open the flow control valve (210, 215). [7] Method (300) according to claim 6, wherein the control (320) is determined as a function of a temperature of the flow valve (210, 215). [8] Method (300) according to one of the preceding claims, wherein the power converter (115) comprises a plurality of half-bridges (205); wherein in a first phase (330) upper flow valves (210, 215) of the half-bridges (205) are closed and lower ones are opened; and in a second phase (335) upper flow valves (210, 215) of the half-bridges (205) are opened and lower ones are closed. [9] Method (300) according to one of the preceding claims, wherein the electric drive machine (110) is operated as a generator. [10] Control device (230) for a power converter (115) for operating an electric drive machine (110) for a motor vehicle (105); wherein the power converter (115) has a half-bridge (205) with an upper and a lower flow control valve (210, 215); wherein the control device (230) is configured to control the flow control valves (210, 215) such that an electric current flows through them without changing a torque converted by the electric machine. [11] A control system for a motor vehicle (105), the control system comprising a power converter (115) and a control device (230) according to claim 10; wherein the power converter (115) is cooled by means of fluid cooling. [12] Electric axle drive (100) comprising an electric drive machine (110), a power converter (115) and a control system according to claim 11. [13] Motor vehicle (105) comprising an electric axle drive (100) according to claim 12.

Images