Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D5/00—Power-assisted or power-driven steering
  • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
  • B62D5/062—Details, component parts
  • B62D5/064—Pump driven independently from vehicle engine, e.g. electric driven pump
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D5/00—Power-assisted or power-driven steering
  • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
  • B62D5/065—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle characterised by specially adapted means for varying pressurised fluid supply based on need, e.g. on-demand, variable assist
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
  • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
  • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
  • F04B53/08—Cooling; Heating; Preventing freezing
• • H—ELECTRICITY
  • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
  • H02K—DYNAMO-ELECTRIC MACHINES
  • H02K5/00—Casings; Enclosures; Supports
  • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
  • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
  • H02K5/203—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium specially adapted for liquids, e.g. cooling jackets
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D5/00—Power-assisted or power-driven steering
  • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
  • B62D—MOTOR VEHICLES; TRAILERS
  • B62D5/00—Power-assisted or power-driven steering
  • B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
  • B62D5/062—Details, component parts

Definitions

• the present approach relates to a control device for a vehicle with a steering device, a steering device and a method for cooling an electric motor for a steering device.
• a recirculating ball steering gear can be operated by an external, unidirectional hydraulic pump, for example.
• a connection between the pump and the steering gear can be made, for example, by external piping.
• An external oil reservoir may also be required as an expansion tank.
• the object of the present approach is to create an improved control device for a vehicle with a steering device, an improved steering device and an improved method for cooling an electric motor.
• control unit having the features of device claim 1, by a steering device according to claim 3, by a method according to claim 12 and by a computer program according to claim 13.
• a control device for a vehicle with a steering device which includes a pump device, a transmission device and the control device.
• the pumping device has a pump for pumping a working medium to a first output connection or a second output connection of the pumping device and an electric motor for driving the pump, the electric motor being at least partially surrounded by the working medium and additionally or alternatively being flushed or capable of being flushed.
• the transmission device has an input shaft that can be coupled to a steering wheel and an output shaft that can be coupled to a steering column arm, a transmission element that can be moved in a first direction and a second direction to transmit torque from the input shaft to the output shaft, and a first working medium connection and a second working medium connection, wherein the first working fluid port is connected to the first output port for moving the gear using the working fluid in the first direction; and the second working fluid port is connected to the second output port for moving the gear using the working fluid in the second direction.
• the control device is designed to provide a motor signal to the electric motor for operating the electric motor in a normal operating phase of the steering device for cooling the electric motor.
• the vehicle can be implemented, for example, as a commercial vehicle, for example as a truck, which is designed primarily to transport objects. Since such a vehicle can have a weight of several tons, the steering device that supports a steering movement of a driver of the vehicle is advantageous.
• the pumping device can be designed, for example, to move the working medium through the steering device.
• the working medium can be implemented as hydraulic oil, for example, which can be designed, for example, to carry away heat generated during operation of the electric motor.
• the first output port and the second output port can be designed, for example, to output the working medium to a line system of the steering device.
• the line system can be implemented, for example, in the form of hoses or pipes.
• the transmission element can be designed to To transfer the driver's steering movement to a wheel axle of the vehicle, so that the wheels turn in the desired direction and so, for example, a direction of travel can be changed.
• the control device can be part of the steering device, which provides corresponding signals, such as the motor signal, to the electric motor of the pump device in the normal operating phase. In this way, the electric motor can advantageously be cooled in such a way that, for example, damage caused by overheating can be avoided.
• the normal operating phase can be, for example, an operating state in which the vehicle is in a driving process, but also in which a vehicle engine of the vehicle is running.
• the control device can be designed to provide the motor signal as a signal that can cause a current flow through at least one motor winding of the electric motor, resulting in a rotation of a rotor of the electric motor.
• the motor winding can also be referred to as a coil, for example, through which current can flow.
• the rotor can advantageously be realized as a rotatable rotor disc which can rotate by means of a magnetic field. In this case, the magnetic field can arise, for example, as a result of the current flow flowing through the motor winding.
• the current flow through the motor winding should therefore be strong enough to actually cause the rotor to rotate and not just heat up the lines of the rotor, which can be used, for example, to heat the working medium in an initial stage of operation of the steering device.
• a steering device for a vehicle which has a pumping device with a pump for pumping a working medium to a first output port or a second output port of the pumping device and an electric motor for driving the pump, the electric motor being at least partially surrounded by the working medium and additionally or alternatively washed around.
• the steering device has a transmission device, which has an input shaft that can be coupled to a steering wheel and an output shaft that can be coupled to a steering column arm, a transmission element that can be moved in a first direction and a second direction to transmit torque from the input shaft to the output shaft, and a first working medium connection and a having second working medium connection.
• the first working medium port is connected to the first output port for moving the transmission element using the working medium in the first direction and the second working medium port is connected to the second output port for moving the transmission element using the working medium in the second direction.
• the steering device has a control device in one of the aforementioned variants.
• the steering device can be implemented in a vehicle, for example, as mentioned above.
• the steering device can, for example, have the control unit in one of the variants presented above.
• installation space within the vehicle can be used efficiently.
• the electric motor can have a motor winding that can be surrounded by the working medium.
• the working medium can flow around the motor winding in order to advantageously carry away heat given off by the motor winding and thereby cool the motor winding.
• Direct contact of the working medium with lines of the motor winding or a housing of the motor winding of the electric motor is particularly favorable in order to be able to quickly and efficiently dissipate the heat generated during operation of the electric motor from the motor winding.
• the pump and the electric motor can have a common shaft and be arranged in a common housing.
• installation space can advantageously be saved, so that, for example, the pumping device can be realized in a smaller size.
• the housing may include a channel for directing the working fluid from an inlet along an interior wall of the housing to the motor winding, where the channel may be shaped to direct the working fluid around the motor winding.
• the working medium can emit the heat to be removed due to the arrangement of the channel on the inner wall of the housing and can thus cool down again, at least to some extent.
• a rotor of the electric motor can have a plurality of permanent magnets, it being possible for adjacent permanent magnets to be spaced apart by slots for the passage of the working medium.
• the working medium can flow through the slots into the channel in this way.
• the slots can be shaped to convey the working medium as the rotor rotates.
• a cooling process can start as soon as the rotor rotates, ie as soon as current flows through the motor winding, a magnetic field builds up and the permanent magnets are repelled by the magnetic field.
• the pump may be formed as a bi-directional hydraulic pump.
• the pump can advantageously pump the working medium in the first direction or the second direction, depending on the steering movement.
• the steering device may further include a valve connected between the first output port and the second output port.
• the valve can be formed, for example, in order to intervene in an emergency situation, for example, or to move the working medium during a warm-up phase, without the steering column lever being actuated as a result.
• the electric motor cannot move the pitman arm when the valve is open.
• a safety and maintenance function can be implemented by the valve.
• the method includes a step of providing a motor signal to the electric motor of the steering device to operate the electric motor.
• the method can be used in a commercial vehicle, for example.
• This method can be implemented, for example, in software or hardware or in a mixed form of software and hardware, for example in a control device in one of the aforementioned variants.
• the step of a variant of the method presented here can be carried out, controlled or implemented in corresponding devices.
• the task on which the approach is based can also be solved quickly and efficiently by this embodiment variant of the approach.
• control unit can have at least one computing unit for processing signals or data, at least one storage unit for storing signals or data, at least one interface to a sensor or an actuator for reading in sensor signals from the sensor or for outputting data or control signals to the Actor and additionally or alternatively have at least one communication interface for reading or outputting data that are embedded in a communication protocol.
• the arithmetic unit can be a signal processor, a microcontroller or the like, for example, while the storage unit can be a flash memory, an EPROM or a magnetic storage unit.
• the communication interface can be designed to read in or output data wirelessly and/or by wire, wherein a communication interface that can read in or output wire-bound data can, for example, read this data electrically or optically from a corresponding data transmission line or output it to a corresponding data transmission line.
• control device controls a method for cooling an electric motor for a steering device.
• control unit can, for example, access sensor signals such as an engine signal.
• the control takes place via actuators such as a supply unit, which is designed to provide the motor signal.
• FIG. 1 shows a schematic representation of a vehicle with a steering device and a control unit according to an exemplary embodiment
• FIG. 2 shows a schematic cross-sectional view of a pumping device according to an embodiment
• FIG. 3 shows a flowchart of a method for cooling an electric motor for a steering device according to an embodiment.
• the vehicle 100 can be implemented, for example, as a commercial vehicle that is designed to mainly transport objects. Since the vehicle 100 can weigh several tons, the vehicle 100 has the steering device 102 .
• the steering device 102 is designed to support a steering operation of an occupant of the vehicle 100 .
• the steering device 102 has a pump device 104 , a transmission device 106 and a control device 110 .
• the steering device 102 has a valve 108 only as an option.
• the pumping device 104 includes a pump 112 for pumping a working medium to a first output port 114 or a second output port 116 of the pumping device 104 and an electric motor 118 which is designed to drive the pump 112 .
• the pump 112 can be implemented as a bidirectional hydraulic pump, for example.
• the transmission device 106 has an input shaft 120 which can be coupled to a steering wheel and an input shaft 120 which can be coupled to a drop arm 122 Output shaft 124 on. Furthermore, the transmission device 106 has a transmission element 130 that is movable in a first direction 126 and a second direction 128 in order to transmit a torque from the input shaft 120 to the output shaft 124 .
• Transmission device 106 also includes a first working medium port 132 and a second working medium port 134, with first working medium port 132 being connected to first output port 114 for moving transmission element 130 using the working medium in first direction 126, and second working medium port 134 for moving transmission element 130 is connected to the second output port 116 using the working fluid in the second direction 128 .
• the steering device 102 also has the control unit 110 which is designed to provide a motor signal 140 to the electric motor 118 for operating the electric motor 118 in a normal operating phase of the steering device 102 for cooling the electric motor 118 .
• the steering device 102 has the valve 108 which, according to this exemplary embodiment, is connected between the first output port 114 and the second output port 116 .
• the valve 108 according to this exemplary embodiment has a first valve connection 136 and a second valve connection 138 .
• the first valve port 136 is arranged between the first output port 114 and the first working medium port 132 .
• the second valve connection 138 is arranged between the second output connection 116 and the second working medium connection 134 .
• control unit 110 is optionally designed to provide motor signal 140 for operating electric motor 118 to electric motor 118 in the normal operating phase for moving steering column arm 122 and to provide valve closing signal 144 for closing valve 108 to valve 108.
• control unit 110 is designed to provide a valve opening signal 142 to valve 108 in an emergency situation, for example, in order to open valve 108, thereby preventing a steering movement. This means that the valve 108 blocks a flow of the working medium in the normal operating phase, so that this according to this Exemplary embodiment is pumped through the transmission device 106 and transmits a steering direction 146 specified by the driver of the vehicle 100 via a steering rod 148 to the vehicle wheels 150 .
• input shaft 120 is designed, for example, to introduce a torque into steering device 102 from a steering column (not shown here) of vehicle 100, to which input shaft 120 can be or is connected.
• the torque introduced via the input shaft 120 can also be referred to as an input torque.
• input shaft 120 is connected or mechanically coupled via the steering column of the steering system to a steering wheel, not shown here, of vehicle 100 .
• the output shaft 124 according to this exemplary embodiment is designed to derive the torque from the steering device 102 or to output the torque to the steering column arm 122 .
• the torque dissipated via the output shaft 124 may also be referred to as an output torque or an output force.
• transmission element 130 is designed to mechanically transmit the torque from input shaft 120 to output shaft 124 and/or to convert the input torque into the output torque.
• control unit 110 is designed to provide motor signal 140 as a signal that causes a current to flow through a motor winding of electric motor 118 , resulting in a rotation of a rotor of electric motor 118 .
• control unit 110 is optionally designed to read in a temperature signal 152, for example, which indicates a temperature.
• the temperature signal 152 is provided to the control unit 110 by a temperature sensor 154, such as a thermometer.
• the temperature sensor 154 is implemented or can be implemented as part of the pump device 104 . Alternatively, the temperature sensor 154 can also be arranged elsewhere in the vehicle 100 .
• the pumping device 104 also has an input connection 156 via which the pumping device 104 according to this Embodiment is connected to a storage vessel 158 for storing the working medium.
• control unit 110 is also designed to activate the normal operating phase in response to a start signal 160, which indicates a cold start of vehicle 100, for example.
• a possibility is presented to cool the electric motor 118 by means of oil circulation.
• a vehicle for example a truck
• an electro-hydraulically operating steering gear which is referred to here as a transmission device 106
• the two ports of pumping device 104 which are referred to here as first output port 114 and second output port 116, are connected to transmission device 106, more precisely to at least one cylinder of a conventionally known steering gear.
• the electric motor 118 driving the pump 112 is surrounded by the working medium of the storage vessel 158, which is also referred to as a storage vessel or expansion vessel.
• the waste heat from the electric motor 118 is dissipated via the working medium, the electric motor 118 also being used for the oil circulation.
• FIG. 2 shows a schematic cross-sectional illustration of a pumping device 104 according to an exemplary embodiment.
• the pumping device 104 shown here can be similar to or correspond to the pumping device 104 described in FIG. 1 .
• the pump 112 is arranged centrally in the pumping device 104 and is firmly connected to the electric motor 118 .
• the pump 112 and the electric motor 118 are arranged in a housing 200 which encloses both the pump 112 and the electric motor 118, which have a common shaft.
• the housing 200 according to this embodiment has a plurality of ribs 201 on an outer wall, which are formed in order to enhance a cooling effect. They are thus formed to enhance an increase in surface area of the case 200 to transmit the heat to the outside.
• pump 112 On a side facing electric motor 118 , pump 112 is connected to a T-shaped coupling point of electric motor 118 in the manner of a cover.
• a rotor 202 of the electric motor 118 is arranged on an axis 203 aligned perpendicular to the pump 112 .
• the rotor 202 is in the form of a rotor disk, for example, which rotates around the pump 112 in the normal operating phase.
• the rotor 202 in turn has a plurality of permanent magnets, with adjacent permanent magnets being spaced apart by slots 204 for the passage of the working medium.
• the slots 204 are formed here in order to convey the working medium when the rotor 202 rotates.
• the housing 200 has a channel 206 for conducting the working medium from an inlet along an inner wall of the housing 200 to a motor winding 208 (not shown here) of the electric motor 118 .
• channel 206 is formed to direct the working fluid around motor winding 208 .
• a flow direction of the working medium is illustrated here by the arrows 210 shown.
• the pump 112 pumps the working medium from a pump outlet 212 through the channel 206 along a wall of the housing 200, where the working medium cools according to one embodiment, in the direction of the motor windings 208.
• the working medium flows around the motor winding 208 around and through the slots 204 in the direction of the housing wall up to the pump outlet 212, for example by a heat exchanger 214.
• a magnetic field is created in the normal operating phase.
• the majority of the permanent magnets are repelled by the magnetic field due to their polarity, so that the rotatable rotor 202 rotates.
• the working medium is circulated, which in turn transports away the heat generated by the electric motor 118 in the normal operating phase.
• the heat exchanger 214 is designed to enable an even higher heat removal through the working medium flowing past this heat exchanger 214 and thus to support the cooling process.
• the approach described here is presented.
• the passage 206 directs the heated working fluid along an entire inner wall of the cylindrically shaped housing 200 and cools.
• the working medium flows around the motor winding 208 and cools it.
• the slots 204 between the rotating permanent magnets on the rotor 202 serve as a drive for the oil circulation, so that they show the function of a circulation pump.
• FIG. 3 shows a flow chart of a method 300 for cooling an electric motor for a steering device according to an exemplary embodiment.
• the steering device can correspond to the steering device described in FIG. 1 and accordingly have a pump device as described in FIG.
• the method 300 is thus designed to control the pump device.
• Method 300 creates the possibility of using the working medium for cooling the electric motor.
• the method 300 comprises a step 302 of providing the motor signal to the electric motor of the steering device in order to operate the electric motor.
• an embodiment includes an "and/or" link between a first feature and a second feature, this should be read in such a way that the embodiment according to one embodiment includes both the first feature and the second feature and according to a further embodiment either only the first Feature or has only the second feature.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Transportation (AREA)
• Power Engineering (AREA)
• Motor Or Generator Cooling System (AREA)
• Steering Control In Accordance With Driving Conditions (AREA)
• Power Steering Mechanism (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=80122464

Family Applications (1)

Country Status (6)

Family Cites Families (10)

• 2021
  • 2021-02-18 DE DE102021103818.9A patent/DE102021103818A1/de active Pending
• 2022
  • 2022-01-24 JP JP2023549896A patent/JP2024506730A/ja active Pending
  • 2022-01-24 WO PCT/EP2022/051497 patent/WO2022175024A1/de active Application Filing
  • 2022-01-24 US US18/277,602 patent/US20240308577A1/en active Pending
  • 2022-01-24 CN CN202280015920.3A patent/CN116917190A/zh active Pending
  • 2022-01-24 EP EP22701388.5A patent/EP4294702A1/de active Pending

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