Coupled axle drive system for a vehicle
First Claim
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1. A coupled axle drive system for a vehicle, comprising:
- a first axle drive device for driving a first axle of the vehicle by a connected engine;
a second axle drive device for driving a second axle of the vehicle, the second axle drive device having at least one electric machine for driving wheels of the second axleat least one energy storage device connected to the electric machine;
a control device connected to the second axle drive device and to an engine control device or being part of the engine control device, the controller including a route simulator for determining which sections of a specified route should be driven by both the first and second drive devices to achieve quickest traversal of the route and applying power by the second axle drive device based on the determined charge state of the energy store to achieve uniform handling of the vehicle in each of the sections of the route in which the second drive device is actuated.
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Abstract
A coupled axle drive system for a vehicle has a first axle drive device for driving a first axle of the vehicle by a connected engine and a second axle drive device for driving a second axle of the vehicle. The second axle drive device has an electric machine for driving at least one wheel of the axle.
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Citations
15 Claims
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1. A coupled axle drive system for a vehicle, comprising:
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a first axle drive device for driving a first axle of the vehicle by a connected engine; a second axle drive device for driving a second axle of the vehicle, the second axle drive device having at least one electric machine for driving wheels of the second axle at least one energy storage device connected to the electric machine; a control device connected to the second axle drive device and to an engine control device or being part of the engine control device, the controller including a route simulator for determining which sections of a specified route should be driven by both the first and second drive devices to achieve quickest traversal of the route and applying power by the second axle drive device based on the determined charge state of the energy store to achieve uniform handling of the vehicle in each of the sections of the route in which the second drive device is actuated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a coupled axle drive system having a first axle drive device for driving a first axle of a vehicle by an engine and a second axle drive device for driving a second axle of the vehicle, the second axle drive device having at least one electric machine for driving wheels of the second axle and an energy store connected to the electric machine, the method being performed by a control device and comprising:
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determining a route for the vehicle; simulating the vehicle being driven on the route by two-wheel drive and separately by four-wheel drive; comparing the simulation for two-wheel drive and four-wheel drive; determining, based on the simulation, which sections of the route should be driven by four wheel drive to achieve a quickest traversal of the route; determining a charge condition of the energy store; and actuating the second axle drive device to achieve four wheel drive in the route sections that were determined in the simulation to achieve the quickest traversal of the route with the four-wheel drive, and the second axle drive device being actuated based on the determined charge state of the energy store to achieve uniform handling of the vehicle in each of the sections of the route in which the second drive device is actuated. - View Dependent Claims (11, 12, 13, 14)
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15. A method for controlling a coupled axle drive system having a first axle drive device for driving a first axle of a vehicle by an engine and a second axle drive device for driving a second axle of the vehicle, the second axle drive device having at least one electric machine for driving at least one wheel of the second axle and an energy store connected to the electric machine, the method comprising:
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traveling a route with the vehicle while using the first drive device; determining, by a control device and on the basis of the route, whether there is a suitable route section suitable for four-wheel drive by simulating the vehicle being driven on the route by two-wheel drive and then by four-wheel drive; comparing by the control device the simulation for two-wheel drive and four-wheel drive; determining by the control device a route section suitable for four-wheel drive as the route section through which the vehicle travels more quickly in the simulation with four-wheel drive than with two-wheel drive; and actuating the second axle drive device if there is at least one such route section.
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Specification