Arrangement for controlling the power transmission of an all-wheel drive vehicle
First Claim
1. An arrangement for controlling a power transmission to axles of an all-wheel drive motor vehicle, having a main driving axle equipped with a transverse differential, and an auxiliary driving axle that is driven by a longitudinal clutch and is continuously controllable by control element means and a control unit, said control unit receiving input signals from a plurality of sensors relating to current operational variables of the vehicle and generating a control quantity for controlling said control element means of said longitudinal clutch as a function of at least one traction force of wheels of the vehicle, the improvement comprising:
- means for determining a desired traction force;
means for determining a driving resistance from a vehicle driving speed from at least one of said input signals from the plurality of sensors relating to current operational variables of the vehicle;
means for determining an excess traction force as a difference of an amount of said desired traction force and said driving resistance;
means for determining said traction force as a function of said desired traction force and a distribution factor; and
means for obtaining said distribution factor according to a first characteristic diagram stored in a memory area wherein said first characteristic diagram defines the distribution factor as a function of at least said excess traction force.
1 Assignment
0 Petitions
Accused Products
Abstract
In an arrangement for the control of the power transmission of a four-wheel drive vehicle, a main driving axle is driven directly and an auxiliary driving axle is driven via a continuously controllable longitudinal clutch by an internal combustion engine via a clutch-transmission unit. From a desired performance and the speed of the vehicle, a desired traction force of all the wheels is determined. From this desired traction force, and by a distribution factor that is dependent on operating driving parameters, the control quantity is obtained for the control of the longitudinal clutch. In addition, the longitudinal clutch can be controlled alone or in combination with the control quantity by an additional control quantity obtained by squaring of a speed difference at the longitudinal clutch.
-
Citations
16 Claims
-
1. An arrangement for controlling a power transmission to axles of an all-wheel drive motor vehicle, having a main driving axle equipped with a transverse differential, and an auxiliary driving axle that is driven by a longitudinal clutch and is continuously controllable by control element means and a control unit, said control unit receiving input signals from a plurality of sensors relating to current operational variables of the vehicle and generating a control quantity for controlling said control element means of said longitudinal clutch as a function of at least one traction force of wheels of the vehicle, the improvement comprising:
-
means for determining a desired traction force; means for determining a driving resistance from a vehicle driving speed from at least one of said input signals from the plurality of sensors relating to current operational variables of the vehicle; means for determining an excess traction force as a difference of an amount of said desired traction force and said driving resistance; means for determining said traction force as a function of said desired traction force and a distribution factor; and means for obtaining said distribution factor according to a first characteristic diagram stored in a memory area wherein said first characteristic diagram defines the distribution factor as a function of at least said excess traction force. - View Dependent Claims (2, 3)
-
-
4. An arrangement for controlling a power transmission to axles of an all-wheel drive motor vehicle, having a main driving axle equipped with a transverse differential, and an auxiliary driving axle that is driven by a longitudinal clutch and is continuously controllable by control element means and a control unit, said control unit receiving input signals from a plurality of sensors relating to current operational variables of the vehicle and generating a control quantity for controlling said control element means of said longitudinal clutch as a function of at least one traction force of wheels of the vehicle, the improvement comprising:
-
means for determining a desired traction force; means for determining a time related change of a vehicle speed from at least one of sad input signals from said plurality of sensors; means for determining a driving resistance from a vehicle driving speed from at least one of said input signals from the plurality of sensors relating to current operational variables of the vehicle; means for determining an excess traction force as a difference of an amount of said desired traction force and said driving resistance; means for determining said traction force as a function of said desired traction force and a distribution factor; and means for determining said distribution factor according to a first characteristic diagram stored in a memory area wherein said first characteristic diagram defines said distribution factor as a function of at least said time-related vehicle change and said excess traction force. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
Specification