DE10331754A1 - Method and device for adjusting the force acting on an accelerator pedal of an accelerator pedal device of a motor vehicle restoring force - Google Patents

Abstract

The invention relates to a method and a device for adjusting the restoring force acting on an accelerator pedal (2) of an accelerator pedal device (1) of a motor vehicle. DOLLAR A The invention provides that the adjustment takes place depending on the current fuel consumption (K) of the motor vehicle, wherein the current fuel consumption (K) from the product of the driving resistance force (F¶W¶) or the driving force (F¶AN¶) and the current vehicle speed (v¶Fzg¶) is determined.

Description

The The invention relates to a method and a device for adjustment to an accelerator pedal of an accelerator pedal device of a motor vehicle acting restoring force according to the preambles the claims 1 and 9.

Such a method and such a device describes the previously unpublished DE 102 51 035.0 , There, an adjusting device is presented, which adjusts the force acting on the accelerator pedal restoring force depending on the operating conditions of the vehicle.

Advantages of invention

By doing the inventive method a Adjustment of the restoring force acting on the accelerator pedal depending on Provides instantaneous fuel consumption of the motor vehicle, the driver receives a feeling with the foot on the Current fuel consumption, as a modified restoring force on the accelerator pedal a appropriate adjustment of the operating force conditionally. The feedback takes place at the foot of the Driver and thus to the organ, with which he the operating conditions of the vehicle certainly. Consequently, one is tangible and direct relationship between the one causing a certain fuel consumption Speed and acceleration request on the one hand and the reaction to it as changed Restoring force the accelerator pedal on the other hand given what an advantageous way short reaction time of the driver to a changed fuel consumption to expect.

Preferably is the force acting on the accelerator pedal restoring force with increasing Fuel consumption increased. The then required increased operating force on the accelerator pedal is perceived by the driver as a signal that Speed and thus to throttle the fuel consumption, to Others, they are an obstacle to the speed further increase.

The instantaneous fuel consumption K is determined from the product of the driving resistance force F _W or the driving force F _AN and the instantaneous vehicle _speed v _Fzg . K = F W · v veh respectively. K = FAN · v veh

In this case, the variables driving resistance force F _W and driving force F _{AN can} alternatively be used as the basis for calculation, since the following equilibrium relationship applies during operation of a motor vehicle between these variables F AT (Driving force) = F W (Running resistance force)

Opposite known in the prior art method in which the fuel consumption over the injected fuel quantity is determined, there is the advantage a measurement without significant time delay. Consequently, the inventive method allows a substantially dead time free and fast response to a Speed and acceleration request in the form of a modified Restoring force on the accelerator pedal, which is beneficial to the driving behavior and thus affects fuel economy.

The Determining the fuel consumption for generating a manipulated variable for an actuating device, which the restoring force the accelerator pedal adjusts or adjusts takes place in a calculation unit, which For example, in an engine control unit of an internal combustion engine of the motor vehicle is integrated.

By in the subclaims listed activities are advantageous developments and improvements in the claim 1 indicated invention possible.

Particularly preferably, the driving resistance force F _{W is determined} from a sum of driving resistances, which includes the air resistance F _L , the rolling resistance F _RO and the gradient resistance F _ST .

Then, the instantaneous fuel consumption K is preferably determined according to the following equation K = F W · v veh ie K = (F RO + F L + F ST ) · V veh in which
F _{RO is} the rolling resistance of the vehicle,
F _{L is} the air resistance of the vehicle,
F _{ST is} the pitch resistance of the vehicle,
v _Fzg The current vehicle _speed is.

The instantaneous vehicle _speed v _Fzg represents a variable which is constantly retrievable from the engine control unit. The air resistance F _L can be determined from the following equation: F L = C · v veh in which
C is the product of the drag coefficient, the vehicle frontal area and the half air density.

The sum of the rolling resistance of the vehicle F _RO and the gradient resistance of the vehicle F _ST can be obtained from the equilibrium relationship between the driving force F _AN and the driving resistance force F _W (road resistance equation) F RO + F ST = a · m veh - F AT - F L in which
a the instantaneous vehicle acceleration,
m _fzg the vehicle mass,
F _AN the driving force of the vehicle,
F _{RO is} the rolling resistance of the vehicle,
F _L air resistance,
F _{ST is} the pitch resistance of the vehicle.

The instantaneous vehicle acceleration a is measured directly by means of an acceleration _sensor or preferably calculated from differentiation of the vehicle _speed v _Fzg .

drawings

One embodiment The invention is illustrated in the drawing and in the following description explained in more detail. In the drawing shows

1 a schematic representation of an accelerator pedal module with adjustable restoring force;

2 a flowchart showing the method steps of the method for adjusting the force acting on an accelerator pedal of an accelerator pedal device of a motor restoring force depending on the current fuel consumption according to a preferred embodiment.

description of the embodiment

This in 1 shown active accelerator pedal module 1 A motor vehicle includes a driver-actuated accelerator pedal 2 which is loaded by a restoring setpoint force F _pedsoll acting against the actuation force. The accelerator pedal module 1 has an adjusting device, not shown for reasons of scale, for setting the return setpoint force F _pedsoll on the accelerator pedal 2 , Such a control device is in the DE 102 51 035.0 described in detail, the relevant disclosure of which is expressly incorporated herein by reference.

Preferably, the restoring setpoint force F _{pedsoll is predetermined} by an electrical signal of an engine control unit of an internal combustion engine of the motor vehicle. In addition, the angular position w _{ped of} the accelerator pedal 2 detected electronically. Furthermore, a preferably integrated in the engine control unit control device is present, which on the accelerator pedal 2 acting reset actual force F _pedist constantly restoring nominal force F adjusts _pedsoll.

The reference value formation of the reset target force F _pedsoll is dependent on the current fuel consumption K of the motor vehicle. According to the invention, the instantaneous fuel consumption K is determined from the product of the driving resistance force F _W or the driving force F _AN and the instantaneous vehicle _speed v _Fzg . K = F W · v veh (1) respectively. K = F AT · v veh (2)

In this case, the variables driving resistance force F _W and driving force F _{AN can} alternatively be used as the basis for calculation, since the following equilibrium relationship applies during operation of a motor vehicle between these variables F AT (Driving force) = F W (Driving Resistance Force) (3)

The determination of the fuel consumption K for generating a manipulated variable for the adjusting device takes place in a calculation unit 4 , which is integrated, for example, in the engine control unit of the motor vehicle ( 2 ).

Preferably, the driving resistance force F _{W is} used as the basis for calculation, which is determined from a sum of driving resistances, which includes, for example, the air resistance F _L , the rolling resistance F _RO and the gradient resistance F _ST . In addition, further driving resistances can be included in the driving resistance force F _W , such as the wind resistance, which is neglected in the present case.

Then, the instantaneous fuel consumption K is preferably determined according to the following equation K = F W · v veh (4) ie K = (F RO + F L + F ST ) · V veh in which
F _{RO is} the rolling resistance of the vehicle,
F _{L is} the air resistance of the vehicle,
F _{ST is} the pitch resistance of the vehicle,
v _Fzg The current vehicle _speed is.

The instantaneous vehicle _speed v _Fzg represents a variable which is constantly retrievable from the engine control unit. The air resistance F _L can be determined from the following equation: F L = C · v veh (5) in which
C is the product of the drag coefficient, the vehicle frontal area and the half air density.

The sum of the rolling resistance of the vehicle F _RO and the gradient resistance of the vehicle F _ST can be obtained from the equilibrium relationship between the driving force F _AN and the driving resistance force F _W (road resistance equation) F RO + F ST = a · m veh - F AT - C · v veh 2 (6) in which
a the instantaneous vehicle acceleration,
m _fzg the vehicle mass,
F _AN the driving force of the vehicle,
F _{RO is} the rolling resistance of the vehicle,
C · v _Fzg ² = F _L the air resistance,
F _{ST is} the pitch resistance of the vehicle.

The instantaneous vehicle acceleration a is measured directly by means of an acceleration _sensor or preferably calculated by means of differentiation of the vehicle _speed v _Fzg . The drive force F _{AN of} the vehicle is calculated, for example, from the drive torque and the current transmission ratio. Ultimately, therefore, the sum of the rolling resistance of the vehicle F _RO and the pitch resistance of the vehicle F _ST can be derived from the current vehicle _speed v _Fzg and from the driving force F _AN according to equation (6). Since in the calculation of the vehicle _acceleration a, the vehicle _speed v _{Fzg is} differentiated, the result must be filtered, including a filter device 6 is provided.

Output variables of the calculation unit 4 Consequently, the driving resistance force F _W and the vehicle _speed v are _Fzg . In the calculation unit are driving resistance maps 10 stored, which set these quantities in relation to a current fuel consumption K according to equation (4) and the latter in relation to a specific restoring force F _ped on the accelerator pedal. A coordinator unit 8th , in which further requirements for the restoring force F _ped such as in a short-term increase in a kick-down function received, finally generates the electrical signal for the return set force F _pedsoll , which in the accelerator pedal _module 1 is controlled.

Claims (9)

Method for adjusting the accelerator pedal ( 2 ) an accelerator pedal device ( 1 ) of a motor vehicle acting restoring force, characterized in that the setting is dependent on the current fuel consumption (K) of the motor vehicle, wherein the instantaneous fuel consumption (K) from the product of the driving resistance force (F _W ) or the driving force (F _AN ) and the current Vehicle _speed (v _Fzg ) is determined. A method according to claim 1, characterized in that the driving resistance force (F _W ) is determined from a sum of driving resistances, which includes the air resistance (F _L ), the rolling resistance (F _RO ) and the pitch resistance (F _ST ). A method according to claim 2, characterized in that the instantaneous fuel consumption (K) is determined according to the following equation K = (F RO + F L + F ST ) · V veh where K is the fuel consumption F _{RO of} the rolling resistance of the vehicle, F _{L is} the air resistance of the vehicle, F _{ST is} the gradient resistance of the vehicle, V _{Fzg is} the instantaneous vehicle _speed . A method according to claim 2 or 3, characterized in that the air resistance (F _L ) is determined from the following equation F L = C · v veh where F _{L is} the air resistance, C is the product of the drag coefficient, the vehicle end _face and the half air density, V _Fzg the current vehicle _speed . Method according to one of claims 2 to 4, characterized in that the sum of the rolling resistance of the vehicle (F _RO ) and the pitch resistance of the vehicle (F _ST ) from an equilibrium relationship between the driving force (F _AN ) and at least some of the driving resistances is determined (driving resistance equation) F RO + F ST = a · m veh - F AT - F L where a is the instantaneous vehicle _acceleration , m _fzg the vehicle mass, F _AN the driving force of the vehicle, F _{RO is} the rolling resistance of the vehicle, F _{L is} the air resistance, F _{ST is} the gradient resistance of the vehicle. A method according to claim 5, characterized in that the instantaneous vehicle acceleration (a) by means of an acceleration _sensor directly measured or calculated from differentiation of the vehicle _speed (V _Fzg ). Method according to at least one of the preceding claims, characterized in that the instantaneous vehicle _speed (v _Fzg ) and the instantaneous driving force (F _AN ) are determined directly or indirectly from variables which are processed in an engine control unit. Method according to at least one of the preceding Claims, characterized in that the force acting on the accelerator pedal restoring force with increasing fuel consumption is increased. Device for adjusting the accelerator pedal ( 2 ) an accelerator pedal device ( 1 ) of a motor vehicle acting restoring force, characterized in that it is designed such that the adjustment of the restoring force is dependent on the current fuel consumption (K) of the motor vehicle, and that a calculation unit ( 4 ) is provided for determining the current fuel consumption (K) from the product of the driving resistance force (F _W ) or the driving force (F _AN ) and the current vehicle _speed (V _Fzg ).