Method for operating a drive unit

• US 20060009899A1
• Filed: 06/29/2005
• Published: 01/12/2006
• Est. Priority Date: 06/29/2004
• Status: Active Grant

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Streib, Martin
• Granted Patent: US 7,698,041 B2
• Time in Patent Office: Days
• US Class Current: 701/51
• CPC Class Codes: F02D 2200/1006 Engine torque losses, e.g. friction or pumping losses or losses caused by external loads of accessories
• CPC Class Codes: F02D 2250/21 during a transition between engine operation modes or states
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position
• CPC Class Codes: F02D 41/023 in relation with the gear ratio shifting conjoint control for improving gear change B60W30/19
• CPC Class Codes: F02D 41/12 for deceleration F02D41/0005, F02D41/107 take precedence
• CPC Class Codes: Y10T 74/1254 by motor torque
• CPC Class Codes: Y10T 74/19251 Control mechanism
• CPC Class Codes: Y10T 74/19274 torque responsive

Abstract

A drive unit includes an engine and a transmission having a variable transmission ratio. An instantaneous setpoint power output quantity of the drive unit is determined from an intended power output. The setpoint power output quantity is a function of the instantaneous transmission ratio of the transmission at least for a given intended power output.

Claims

1. A method for operating a drive unit that includes an engine and a transmission having a variable transmission ratio, comprising:

determining an instantaneous setpoint power output quantity of the drive unit from an intended power output, wherein the setpoint power output quantity is a function of an instantaneous transmission ratio of the transmission, at least for a given intended power output.

2. The method as recited in claim 1, wherein a dependence on the instantaneous transmission ratio decreases continuously with increasing intended power output.

3. The method as recited in claim 2, wherein the dependence decreases one of linearly and exponentially.

4. The method as recited in claim 1, further comprising:

limiting, at least intermittently, a rate at which the instantaneous setpoint power output quantity changes at least one of during and after a change limitation corresponding to a change in the instantaneous transmission ratio from a value corresponding to an earlier transmission ratio toward a target setpoint power output quantity corresponding to the later transmission ratio.

5. The method as recited in claim 4, wherein the change limitation is effected by a filter having a low-pass characteristic.

6. The method as recited in claim 4, wherein:

if the instantaneous setpoint power output quantity corresponding to the earlier transmission ratio is less than a minimum possible power output quantity corresponding to the later transmission ratio, then, with the change in the transmission ratio, the instantaneous setpoint power output quantity is initially increased, without change limitation, to an intermediate value at least approximately equal to the minimum possible power output quantity corresponding to the later transmission ratio, and then the instantaneous setpoint power output quantity is increased from the intermediate value toward the later target setpoint power output quantity, using change limitation.

7. The method as recited claim 4, wherein the change limitation of the instantaneous setpoint power output quantity is set in such a way that the instantaneous setpoint power output quantity changes like the intended power output when the intended power output changes, whereas the instantaneous setpoint power output quanitity is subjected to the change limitation when the instantaneous transmission ratio changes.

8. The method as recited in claim 6, wherein the rate of change of the instantaneous setpoint power output quantity is at least approximately equal to a rate of change of the intended power output.

9. The method as recited in claim 4, wherein:

the instantaneous setpoint power output quantity is formed at least from a first component and a second component, the intended power output being taken into account to a higher degree in the first component than in the second component, the minimum possible power output quantity being taken into account to a higher degree in the second component than in the first component, and the change limitation of the first component being less than that of the second component.

10. The method as recited in claim 4, wherein:

if at least one of the intended power output is at least approximately equal to a minimum and there is one of an explicit reduction and a deactivation request, expressed by an operation of a brake, the change limitation is reduced and deactivated.

11. The method as recited in claim 4, wherein:

the change limitation is one of reduced and deactivated outside a limited time range after a change in the instantaneous transmission ratio.

12. A computer program that when executed results in a performance of:

determining an instantaneous setpoint power output quantity of a drive unit from an intended power output, wherein the setpoint power output quantity is a function of an instantaneous transmission ratio of a transmission, at least for a given intended power output.

13. An electric memory medium for a control and/or regulating device of an internal combustion engine, comprising:

a computer program that when executed results in a performance of;

determining an instantaneous setpoint power output quantity of a drive unit from an intended power output, wherein the setpoint power output quantity is a function of an instantaneous transmission ratio of a transmission, at least for a given intended power output.

14. A control and/or regulating device for an internal combustion engine, comprising:

a computer program that when executed results in a performance of;

determining an instantaneous setpoint power output quantity of a drive unit from an intended power output, wherein the setpoint power output quantity is a function of an instantaneous transmission ratio of a transmission, at least for a given intended power output.

15. An internal combustion engine for a motor vehicle, comprising:

a control and/or regulating device programmed according to a computer program that when executed results in a performance of;

determining an instantaneous setpoint power output quantity of a drive unit from an intended power output, wherein the setpoint power output quantity is a function of an instantaneous transmission ratio of a transmission, at least for a given intended power output.