Method for operating a drive unit
First Claim
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1. A method for operating a drive unit that includes an engine and a transmission having a variable transmission ratio, comprising:
- determining an intended power output based on a gas pedal operation;
determining an instantaneous setpoint power output quantity of the drive unit from the intended power output, maximal possible output torque of an engine at nominal speed, and minimal possible output torque of an engine at an instantaneous speed, 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; and
for a change limitation, reducing, at least intermittently, a rate at which the instantaneous setpoint power output quantity approaches a target setpoint power output quantity corresponding to a later transmission ratio, the reducing occurring at least one of during and after a change limitation period corresponding to a change in the instantaneous transmission ratio from an earlier transmission ratio to the later transmission ratio;
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 reducing the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity, until the instantaneous setpoint power output quantity reaches an intermediate value at least approximately equal to the minimum possible power output quantity corresponding to the later transmission ratio, at which point reduction of the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity is activated;
the change limitation is activated in an event of a gear shift at a first predetermined time, the change limitation remaining active until a second predetermined time; and
subsequent to the second predetermined time, a time constant of the change limitation is brought to a value of 1, so that the instantaneous power output quantity approaches the target setpoint power output quantity at a third predetermined time.
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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.
31 Citations
12 Claims
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1. A method for operating a drive unit that includes an engine and a transmission having a variable transmission ratio, comprising:
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determining an intended power output based on a gas pedal operation; determining an instantaneous setpoint power output quantity of the drive unit from the intended power output, maximal possible output torque of an engine at nominal speed, and minimal possible output torque of an engine at an instantaneous speed, 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; and for a change limitation, reducing, at least intermittently, a rate at which the instantaneous setpoint power output quantity approaches a target setpoint power output quantity corresponding to a later transmission ratio, the reducing occurring at least one of during and after a change limitation period corresponding to a change in the instantaneous transmission ratio from an earlier transmission ratio to the later transmission ratio; 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 reducing the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity, until the instantaneous setpoint power output quantity reaches an intermediate value at least approximately equal to the minimum possible power output quantity corresponding to the later transmission ratio, at which point reduction of the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity is activated; the change limitation is activated in an event of a gear shift at a first predetermined time, the change limitation remaining active until a second predetermined time; and subsequent to the second predetermined time, a time constant of the change limitation is brought to a value of 1, so that the instantaneous power output quantity approaches the target setpoint power output quantity at a third predetermined time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A hardware computer-readable medium having stored thereon instructions executable by a computer processor, the instructions which, when executed, cause the processor to perform a method for a control and/or regulating device of an internal combustion engine, the method comprising:
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determining an intended power output based on a gas pedal operation; determining an instantaneous setpoint power output quantity of a drive unit from the intended power output, maximal possible output torque of an engine at nominal speed, and minimal possible output torque of an engine at an instantaneous speed, 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; and for a change limitation, reducing, at least intermittently, a rate at which the instantaneous setpoint power output quantity approaches a target setpoint power output quantity corresponding to a later transmission ratio, the reducing occurring at least one of during and after a change limitation period corresponding to a change in the instantaneous transmission ratio from an earlier transmission ratio to the later transmission ratio; 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 reducing the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity, until the instantaneous setpoint power output quantity reaches an intermediate value at least approximately equal to the minimum possible power output quantity corresponding to the later transmission ratio, at which point reduction of the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity is activated; the change limitation is activated in an event of a gear shift at a first predetermined time, the change limitation remaining active until a second predetermined time; and subsequent to the second predetermined time, a time constant of the change limitation is brought to a value of 1, so that the instantaneous power output quantity approaches the target setpoint power output quantity at a third predetermined time.
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11. A control and/or regulating device for an internal combustion engine, comprising:
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an instruction set programmed on a computer that, when executed, causes the computer to perform the following steps; determining an intended power output based on a gas pedal operation; determining an instantaneous setpoint power output quantity of a drive unit from the intended power output, maximal possible output torque of an engine at nominal speed, and minimal possible output torque of an engine at an instantaneous speed, 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; for a change limitation, reducing, at least intermittently, a rate at which the instantaneous setpoint power output quantity approaches a target setpoint power output quantity corresponding to a later transmission ratio, the reducing occurring at least one of during and after a change limitation period corresponding to a change in the instantaneous transmission ratio from an earlier transmission ratio to the later transmission ratio; 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 reducing the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity, until the instantaneous setpoint power output quantity reaches an intermediate value at least approximately equal to the minimum possible power output quantity corresponding to the later transmission ratio, at which point reduction of the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity is activated; the change limitation is activated in an event of a gear shift at a first predetermined time, the change limitation remaining active until a second predetermined time; and subsequent to the second predetermined time, a time constant of the change limitation is brought to a value of 1, so that the instantaneous power output quantity approaches the target setpoint power output quantity at a third predetermined time.
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12. An internal combustion engine for a motor vehicle, comprising:
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a control and/or regulating device programmed with an instruction set that, when executed, causes the control and/or regulating device to perform the following steps; determining an intended power output based on a gas pedal operation; determining an instantaneous setpoint power output quantity of a drive unit from the intended power output, maximal possible output torque of an engine at nominal speed, and minimal possible output torque of an engine at an instantaneous speed, 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; for a change limitation, reducing, at least intermittently, a rate at which the instantaneous setpoint power output quantity approaches a target setpoint power output quantity corresponding to a later transmission ratio, the reducing occurring at least one of during and after a change limitation period corresponding to a change in the instantaneous transmission ratio from an earlier transmission ratio to the later transmission ratio; 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 reducing the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity, until the instantaneous setpoint power output quantity reaches an intermediate value at least approximately equal to the minimum possible power output quantity corresponding to the later transmission ratio, at which point reduction of the rate at which the instantaneous setpoint power output quantity approaches the target setpoint power output quantity is activated; the change limitation is activated in an event of a gear shift at a first predetermined time, the change limitation remaining active until a second predetermined time; and subsequent to the second predetermined time, a time constant of the change limitation is brought to a value of 1, so that the instantaneous power output quantity approaches the target setpoint power output quantity at a third predetermined time.
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Specification