Arrangement and a process for controlling a starting device of a vehicle drive
First Claim
1. Process for controlling a starting of a motor vehicle drive that has a driving engine and a starting device, comprising the steps of:
- using quantities such as a position of a power control element of the driving engine, an input rotational speed of the starting device, and an output rotational speed of the starting device; and
carrying out in two phases a starting operation for the motor vehicle using a control arrangement, said phases including a first phase forming a first command variable signal input to a first control unit supplying a first actuating signal for controlling an actuator for the starting device in order to vary the input and output rotational speeds, in which during said first phase the input rotational speed generated from an input rotational speed generator coupled to the starting device is led to a desired rotational speed determined by a first characteristic curve converter, and a subsequent second phase forming a second command variable signal input to said first control unit supplying the first actuating signal for controlling the actuator for the starting device, in which during said second phase a rotational speed difference signal formed in a difference forming unit from the difference between the input rotational speed and the output rotational speed is led along a desired course to a zero value.
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Accused Products
Abstract
A starting operation for a vehicle is carried out in two phases, specifically in a first phase, the input rotational speed is led to a desired rotational speed, and in a following second phase, a rotational speed difference signal formed from the difference between the input rotational speed and the output rotational speed is led to the zero value according to a predetermined desired course. The first phase begins when the starting device is not completely closed and the position of the power control element is below a limit value. The desired rotational speed is first determined as a function of the position of the power control element, the time variation of the position, and a signal describing the driver'"'"'s driving style. With the determined desired rotational speed, a desired curve of a control signal for an actuator of the starting device is then determined in such a manner that, in the case of the actual position of the power control element, this desired rotational speed is definitely reached. The second phase of the starting operation begins when the input rotational speed signal has approximately reached the desired rotational speed or when a predetermined driving speed is reached. A rotational speed difference signal, that is, the slip existing in the starting device, is led toward zero according to a desired curve. The thermal stress to the clutch is used for influencing the starting operation in that the desired rotational speed is determined as a function of this stress.
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Citations
18 Claims
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1. Process for controlling a starting of a motor vehicle drive that has a driving engine and a starting device, comprising the steps of:
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using quantities such as a position of a power control element of the driving engine, an input rotational speed of the starting device, and an output rotational speed of the starting device; and carrying out in two phases a starting operation for the motor vehicle using a control arrangement, said phases including a first phase forming a first command variable signal input to a first control unit supplying a first actuating signal for controlling an actuator for the starting device in order to vary the input and output rotational speeds, in which during said first phase the input rotational speed generated from an input rotational speed generator coupled to the starting device is led to a desired rotational speed determined by a first characteristic curve converter, and a subsequent second phase forming a second command variable signal input to said first control unit supplying the first actuating signal for controlling the actuator for the starting device, in which during said second phase a rotational speed difference signal formed in a difference forming unit from the difference between the input rotational speed and the output rotational speed is led along a desired course to a zero value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A control arrangement for a driving engine and a starting device connected behind said driving engine, comprising:
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a first generator for outputting a position of a power control element of the driving engine; a second generator for outputting an input rotational speed signal of the starting device; a third generator for outputting an output rotational speed signal of the starting device; a difference forming device coupled to the second and third generators for determining a rotational speed difference signal as a difference between the input rotational speed signal and the output rotational speed signal; a first characteristic curve converter coupled to the first generator for determining a desired rotational speed as a function of the signal of the first generator; a first control device which, in a first phase of the starting operation, generates a difference actuating signal in such a manner that the input rotational speed signal is led to the desired rotational speed signal and in a second phase, generates the difference actuating signal in such a manner that the rotational speed difference signal changes at a rate which is a function of the size of the rotational speed difference signal; a second characteristic curve converter coupled to the first generator for determining a first actuating signal as a function of the position of the power control element, the input rotational speed signal and the desired rotational speed; a second control device for determining a second actuating signal from the first actuating signal and an application actuating signal; and an actuating device which controls the starting device so as to vary the input and output rotational speed signals, said actuating device controlling the starting device according to the sum of the second actuating signal and the difference actuating signal. - View Dependent Claims (18)
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Specification