Method for electrohydraulically controlling a motor vehicle transmission and electrohydraulic controller for a motor vehicle transmission
First Claim
1. A method for electrohydraulically controlling a motor vehicle transmission, which comprises the steps of:
- using a pressure regulating valve to convert a control current into an activation pressure for a transmission actuator;
feeding back the control current and the activation pressure at a given time to a regulator; and
using the regulator to convert a setpoint value for the activation pressure of the transmission actuator into the control current, a conversion being dependent on at least one of the control current at the given time and the activation pressure at the given time.
1 Assignment
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Accused Products
Abstract
A control current is converted into an activation pressure for a transmission actuator by a pressure regulating valve. Both a control current at a given time and the activation pressure at the given time are fed back to a regulator. A setpoint value for the activation pressure in a partial range of a torque to be transmitted is converted by the regulator into the control current in dependence on the control current at the given time and otherwise as a function of the activation pressure at a given time. The current measuring device for determining the control current at the given time is adjusted here in such a way that a high resolution is obtained in the partial range.
1 Citation
6 Claims
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1. A method for electrohydraulically controlling a motor vehicle transmission, which comprises the steps of:
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using a pressure regulating valve to convert a control current into an activation pressure for a transmission actuator;
feeding back the control current and the activation pressure at a given time to a regulator; and
using the regulator to convert a setpoint value for the activation pressure of the transmission actuator into the control current, a conversion being dependent on at least one of the control current at the given time and the activation pressure at the given time. - View Dependent Claims (2, 3, 4)
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5. An electrohydraulic controller for a motor vehicle transmission, comprising:
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a pressure regulating valve for converting a control current into an activation pressure for a transmission actuator;
a regulator for converting a setpoint value for the activation pressure into the control current in dependence on one of the control current at a given time and the activation pressure at the given time;
a current measuring device connected between said regulator and said pressure regulating valve, said current measuring device feeding back the control current at the given time to said regulator; and
a pressure sensor connected between said regulator and said pressure regulating valve, said pressure sensor feeding back the activation pressure at the given time to said regulator. - View Dependent Claims (6)
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Specification