Process for controlling an automatic transmission
First Claim
1. A process for controlling an automatic transmission of a vehicle by an electronic transmission control (4), the process comprising the steps of:
- setting a low road friction drive state for the automatic transmission upon detection of one of slip between driven and non-driven gears of the vehicle and active ABS deceleration (ABS=1);
determining a value by one of;
evaluating an active ABS deceleration function (S5 to S7), from one of an actual acceleration of the vehicle and a parameter (e.g., gear speed increase) corresponding to the actual acceleration, and evaluating a slip determination function (S8 to S10), from one of a comparison between a theoretical acceleration and the actual acceleration a(DIFF) and a parameter (e.g., torque reserve) corresponding to the comparison between the theoretical acceleration and the actual acceleration; and
activating via the electronic transmission control (4) a winter operation mode (S15) when the value (Z) exceeds (Z>
Z(IN)) a limit value (Z(IN)).
1 Assignment
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Accused Products
Abstract
In a process for control of an automatic transmission (3) in a vehicle, it is proposed to set an electronic transmission control (4) for a driving state low friction value when slip is detected on the input gears of the vehicle or an ACS deceleration is detected. In an ACS deceleration a meter is determined, via an ACS evaluation function, from the actual acceleration of the vehicle or a parameter (e.g., gear speed increase) corresponding to the actual acceleration. When slip occurs, a meter is determined, via a slip evaluation function, from the theoretical/actual comparison of the vehicle acceleration or a parameter (e.g., torque reserve) corresponding to said comparison. In both an ACS deceleration or when a slip occurs, a winter operation mode is then activated when the meter count exceeds a limit value.
50 Citations
12 Claims
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1. A process for controlling an automatic transmission of a vehicle by an electronic transmission control (4), the process comprising the steps of:
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setting a low road friction drive state for the automatic transmission upon detection of one of slip between driven and non-driven gears of the vehicle and active ABS deceleration (ABS=1);
determining a value by one of;
evaluating an active ABS deceleration function (S5 to S7), from one of an actual acceleration of the vehicle and a parameter (e.g., gear speed increase) corresponding to the actual acceleration, and evaluating a slip determination function (S8 to S10), from one of a comparison between a theoretical acceleration and the actual acceleration a(DIFF) and a parameter (e.g., torque reserve) corresponding to the comparison between the theoretical acceleration and the actual acceleration; and
activating via the electronic transmission control (4) a winter operation mode (S15) when the value (Z) exceeds (Z>
Z(IN)) a limit value (Z(IN)).- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A process for controlling an automatic transmission of a vehicle by an electronic transmission control (4), the process comprising the steps of:
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setting a low road friction drive state for the automatic transmission upon detection of one of slip between driven and non-driven gears of the vehicle and active ABS deceleration (ABS=1);
determining a value by one of;
evaluating an active ABS deceleration function (S5 to S7), from one of an actual acceleration of the vehicle and a parameter (e.g., gear speed increase) corresponding to the actual acceleration, and evaluating a slip determination function (S8 to S10), from one of a comparison between a theoretical acceleration and the actual acceleration a(DIFF) and a parameter (e.g., torque reserve) corresponding to the comparison between the theoretical acceleration and the actual acceleration;
determining a value offset (Z(OFF) between the value (Z) with respect to a characteristic line and an actual value (Z) is calculated from the value (Z) plus the value offset (Z(OFF)) (Z=Z+Z(OFF)); and
activating via the electronic transmission control (4) a winter operation mode (S15) when the actual value (Z) exceeds (Z>
Z(IN)) a limit value (Z(IN)).
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12. A process for determining a low road friction drive state for an automatic transmission of a vehicle by an electronic transmission control (4) based solely on an actual and theoretical acceleration of the vehicle, the process comprising the steps of:
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detecting one of slip between driven and non-driven gears of the vehicle and active ABS deceleration (ABS=1);
determining a frictional resistance value by one of;
evaluating an active ABS deceleration function (S5 to S7), from one of the actual acceleration of the vehicle and a parameter (e.g., gear speed increase) corresponding to the actual acceleration, and evaluating a slip determination function (S8 to S10), from one of a comparison between the theoretical acceleration and the actual acceleration a(DIFF) and a parameter (e.g., torque reserve) corresponding to the comparison between the theoretical acceleration and the actual acceleration; and
activating via the electronic transmission control (4) a winter operation mode (S15) when the value (Z) exceeds (Z>
Z(IN)) a limit value (Z(IN)).
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Specification