Automated Transmission Control for Smooth Creep Mode Transition
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Solution Overview
Problem
Existing automated transmission systems in motor vehicles experience sudden jerks or delays when transitioning from creep mode to continuous control mode, as they rely on speed thresholds to select control modes, leading to inadequate interpretation of the driver's wishes regarding pedal input.
Innovation Solution
A control method and device that utilize a data acquisition and storage unit, computer, and operating point optimizer to process and filter data from pedals and environmental sensors, ensuring continuous control setpoint variation and smooth transitions by using continuous curves and mathematical formulas to calculate torque instructions, eliminating sudden jerks and delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If speed threshold is used to select control mode, then mode selection is simplified, but sudden jerks or delays occur during mode transition
Solution Approach 1:
The patent changes the control parameter from discrete speed threshold comparison to continuous acceleration rate calculation. Instead of selecting modes based on whether speed exceeds a threshold, the system continuously calculates acceleration rate and uses it to modulate the control instruction, ensuring smooth transitions without sudden jerks or delays.
Solution Approach 2:
The patent makes the control instruction dynamic by continuously adjusting it based on the calculated acceleration rate. The control instruction is no longer fixed for each mode but varies continuously with the driver's pedal input and vehicle state, providing smooth transitions and faithful interpretation of driver wishes.
2Device complexity
If discrete mode selection is used, then control logic is simpler, but faithful interpretation of driver wishes is compromised
Solution Approach 1:
The patent implements continuous feedback by calculating the acceleration rate from current and previous vehicle states and using it to adjust the control instruction. This closed-loop approach ensures that the control system continuously adapts to the driver's intentions, faithfully interpreting pedal inputs without the information loss inherent in discrete mode selection.
Solution Approach 2:
The patent ensures continuous control instruction generation based on the acceleration rate, eliminating the discontinuities introduced by discrete mode switching. The control instruction varies continuously with the driver's input, maintaining faithful interpretation of driver wishes throughout the entire operating range.
Data Source
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AI summary
The invention relates to a method for controlling the automated transmission of a power train in an automobile that comprises the following steps: a) measuring a plurality of variables, including the depression level of the brake pedal, the depression level of the accelerator pedal and an instant speed of the automobile, the instant speed being included within an interval ranging from the minimum speed to the maximum speed of the vehicle, the control setting is calculated following a ramp method when the instantaneous speed (V) is below a ramp threshold value (Vr) and the depression level of the accelerator pedal is zero. b) determining a steering set point of at least two of the driving wheels of the automobile based on the variables measured during step a). According to the invention, the determination in step b) is carried out so that the steering set point varies in a continuous manner over the entire speed variation interval, in particular when the instant speed of the vehicle is different from zero and lower than a creeping threshold value and when the depression level of the accelerator pedal change from a value equal to zero to a value different from zero.