multitronic — Das neue Automatikgetriebe von Audi

Nowatschin, Klaus; Fleischmann, Hans-Peter; Gleich, Thorsten; Franzen, P.; Hommes, Georg; Faust, Hartmut; Friedmann, Oswald; Wild, Horst

doi:10.1007/bf03224292

Cited by 11 publications

(4 citation statements)

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“…The launch behavior, therefore, can be improved by ensuring a solely rising engine speed [47] or should at least not drop more than 250 rpm according to the subject study. Additionally, during clutch slip phases the engine speed can be influenced by the clutch torque [5] and hence decreasing the engine speed is only achieved by increasing the clutch torque over the engine torque, or by requesting an engine intervention.…”

Section: Engine Speed Objectivementioning

confidence: 99%

Target State Optimization: Drivability Improvement for Vehicles with Dual Clutch Transmissions

Schmiedt

Rinderknecht

2022

Applied Sciences

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Vehicles with dual clutch transmissions (DCT) are well known for their comfortable drivability since gear shifts can be performed jerklessly. The ability of blending the torque during gear shifts from one clutch to the other, making the type of automated transmission a perfect alternative to torque converters, which also comes with a higher efficiency. Nevertheless, DCT also have some drawbacks. The actuation of two clutches requires an immense control effort, which is handled in the implementation of a wide range of software functions on the transmission control unit (TCU). These usually contain control parameters, which makes the behavior adaptable to different vehicle and engine platforms. The adaption of these parameters is called calibration, which is usually an iterative time-consuming process. The calibration of the embedded software solutions in control units is a widely known problem in the automotive industry. The calibration of any vehicle subsystem (e.g., engine, transmission, suspension, driver assistance systems for autonomous driving, etc.) requires costly test trips in different ambient conditions. To reduce the calibration effort and the accompanying use of professionals, several approaches to automize the calibration process are proposed. Due to the fact that a solution is desired which can optimize different calibration problems, a generic metaheuristic approach is aimed. Regardless, the scope of the current research is the optimization of the launch behavior for vehicles equipped with DCT since, particularly at low speeds, the transmission behavior must meet the intention of the driver (drivers tend to be more perceptive at low speeds). To clarify the characteristics of the launch, several test subject studies are performed. The influence factors, such as engine sound, maximal acceleration, acceleration build-up (mean jerk), and the reaction time, are taken into account. Their influence on the evaluation of launch with relation to the criteria of sportiness, comfort, and jerkiness, are examined based on the evaluation of the test subject studies. According to the results of the study, reference values for the optimization of the launch behavior are derived. The research contains a study of existing approaches for optimizing driving behavior with metaheuristics (e.g., genetic algorithms, reinforcement learning, etc.). Since the existing approaches have different drawbacks (in scope of the optimization problem) a new approach is proposed, which outperforms existing ones. The approach itself is a hybrid solution of reinforcement learning (RL) and supervised learning (SL) and is applied in a software in the loop environment, and in a test vehicle.

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Section: Engine Speed Objectivementioning

confidence: 99%

Target State Optimization: Drivability Improvement for Vehicles with Dual Clutch Transmissions

Schmiedt

Rinderknecht

2022

Applied Sciences

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“…In the most recent nine-speed automatic transmissions, both for inline and FWD arrangements, values up to 7,200 g must be taken into consideration and made sustainable by means of a suitable design (Figure 2). For the CVT, the advantages of the LuK chain with low-friction rocker joints compared to other CVT linking elements [2,3] are being increasingly implemented on the market with an improved fuel consumption of up to 4 %. Starting with applications that have a high torque of 400 Nm, chains with smaller pitch lengths are now being used as well.…”

Section: Reducing Consumption By Means Inside the Transmissionmentioning

confidence: 99%

Powertrain Systems of the Future

2014

Solving the Powertrain Puzzle

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“…Fuel consumption (MVEG cycle) and dynamic properties (0-100 km/h) comparison in Audi A6 2.8 vehicle equipped with AT, MT and CVT[13] Operating condition estimation of the CVT transmission (mathematical model)[9] Schematic diagram of standard control system of CVT powertrain…”

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confidence: 99%

Possibilities of Driveability and Fuel Consumption Improvement by Advanced Control Power Transmission System in Passenger Car

2007

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The correct work of a power transmission system for the sake of a car motion properties, fuel consumption and pollution emission, requires proper control of an engine and power transmission system. This problem becomes especially significant in the case of automation of the power transmission system and particularly regarding the system of constant gear ratio change between the engine and drive wheels (Continuously Variable Transmission), examined in the paper. This control is based on friction degree conditions estimation between metal belt and the transmission wheels. This paper also describes the experimental results of bench test and road test and applying of different control strategies.

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multitronic — Das neue Automatikgetriebe von Audi

Cited by 11 publications

References 0 publications

Target State Optimization: Drivability Improvement for Vehicles with Dual Clutch Transmissions

Target State Optimization: Drivability Improvement for Vehicles with Dual Clutch Transmissions

Powertrain Systems of the Future

Possibilities of Driveability and Fuel Consumption Improvement by Advanced Control Power Transmission System in Passenger Car

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