Datasets

gengine1 and gengine2

We provide two datasets gengine1 and gengine2. Each dataset consists of N measurements of the gasoline engine D = {d₁,...,d_N}. Each measurement d = {(u₁, y₁),...,(u_T, y_T)} contains a trajectory of length T where the inputs are denoted as u_t and the outputs as y_t. The length of the trajectory may vary between measurements. The data points are recorded every 10 Hz. Each measurement is saved as a separate csv-file. The data is standardized to mean-zero and unit-variance on the training data set.

gengine1

The dataset gengine1 contains in total 33 measurements. We used the measurements [10,11,12,13,14,15,16,17,18,19,30,31,32,33,34,35,36,37,38,39] for training and the measurements [53,54,55,56,57,58,59,60,61,62,63,64,65] for testing.

The first 5 columns correspond to the inputs u_t:

• Speed
• Load
• Lambda
• Ignition Angle
• Fuel Cutoff

The last 8 columns correspond to the outputs y_t:

• Particle Numbers
• CO
• CO2
• HC
• Nox
• O2
• Temperatue (Exhaus Manifold)
• Temperate (Catalyst 1)

gengine 2

The dataset gengine2 contains in total 22 measurements. We used the measurements [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15] for training and the measurements [16,17,18,19,20,21] for testing.

The first 4 columns correspond to the inputs u_t:

• Speed
• Load
• Lambda
• Ignition Angle

The last 5 columns correspond to the outputs y_t:

• Particle Numbers
• HC
• Nox
• Temperatue (Exhaus Manifold)
• Temperature (Catalyst 1)

pengines

In the folder ./pengines, we provide two datasets pengines/engine1.xlsx and pengines/engine2.xlsx. These two files are measurements of the same system under different conditions. Each dataset consists of N measurements of data pair (x_n, y_n). Each column is standardized to zero-mean and unit-variance. Each file contains an additional sheet providing quantiles of the standardized data. Additionally, the operating an engine usually has safety concern. We thus provided suggested safety values (engines_transfer_learning_problem/safety_constraint.xlsx).

In these files, the first 4 columns correspond to the inputs x_n:

• engine_speed
• engine_load
• intake_valve_opening
• air_fuel_ratio

The last 7 columns correspond to the outputs y_n:

• specific_fuel_consumption
• temperature_exhaust_manifold
• temperature_in_catalyst
• engine_roughness_v (variance of indicated cylinder pressure)
• engine_roughness_s (standard deviation of indicated cylinder pressure, we mainly use this one)
• HC
• NOx

Contact Persons

Barbara Rakitsch: barbara.rakitsch@de.bosch.com Cen-You Li: cen-you.li@de.bosch.com