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Date May 2018 Marks available 2 Reference code 18M.2.SL.TZ0.6
Level SL Paper 2 Time zone no time zone
Command term Identify Question number 6 Adapted from N/A

Question

The electronic control unit (ECU) of a vehicle is an on-board computer that is constantly monitoring the performance of several components of a vehicle. For example, the ECU:

The software embedded in an ECU receives input data from a variety of sources when it runs auto-diagnostic tests.

With relation to the activities that the software of an ECU has to perform, identify two of the sources that provide input data to the ECU.

[2]
a.i.

With relation to the activities that the software of an ECU has to perform, suggest one reason why the auto-diagnostic program in the ECU depends upon the make and model of the vehicle.

[2]
a.ii.

Vehicles are tested for their exhaust gas emissions using simulation software at specialist garages. During a period of 5 minutes, a vehicle with the engine switched on is monitored for emissions of carbon dioxide (CO2) and fine particulates. The software uses 3D visualization techniques to display these parameters on a screen for the whole duration of the test.

Explain how emissions of CO2 and fine particulates could be represented in 3D by the software.

[4]
b.

Markscheme

Award [2 max].
Award [1] for each of the two requested elements that provide input.

Accept any ATD sensor explicitly stated by name.
Accept: speedometer, fuel gauge, brake pads, human pushing a button.
Do not accept: temp regulation unit (or any unit that is integrated in ECU).

a.i.

Award [2 max].
May depend on the car maker and patents may be involved;
For example, internal communications protocols across different systems may not be revealed;

Different vehicles have different uses;
It doesn’t make sense to have the same firmware for different requirements;

Different models operate at different parameters,
Requiring different algorithms;

Different Countries may have different regulations;
Therefore country-specific ECUs for the same model/type of car;

a.ii.

Award [4 max] for one example with explanations.

Example answers:
The quantity and/or direction of diffusion of CO2 and fine particulates can be mapped using colour plots;
Over the whole duration of the test in a 3D space;
Choosing a colour in an intuitive way;
To show how the density evolves over time;

Examples:
Plotting 3D points for CO2 with vectors x,y,z ; // can be given BOD
Where x = time;
y = density of CO2;
z = temperature;

Note: Do not accept generic answers that describe the process of 'rendering'.

b.

Examiners report

[N/A]
a.i.
[N/A]
a.ii.
[N/A]
b.

Syllabus sections

Option B: Modelling and simulation » B.1 The basic model
Option B: Modelling and simulation

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