sem asia 2011 further comments technical

8/4/2019 Sem Asia 2011 Further Comments Technical

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ON YOUR MARK. GET SET. LETS GO. 1

Further comments on technical submissionsShell Eco-marathon Asia 2011Clutch (Articles 36 & 63)For solar, plug-in, hydrogen fuel cell vehicles, please ignore comments about the Clutch asthis only applies to internal combustion engines

Emissions & Exhaust (Articles 41 & 64)For solar, plug-in, hydrogen fuel cell vehicles, please ignore comments about the Emissions& Exhaust as this only applies to internal combustion engines

Sound (Articles 42 & 65)For solar, plug-in, hydrogen fuel cell vehicles, please ignore comments about the Emissions& Exhaust as this only applies to internal combustion engines

Emergency shutdown (Articles 43 & 66)1. An external emergency shutdown mechanism is mandatory2. Please make sure that it is not part of the detachable bodywork for driver

entry/exit (meaning to say that, even if the cover of the vehicle is removed theexternal emergency shutdown switch must still be connected to the vehicle itshould not be part of the cover). This is a new rule for 2011.

3.

The emergency shutdown switch must shut down the engine and isolate the batteryfrom all electrical systems

Hydrogen vehicles (Article 79)1. If energy from the fuel cell is to be stored, it must be stored only in a

supercapacitor (batteries are not allowed)2. The supercapacitor voltage must be easy to check from outside the vehicle (it

should have 2 external connection points to check the voltage before and after arun)

3. The emergency shutdown system must be able to be activated in 3 ways external,internal and leak detector

4. The emergency shutdown system must simultaneously stop motor relay andhydrogen solenoid valve

5. Please note the sequence of the hydrogen components: Tank > Regulator >Solenoid Valve > Flow meter > Fuel cell

6. No Teflon tape please7. Hydrogen flow meter must be EASILY VISIBLE from outside the vehicle with the

cover on (so preferably it should be located just inside the body cover, with aviewing window/hole)


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Hybrid vehicles (Article 77)1. It would be of help if you have a diagram of how the hybrid system works2. A supercapacitor is the only means by which energy produced by the internal

combustion engine or fuel cell can be stored. (batteries are not allowed)3. The supercapacitor voltage must be easy to check from outside the vehicle (it

should have 2 external connection points to check the voltage before and after arun)

4. The maximum voltage of the supercapacitor is 48 VInternal combustion engines (Articles 72-78)

1. Clutch engagement some teams are not clear about this.a. For internal combustion engines a clutch is mandatory.b. It is also mandatory that when the engine is idle (and with no brakes

applied) the car does not move.c. Use of the electric starter motor should not engage the clutch (i.e. should

not propel the vehicle)2. The fuel line between the tank and the engine must not include any additional

elements (no additional filters or valves).3. No electrical pumps allowed for fuel, oil or water. Only mechanical pumps are

allowed.4. Only Shell fuel tanks from e-Shop are allowed (otherwise we cannot measure the

fuel consumption)a. Only one fuel tank is allowedb. For gravity fed systems, a hole needs to be drilled at the top of the cover to

ensure fuel can flow5. Fuel pipes must be translucent & fuel compatible6. Fuel injection systems must have a safety valve, with a maximum pressure of 5 bar.7. Fuel injection systems must have pressure gauges.8. The exhaust pipe must exit the vehicle, BUT, must not extend beyond the rear of the

vehicle (it shouldnt stick out beyond the rear most part of the car body)9. If you think you are going to achieve a very high mileage, please ensure that your

fuel system can be completely removed for weighing

Starter light (Article 78)1. Not everyone is clear about what a starter light is.a. A starter light is NOT used to indicate that the engine is runningb. It is for internal combustion engines vehicles onlyc. It is used to indicate when the electrical starter motor (if present) is used. If

no electrical starter motor is used, then there should be no starter light.2. The starter light should be located at the rear end of the car and visible from both

sides of the track3. If possible it should be located on a permanent part of the vehicle body (like the

emergency shutdown button)


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Batteries (Article 71)There are 3 types of batteries used in the SEM event.

1. On-board battery2. Battery to power electric motors3. External battery

Batteries for different fuel categories: For internal combustion engines, only one battery is allowed on board. (Type 1) For solar and plug-in vehicles 2 batteries are allowed (Type 2 & Type 1) For hydrogen fuel cell vehicles, only one battery is allowed on board (Type 1), BUT

an external battery (Type 3) may be used to start the fuel cell at the startClarification on the battery types:1. On-board battery (or Auxiliary battery) all cars

Should only be for safety devices (horn, emergency shutdown mechanism,hydrogen sensor), lights, ignition.

Cannot be used for air compressors, cooling fans for fuel cells Cannot be used for fuel pumps Cannot be directly connected to the power train (should not be involved in

propulsion of the vehicle) Unless there is a good reason, this should be below 20 amp-hours Only one on-board battery is allowed (this is separate from the battery for

powering plug-in and solar vehicles)

A battery management system (BMS) is needed for all types of lithium batteries Please note that the definition of battery is that it appears as a single unitwith only 2 terminals. This battery may comprise of more than one sub-batteryconnected together as long as there are only 2 terminals from which power isdrawn2. Battery to power electric motors (plug-in and solar vehicles only)

This is separate from the on-board battery Its main function is to provide power to the power train A BMS (battery management system) is needed for lithium batteries A supercapacitor may be used in place of this battery for plug-in and solar

vehicles

3. External battery (hydrogen vehicles only) This may be used to start fuel cells only at the start line)

Supercapacitors1. Mandatory for storage of generated electricity in hybrid vehicles (Article 77)2. Possible alternative to batteries for plug-in and solar vehicles (Articles 80 & 81)3. Possible energy storage for energy produced from hydrogen fuel cell vehicles

(Article 79)


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Joulemeters (Articles 80 & 81)1. Mandatory for Solar (2 units) and Plug-in vehicles (1 unit)2. Some teams have not shown these in some of the electrical drawings for Solar

and Plug-in vehicles3. Please remember that it must be EASILY VISBLE from outside the vehicle with

the cover on (so preferably it should be located just inside the body cover, witha viewing window/hole)

Lights (Article 59 & 78)1. Brake lights are not mandatory for prototype vehicles2. Starter lights are mandatory for internal combustion categories where a starter

motor is used. See comment on Starter light

Fuel tanks (Article 74)1. Some teams seem to be planning to use their own tanks. Only Shell fuel tanks

from the e-Shop can be used. This is absolutely necessary for fuelmeasurement.

2. Ensure easy access to the fuel tank (with a 1 metre long burette)3. If there is a fuel return line, it should be to the fuel hose below the fuel tank (not

coming back into the fuel tank)4. Please remember to drill a hole in the cover for gravity fed systems (otherwise

the fuel wont flow)

Safety1. A bulkhead (separation panel) should completely separate the engine/motor

from the driver compartment no gaps2. For cars with wheels within the body, a bulkhead should separate the wheels

from the driver to prevent accidental contact with the driver3. The maximum voltage of any electrical component (including solar panels, fuel

cell, supercapacitors, batteries) on the vehicle must be 5 cm above the drivers helmet7. Independent brake systems are required for prototype cars (should be able to

stop the car with either front or back brakes)8. Make sure that chain/belt guards are present if you have a chain or belt drive9. The fire extinguisher should have valid expiry and be firmly attached to the

vehicle

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