LPG VehicleLPG VehicleIntroducing LPG Vehicle which is ecological and Introducing LPG Vehicle which is ecological and

complies with variety of resourcescomplies with variety of resources

Yasuo NakaharaToyota Motor Corporation

10 10 January 2001January 2001

Agenda

(1) Safety of LPG vehicles

(2) Introducing the LPG-taxi in Hong Kong

(3) Comparison on Performance of LPG vehicle and others (CNG, Petrol & Diesel)

(4) Future Consideration

(1) Safety of LPG vehicles

UIO of LPG vehicles around the world The situation of how LPG vehicles are used worldwide Government Project: Success & expansion in HK and Australia

UIO of LPG-taxi in Japan Approx. 260,000 units are recorded

0

5

10

15

20

25

30

年

保有

台数

（万

台）

保有台数

・ From 1905~No explosion accidents reported・ From 1990~No accidents in fire reported

Outline of LPG Engine System 　 Safety Device of LPG Engine System

Although the ignition switch is turned on in case of starter is off and engine revolution is under 15r.p.m, the Solenoid Valves do not open and LPG is not supplied to the engine. It is confirmed at our collision test that LPG Regular is located on safety area.

Safety Device (I)Charging ValveA safety valve is fitted inside the charging valve and will discharge gas out to atmosphere when internal pressure of the LPG tank exceeds the specification level. (20-24kg/cm 2)

Overflow Protector Valve (Outlet Valve)

This device is fitted inside the Outlet valve which allows flow of LPG gas from the LPG tank to engine.

Overcharge Protector ValveOvercharge protector valve is fitted inside the LPG tank to prevent LPG gas from being overcharged and limits filling the tank up to 85% of tank capacity.

In case of the pressure in the LPG tank increases due to abnormal heat, etc, the safety valve releases the pressure by discharging gas out and cools down the LPG tank by evaporation.

Therefore, the safety valve will be discharging gas out intermittently in order to control the pressure and prevent damage of LPG tank.

In case the fuel pipe to the engine is broken, the overflow protector valve will immediately shut off the outflow of LPG gas.

In case of a pressure in the LPG tank increase, the expansion volume (15%) will absorb any increasing pressure by liquid expansion and prevent damage of LPG tank.

1 2 3

1

2

3

Charging Valve (Gray Color)

This valve will open when refilling of fuel. In case of the pressure in the LPG tank increases abnormally safety valve will discharges gas.

1

Outlet Valve (Red Color)

This valve take out gas to engine and ordinary full-open. The overflow protector valve is fitted at the tip (inside the LPG tank) of this valve. In case fuel pipe to the engine is broken in an accident, etc, fuel flow will be shut off by this device to prevent leaking gas. In case of fire hazard, close this valve, and keep away from the vehicle.

2

Overcharge Protector Valve

When the fuel is filled up to 85% the valve will prevent LPG to being overcharge.

3

LPG Tank

Semi-Container

Outside the

vehicle

Charging Valve Outlet

Valve

Safety Device (II)

Emergency Shut-Off valveThis device will shut off the fuel flow from the LPG tank, when the engine is stopped (does not run) This valve operates according to ON OFF signal from engine control computer that is output when engine run is down under 15r.p.m and also the LPG manual switch located on the instrument panel/driver side.

Solenoid ValveThis device will shut off fuel flow into LPG regular.

Function and operation is same as emergency shut-off valve. (above(4))

When engine is OFF (dose not run) or in case of engine stop by abnormal condition (ex.engine stall etc.). LPG gas supply to the engine will be shut off by this device.

Note: This device can be forced “OFF” (Shut off) by switching the LPG manual switch to the neutral position.

This safety device is to prevent LPG gas leaking out during engine OFF (does not run) or the engine stops due to abnormal condition (ex. engine stall, engine stop by accident (etc.,) by shutting off fuel supply to engine.

In addition the driver can turn the fuel supply off by switching the LPG manual switch to neutral position.

4

5

4

5

(2) Introducing LPG-taxi in Ho

ng Kong

How we introduced LPG-taxi in Hong Kong

tank

Change of Inlet Valve from Japanese type to Australian type Addition of Non-return Valve

(3) Comparison on performance of LPG vehicle and oth

ers

1: Volume of Emission is large/Poor engine performance/High cost2: Volume of Emission is larger/Engine performance is not good/Higher cost3: Volume of Emission is smaller/Good engine performance/Lower cost4: Volume of Emission is small/Great engine performance/Low cost

Comparison on Performance Comparison of CNG, LPG, Petrol, and Diesel Vehicles Comparison on emission, fuel consumption, Maintenance

cost and usefulnessType of

Fuel

Petrol

Diesel

ＣＯ 2

4

3

2

4

ＣＯ

4

4

3

3

ＨＣ

3

3

3

2

PM

4

4

4

2

Engine performance

2 → 3 (w/MPI)

3 → 4 (w/MPI)

4

4

Cost

1

3

4

3

NOx

3

3

3

2

CNG

LPG

Logic of Emission of CO2

Type of Fuel

Petrol

LPG

Molecular Structure

Petrol=100

C8H18

C4H10

CH4

0.302

0.277

0.236

100

92

78

G-CO2/kcal

CNG

Operating Cost Case study of Hong Kong(Nov.,1997→Nov.,1998)

Diesel LPGFuel Consumption

HK$/km

km/Litre

0.78 0.64

8.88 7.36

Price　 of　 LPG ：$2.01

　　　　　 Diesel ：$6.71

Price　 of　 LPG ：$2.01

　　　　　 Diesel ：$6.71Most of the maintenance items of LPG taxi were the same as that

of diesel taxi and their repair costs were comparable.

Special Design for Hong KongMore Legroom

Handle of luggage is easier

Get on and off is easier

Comparison of CNG and LPG

at 10-15mode fuel consumption at same tank　 volume at 200kg/cm(CNG）

CNG LPG

１ /3 １Price of LPG in Japan is ￥５５／ Liter and CNG is￥８０／ Liter equivalent gasoline

Driving range

Engine Power１１

＊

Fuel　tank

(steel）

Weight

Air pressure of tank

Heavy

200

Medium

5~8

Reliability

ex/ friction in engine　valve seat　

High

＊

Low　

reported＊ There are only 5,000 units CNG-taxi in Japan.

Remarks　

LPG 96 Liter： 40kg CNG 168 Liter： 131kg Bigger and heavier tank is needed to maintain the same cruising range

＊ 0.9 when only fuel is substituted

(4) Future Consideration of LPG Vehicl

es

Future consideration of LPG vehicles

To make the fuel control system to electronic controlled carburetor

↓

Injection Control System to Inlet Valve (MPI)

・ Capable of controlling fuel precisely

(Comply with reinforce in the regulation of emission)

　　　・ Lower the suction resistance by using carburetor

To make the fuel control system to electronic controlled carburetor

↓

Injection Control System to Inlet Valve (MPI)

・ Capable of controlling fuel precisely

(Comply with reinforce in the regulation of emission)

　　　・ Lower the suction resistance by using carburetor

To have the similar output and emission as petrol vehicle

ConclusionConclusion

LPG vehicles are safe, their emission is small and their cost is low

Highly reliable as a taxi-cab

Highly recommend to introduce our LPG-taxi in Singapore