E ECD0106 [PDF]

Zitiervorschau

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SERVICE BULLETIN FUEL INJECTION PUMP

ECD 01-06 November, 2001

NEW PRODUCTS DENSO AUTHORIZED ECD SERVICE DEALER ONLY

SUBJECT: New ECD-V4 Type Pumps Pump Type

Part Number

Customer

Vehicle Model

Engine Type

Destination

ECD-V4

098000-033#

TOYOTA

LAND CRUISER 100

1HD-FTE

Europe

1. Introduction A new ECD-V4 type pump has been introduced for direct-injection engines. Compared to the conventional type, the most characteristic feature of this pump is the addition of the pre-stroke control. This control improves the drivability of the vehicle by improving the low-speed torque during start-offs.

QC0826

SERVICE DEPARTMENT 0111-IT-180 Printed in Japan QAANC-03

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2. Pre-stroke Control With respect to the injection pumps in which the operating pressure increases year by year, the conventional ECD-V4 type has also been meeting the performance levels required by the engines, including high power, high torque, and low exhaust emissions. The pre-stroke control has recently been added in an effort to improve the operation performance of the vehicle at low speeds. Specifically, the SPV actuating current from the EDU is varied at low speeds, which effectively varies the pressure and regulates the injection volume.

Actuation pulse

Actuation current

ECU

Solenoid valve

EDU

SPV

Spill High pressure

Suction QC0827

Pump cam angle signal

0

1

2

3

with pre-stroke

Open

SPV

4

5

6

7

8

9

A

B

0

1

2

Pre-stroke volume controlled by SPV closed duration

Closed without pre-stroke

Injection volume controlled by SPV open duration

Cam

Injection pressure

Injection rate Pre-stroke volume QC0828

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Reference: To address the needs for lowering the pressure in the idle-speed range and raising the pressure in the low-speed, high-load range, the pressure control achieved with the pre-stroke control effectively enhances the drivability of the vehicle in the low-speed range.

High-speed, high-load range

Low-speed, high-load range

Increased power through high pressure

Increased torque through high pressure

Injection volume

Vehicle start-off

Exhaust mode range Reduced emissions through high pressure

Idle-speed range Reduced noise through low pressure

Low-speed range

Engine speed QC0829