p112h0.pdf

CH-2

CHASSIS — P112 HYBRID TRANSAXLE

SHIFT CONTROL SYSTEM

1. General

A compact selector lever (transmission shift assembly), which has been designed under a new concept,

has been adopted in the instrument panel. It is a momentary shift type that returns to the home position

when the driver’s hand is released from the shift knob after a shifting operation. It can be shifted with a

fingertip, and the ergonomically designed shifting pattern offers excellent ease of operation.

A shift-by-wire technology has been adopted. A shift position sensor provided in the transmission shift

assembly detects the shift position (“R”, “N”, “D”, or “B”) and sends a corresponding signal to the HV

ECU. The HV ECU controls the speed of the engine, MG1, and MG2, in order to produce an optimal gear

ratio.

The parking lock mechanism of the ’03 Prius is operated through a linkage. In contrast, the ’04 Prius has

adopted an electrical control in the same way as the shift control.

With this mechanism, when the driver presses the Parking switch located on the top of the transmission

shift assembly, the “P” position control actuates the shift control actuator located in the hybrid transaxle

in order to mechanically lock the counter driven gear, which engages the parking lock.

System Diagram

CAN

ECM

Hybrid

Transaxle

Shift Control

Actuator

“P” Position

Switching

Signal

Shift Control Actuator

Position Signal

Indicator

Illumination

Signal

Parking Switch

Shift

Control

Signal

Transmission

Control ECU

Parking Switch

Indicator

“P” Position

Condition

Signal

“P” Position

Switching

Signal

BEAN

Power Source

Control ECU

HV ECU

Selector Lever

Operation

Signal

Stop Light

Switch

Transmission

Shift Assembly

255CH05

CH-3

CHASSIS — P112 HYBRID TRANSAXLE

2. Layout of Main Components

Combination

Meter

Parking

Switch

Multi Display

Gateway ECU

HV ECU

ECM

Transmission Control

ECU

Stop Light

Switch

DLC3

Transmission Shift

Assembly

Inverter Assembly

Hybrid Transaxle Assembly

(with MG1, MG2

and Planetary Gear Unit)

255CH18

CH-4

CHASSIS — P112 HYBRID TRANSAXLE

3. Construction

The configuration of the shift control system in the ’04 Prius is shown in the following chart.

ECM

SHIFT POSITION

SENSOR

CANH

CAN

AVC-LAN

VSX1, VSX2

CANL

MULTI DISPLAY

SHIFT SENSOR

VSX3, VSX4

SELECT SENSOR

HV ECU

GATEWAY

ECU

PARKING SWITCH

METER ECU

BEAN

POWER SOURCE

CONTROL ECU

PPOS

PCON

MPX1, MPX2

IND

SHIFT CONTROL

ACTUATOR RELAY

BMA

DATA LINK

CONNECTOR3

SIL

TRANSMISSION

CONTROL

ECU

SHIFT CONTROL

ACTUATOR

MUA

SHIFT CONTROL

MOTOR

MVA

AUXILIARY

BATTERY

MWA

RA, RB, RZ1

ROTATION ANGLE

SENSOR

255CH06

CH-5

CHASSIS — P112 HYBRID TRANSAXLE

4. Function of Main Components

Item

Outline

This sensor, which is installed in the Transmission shift assembly, detects the

shift positions (“R”, “N”, “D”, and “B”), and transmits the positions to the HV

ECU.

Shift Position

Sensor

•

When the Parking switch is pressed, the shift control actuator operates to

engage the parking lock in the hybrid transaxle.

Shift Control Actuator

•

When the shift position is in the “P” and the brake pedal is pressed, if the

driver operates the selector lever, this actuator operates to unlock the parking

lock in the hybrid transaxle.

•

As this switch turns ON or OFF, it detects the driver’s operation of the P

position, and sends it to the HV ECU.

Parking Switch

•

This is a momentary type switch, and indicates a status whether the parking

lock is applied or not with an indicator light on the switch.

•

Transmission Control ECU, Upon receiving an ON signal of the Parking

switch from the HV ECU, the transmission control ECU actuates the shift

control actuator.

Transmission Control

ECU

•

It illuminates the P position indicator light in accordance with the switching

condition of the P position.

•

Upon receiving an ON signal from the Parking switch, the HV ECU

determines whether the conditions for shifting into the P position have been

met, and transmits a shift control actuator control signal to the transmission

control ECU.

•

The shift position sensor installed on the transmission shift assembly detects

the shift position (“R”, “N”, “D”, or “B”) and sends a signal to the HV ECU.

The HV ECU produces an optimal gear ratio by controlling the speeds of the

engine, MG1, and MG2.

HV ECU

•

If the HV ECU receives a vehicle power supply OFF signal from the power

supply ECU when the parking lock in the hybrid transaxle is not engaged,

the HV ECU transmits a P position switching signal to the transmission

control ECU in order to engage the parking lock.

The ECM receives from the HV ECU an engine control signal that suits the

shift position that the driver has selected, in order to optimally control the

engine.

ECM

•

Transmits a signal to the HV ECU, indicating that the vehicle power supply

has been turned ON or OFF.

Power Source

Control ECU

•

Transmits a request signal to the transmission control ECU, commanding

that changes the shift position to the “P” position. This signal is transmitted

only if the shift position is in other than the “P” position when the POWER

switch is turned OFF.

Stop Light Switch

Detects the brake pedal depressing signal.

•

Illuminates the shift position indicator, which the driver has selected, in

accordance with the signal from the HV ECU.

Combination Meter

•

Illuminates the master warning light if abnormality has occurred in the

transmission control ECU.

•

Displays a warning message to alert the driver in accordance with a signal

provided by the transmission control ECU.

Multi Display

CH-6

CHASSIS — P112 HYBRID TRANSAXLE

5. Transmission Shift Assembly

General

A compact selector lever, which has been designed under a new concept, has been adopted. It is a

momentary shift type in which the reactive force of a spring returns the lever to its home position when

the driver’s hand is released from it after a shifting operation.

The transmission shift assembly has built-in shift position sensors (select sensor and shift sensor) to

detect the shift position (“R”, “N”, “D”, and “B”).

When the taillights are turned ON, a light bulb that is provided in the housing indirectly illuminates the

shift knob indicator surface, in order to enhance its nighttime visibility.

Select Sensor

Shift Sensor

255CH07

Shift Knob Indicator

The shift knob indicator is constructed in such a way that when a light bulb that is provided in the housing

illuminates, its light beam passes through a light guide housing and is reflected on the selector lever’s pole

and the light transmission area, thus illuminating the indicator surface from underneath the knob.

Indicator Surface

Light Bulb

255CH11

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