# US 2014/0156156 A1 · Real time modeling of engine load addition due to alternator with an over-run clutch

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- Number: US 2014/0156156 A1
- Document ID: US20140156156A1
- Status: Published application
- Kind: A1
- Application number: 13/693,150
- Filed: 2012-12-04
- Published: 2014-06-05
- Earliest claimed: 2012-12-04
- Assignees: Fca US LLC
- Inventors: Songping Yu; Abdul Alkeilani; Anwar Alkeilani
- Web page: https://patentgrep.com/patent/US20140156156A1

## CPC

- F16D 48/06: Control by electric or electronic means, e.g. of fluid pressure
- F16D 2500/30401: On-off signal indicating the engage or disengaged position of the clutch
- F16D 2500/30415: Speed of the input shaft
- F16D 2500/30421: Torque of the output shaft
- F16D 2500/30426: Speed of the output shaft
- F16D 2500/3067: Speed of the engine
- F16D 2500/3165: Using the moment of inertia of a component as input for the control
- F16D 2500/5046: Preventing engine over-speed, e.g. by actuation of the main clutch
- F16D 2500/7041: Position
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES

## Abstract

A system and method for providing engine torque load in real time. The system includes a sensor to determine, in real time, a clutch state of an alternator clutch and a controller for determining an alternator torque value and applying the alternator torque value to the engine torque load in real time.

## Claims

### Claim 1

A system for providing, in real time, an engine torque load to an engine, said system comprising:
a sensor that determines, in real time, a clutch state of an alternator clutch; and
a controller adapted to:
calculate an alternator torque value; and
apply the alternator torque value to the engine torque load in real time.

### Claim 2 (depends on 1)

The system of claim 1, wherein the controller determines that an alternator load is disengaged from the engine when an alternator rotor speed is greater than an engine rotation speed.

### Claim 3 (depends on 1)

The system of claim 1, wherein the alternator clutch is an over-run clutch.

### Claim 4 (depends on 3)

The system of claim 3, wherein a first portion of the over-run clutch is coupled to an alternator, and a second portion of the over-run clutch is coupled to the engine.

### Claim 5 (depends on 1)

The system of claim 1, further comprising a sensor to detect a speed of the engine, wherein the clutch state of the alternator clutch is determined in real time based on the speed of the engine.

### Claim 6 (depends on 1)

The system of claim 1, further comprising a sensor to detect the speed of the alternator.

### Claim 7 (depends on 1)

The system of claim 1, wherein determining an amount of alternator torque further comprises:

### Claim 8

estimating an alternator rotor speed when the engine revolutions per minute decreases.

### Claim 9 (depends on 7)

The system of claim 7, wherein the alternator rotor speed is estimated by assuming that the engine is decoupled from the alternator.

### Claim 10 (depends on 1)

The system of claim 1, wherein the alternator torque value is based at least in part on an alternator inertia.

### Claim 11

A method of updating an engine torque load for a vehicle, said method comprising:
determining by a sensor a clutch state of an alternator clutch;
determining by an engine control unit an alternator torque value; and
applying by an engine control unit the alternator torque value to the engine torque load when it is determined that the clutch state corresponds to an alternator clutch engaged state.

### Claim 12 (depends on 10)

The method of claim 10, further comprising determining that an alternator load is disengaged from the engine when an alternator rotor speed is greater than an engine rotation speed.

### Claim 13 (depends on 10)

The method of claim 10, further comprising detecting a speed of the engine, wherein the clutch state of the alternator clutch is determined in real time based on the speed of the engine.

### Claim 14 (depends on 10)

The method of claim 10, further comprising detecting the speed of the alternator.

### Claim 15 (depends on 13)

The method of claim 13, wherein determining an amount of alternator torque comprises:
estimating an alternator rotor speed when the engine revolutions per minute decreases.

### Claim 16 (depends on 14)

The method of claim 14, wherein the alternator rotor speed is estimated by assuming that the engine is decoupled from the alternator.

### Claim 17 (depends on 10)

The method of claim 10, wherein the alternator torque value is based at least in part on an alternator inertia.