# US 12,005,884 B2 · Method for optimising the time gradient of the pressure increase in an injection system of a hybrid motor vehicle

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- Number: US 12,005,884 B2
- Document ID: US12005884B2
- Status: Granted
- Kind: B2
- Application number: 17/640,757
- Filed: 2020-11-09
- Published: 2022-11-17
- Granted: 2024-06-11
- Earliest claimed: 2019-11-14
- Assignees: Vitesco Technologies GmbH
- Applicants: VITESCO TECHNOLOGIES GmbH
- Inventors: Nicolas Girard; Fabien Constans
- Web page: https://patentgrep.com/patent/US12005884B2

## CPC

- B60W 20/19: for achieving enhanced acceleration
- F02D 41/3845: {by controlling the flow into the common rail, e.g. the amount of fuel pumped}
- B60K 6/26: characterised by the motors or the generators
- B60K 6/485: Motor-assist type
- B60W 10/06: including control of combustion engines
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- F02D 29/02: peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
- F02D 41/10: for acceleration
- B60K 2006/268: {Electric drive motor starts the engine, i.e. used as starter motor}
- B60W 30/1882: {characterised by the working point of the engine, e.g. by using engine output chart}
- B60W 2510/0614: Position of fuel or air injector
- B60W 2510/0623: Fuel flow rate
- B60W 2510/0657: Engine torque
- B60W 2530/13: Mileage
- B60W 2710/0627: Fuel flow rate
- B60W 2710/083: Torque
- F02D 41/045: {Detection of accelerating or decelerating state (detection thereof in general G01P)}
- F02D 41/3836: {Controlling the fuel pressure}
- F02D 2041/389: {for injecting directly into the cylinder}
- F02D 2200/0602: Fuel pressure
- F02D 2200/0606: Fuel temperature
- F02D 2200/1002: Output torque
- F02D 2250/18: Control of the engine output torque
- F02D 2250/31: Control of the fuel pressure
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- F02D: CONTROLLING COMBUSTION ENGINES (vehicle fittings, acting on a single sub-unit only, for automatically controlling vehicle speed B60K31/00; conjoint control of vehicle sub-units of different type or different function, road vehicle drive control systems for purposes other than the control of a single sub-unit B60W)
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES

## Abstract

Disclosed is a method for optimizing the time gradient of the pressure increase in a fuel injection system of a hybrid motor vehicle. The method determines and uses the engine torque generated by the electric machine of the vehicle to reduce the engine torque generated by the internal combustion engine of the vehicle and allow the high-pressure pump of the internal combustion engine to generate, if applicable, a higher value of the time gradient of the pressure increase in the common supply chamber of its injection system.

## Claims

### Claim 1

A method for optimizing a pressure increase time gradient in a fuel injection system of a hybrid motor vehicle, said hybrid motor vehicle comprising an internal combustion engine and an electric machine, each suitable for generating a predetermined engine torque, said internal combustion engine comprising an injection system with a high-pressure pump, a supply circuit, a common chamber for supplying pressurized fuel and a plurality of injectors supplied with the pressurized fuel in the common chamber,
said method comprising the following steps, executed by a control unit of the hybrid motor vehicle in response to a first time gradient setpoint of the pressure increase of the fuel in the common fuel supply chamber representative of a predetermined acceleration request of the hybrid motor vehicle:
a) comparing the first time gradient setpoint with a predetermined threshold value (THD) corresponding to a theoretical maximum capability to generate a pressure increase time gradient by action of the internal combustion engine on the high-pressure pump;
and, if the first time gradient setpoint is greater than the predetermined threshold value;
b) determining an additional engine torque value to be generated by the electric machine to allow the high-pressure pump to generate a pressure increase time gradient according to the first time gradient setpoint by action of the internal combustion engine on the high-pressure pump;
c) determining a first engine torque setpoint, for controlling the electric machine, on the basis of a maximum engine torque value that said electric machine can produce and the additional engine torque value;
d) transmitting an engine torque request to a control unit of the electric machine on the basis of the first engine torque setpoint;
e) determining a second engine torque setpoint, for controlling the internal combustion engine, on the basis of the required engine torque associated with the predetermined acceleration command, and the first engine torque setpoint;
f) determining combustion parameters suitable for causing the generation of engine torque by the internal combustion engine on the basis of the second engine torque setpoint;
g) determining an available pressure increase time gradient value associated with the second engine torque setpoint; and
h) determining a second pressure increase time gradient setpoint on the basis of the available pressure increase time gradient value, a maximum theoretical pressure increase time gradient value, and the first pressure increase time gradient setpoint.

### Claim 2 (depends on 1)

The method as claimed in claim 1, in which the internal combustion engine of the hybrid motor vehicle is a diesel engine.

### Claim 3 (depends on 2)

The method as claimed in claim 2, in which the hybrid motor vehicle uses a P0 architecture.

### Claim 4 (depends on 2)

The method as claimed in claim 2, in which the predetermined threshold value (THD) corresponding to the theoretical maximum capability to generate a pressure increase time gradient using the high-pressure pump is a function of operating parameters of the injection system.

### Claim 5 (depends on 2)

The method as claimed in claim 2, in which the first engine torque setpoint, determined in step c), is equal to the minimum of the maximum engine torque value that the electric machine can produce and the additional engine torque.

### Claim 6 (depends on 1)

The method as claimed in claim 1, in which the hybrid motor vehicle uses a P0 architecture.

### Claim 7 (depends on 6)

The method as claimed in claim 6, in which the electric machine has a mild hybrid 48V configuration.

### Claim 8 (depends on 7)

The method as claimed in claim 7, in which the predetermined threshold value (THD) corresponding to the theoretical maximum capability to generate a pressure increase time gradient using the high-pressure pump is a function of operating parameters of the injection system.

### Claim 9 (depends on 7)

The method as claimed in claim 7, in which the first engine torque setpoint, determined in step c), is equal to the minimum of the maximum engine torque value that the electric machine can produce and the additional engine torque.

### Claim 10 (depends on 6)

The method as claimed in claim 6, in which the predetermined threshold value (THD) corresponding to the theoretical maximum capability to generate a pressure increase time gradient using the high-pressure pump is a function of operating parameters of the injection system.

### Claim 11 (depends on 6)

The method as claimed in claim 6, in which the first engine torque setpoint, determined in step c), is equal to the minimum of the maximum engine torque value that the electric machine can produce and the additional engine torque.

### Claim 12 (depends on 1)

The method as claimed in claim 1, in which the predetermined threshold value (THD) corresponding to the theoretical maximum capability to generate a pressure increase time gradient using the high-pressure pump is a function of operating parameters of the injection system.

### Claim 13 (depends on 12)

The method of claim 12, wherein the operating parameters of the injection system comprise fuel temperature in the injection system.

### Claim 14 (depends on 13)

The method of claim 13, wherein the operating parameters of the injection system further comprise the hybrid motor vehicle mileage since the high-pressure pump was installed.

### Claim 15 (depends on 12)

The method as claimed in claim 12, in which the first engine torque setpoint, determined in step c), is equal to the minimum of the maximum engine torque value that the electric machine can produce and the additional engine torque.

### Claim 16 (depends on 1)

The method as claimed in claim 1, in which the first engine torque setpoint, determined in step c), is equal to the minimum of the maximum engine torque value that the electric machine can produce and the additional engine torque.

### Claim 17 (depends on 1)

The method as claimed in claim 1, in which the second engine torque setpoint, determined in step e), is equal to the difference between the required engine torque value associated with the predetermined acceleration command and the first engine torque setpoint.

### Claim 18 (depends on 1)

The method as claimed in claim 1, in which the second pressure increase time gradient setpoint, determined in step h), is equal to the minimum of the available pressure increase time gradient value, the maximum theoretical pressure increase time gradient value and the first pressure increase time gradient setpoint.

### Claim 19 (depends on 1)

A computer for managing an engine of a hybrid motor vehicle comprising suitable means for executing all of the steps of the method as claimed in claim 1.

### Claim 20 (depends on 1)

A system for optimizing the pressure increases time gradient in the fuel injection system of the hybrid motor vehicle comprising suitable means for executing all of the steps of the method as claimed in claim 1.