System and method for predicting negative pressure of brake booster of vehicle

Patent metadata

Field	Value
Publication number	US-12157449-B2
Application number	US-202318509028-A
Country	US
Kind code	B2
Filing date	Nov 14, 2023
Priority date	Dec 30, 2019
Publication date	Dec 3, 2024
Grant date	Dec 3, 2024

Abstract

A system for predicting a negative pressure of a brake booster of a vehicle includes: a driving information detector detecting driving information related to driving of the vehicle; and a controller determining a negative pressure of an intake manifold based on a pressure of the intake manifold and an atmospheric pressure which is the driving information and including a booster negative pressure predictor predicting the negative pressure of the brake booster by integrating over time a change rate according to a charging rate and a discharging rate of the negative pressure determined using a negative pressure of the brake booster determined in a previous cycle according to a logic for predicting the negative pressure of the brake booster and the negative pressure of the intake manifold of a current cycle and an imitated brake pedal force signal of the current cycle imitating an acceleration of the vehicle.

First claim

What is claimed is:

1. A system for predicting a negative pressure of a brake booster of a vehicle, the system comprising:
a driving information detector configured to detect driving information related to the vehicle according to driving of the vehicle; and
a controller operatively connected to the driving information detector and configured to determine a negative pressure of an intake manifold according to a pressure of the intake manifold and the driving information including an atmospheric pressure,
wherein the controller includes a booster negative pressure predictor configured to predict the negative pressure of the brake booster by integrating over time a change rate according to a charging rate and a discharging rate of the negative pressure of the brake booster determined using a negative pressure of the brake booster determined in a previous cycle according to a logic for predicting the negative pressure of the brake booster and the negative pressure of the intake manifold of a current cycle and an imitated brake pedal force signal of the current cycle imitating an acceleration of the vehicle,
wherein the controller is configured to control an operation of an air conditioner according to the predicted negative pressure of the brake booster, and
wherein the booster negative pressure predictor includes:
a charging model module configured to determine a first differential pressure over time using the negative pressure of the brake booster determined in the previous cycle and the negative pressure of the intake manifold of the current cycle;
a discharging model module configured to take a difference between the negative pressure of the brake booster determined in the previous cycle and the negative pressure of the intake manifold of the current cycle as a basic factor, and to compensate for the basic factor using the imitated brake pedal force signal to determine a second differential pressure over time;
a summing module configured to determine the change rate by adding a discharging rate of the negative pressure of the brake booster corresponding to the second differential pressure to the charging rate of the negative pressure of the brake booster corresponding to the first differential pressure; and
an integration module configured to integrate the change rate over time and to output the predicted negative pressure of the brake booster.

2. The system of claim 1 , wherein the controller is further configured to generate an acceleration inflection recognition signal by crossing the imitated brake pedal force signal over time and a reference line which is a zero crossing.

3. The system of claim 2 , wherein the controller is further configured to correct the charging rate and the discharging rate according to the acceleration inflection recognition signal.

4. The system of claim 1 , wherein in response that the predicted negative pressure of the brake booster is less than or equal to a reference negative pressure of a control for stopping the operation of the air conditioner of the vehicle, the controller is further configured to stop the operation of the air conditioner.

5. The system of claim 1 , wherein the driving information detector is further configured to detect the driving information from at least one of a vehicle speed sensor, a vehicle acceleration sensor, a gear stage sensor, an accelerator pedal sensor, a brake pedal operation sensor, a timer, and an atmospheric pressure sensor.

6. The system of claim 1 , wherein the booster negative pressure predictor is further configured to collect the negative pressure of the intake manifold and the driving information and to generate the negative pressure of the brake booster predicted in a cycle of a time period.

7. The system of claim 1 , wherein the charging rate of the negative pressure of the brake booster according to the first differential pressure is output as a positive value, and the discharging rate of the negative pressure of the brake booster according to the second differential pressure is output as a negative value.

8. The system of claim 1 , wherein the charging model module is further configured to determine the charging rate using a control map using the first differential pressure as an input value thereof.

9. The system of claim 1 , wherein the discharging model module is further configured to determine a multiplication factor for correcting the discharging rate using a correction map using a displacement change amount of the imitated brake pedal force as an input value thereof.

10. The system of claim 9 wherein the discharging model module is further configured to use an additional correction amount according to a repetition frequency of a zero crossing generated upon determining that repeated braking due to an on state and an off state of a brake operation signal continuously occurs to increase the discharging rate.

11. The system of claim 10 , wherein the discharging model module is further configured to use an additional correction amount to increase the discharging rate upon determining that the discharging model module continuously detects that the acceleration of the vehicle or a speed of the vehicle has an amplitude greater than or equal to a reference amplitude.

12. The system of claim 1 , wherein the integration module is further configured to feedback the predicted negative pressure of the brake booster to the charging model module and the discharging model module so that the predicted negative pressure is used to determine a charging rate and a discharging rate of a next cycle generated after the current cycle.

13. A system for predicting a negative pressure of a brake booster of a vehicle, the system comprising:
a driving information detector configured to detect driving information related to the vehicle according to driving of the vehicle; and
a controller operatively connected to the driving information detector and configured to determine a negative pressure of an intake manifold according to a pressure of the intake manifold and the driving information including an atmospheric pressure,
wherein the controller is configured to predict the negative pressure of the brake booster by integrating over time a change rate according to a charging rate and a discharging rate of the negative pressure of the brake booster determined using a negative pressure of the brake booster determined in a previous cycle according to a logic for predicting the negative pressure of the brake booster and the negative pressure of the intake manifold of a current cycle and an imitated brake pedal force signal of the current cycle imitating an acceleration of the vehicle and to control an operation of an air conditioner according to the predicted negative pressure of the brake booster, and
wherein the controller is further configured:
to determine a first differential pressure over time using the negative pressure of the brake booster determined in the previous cycle and the negative pressure of the intake manifold of the current cycle;
to take the first differential pressure as a basic factor, and to compensate for the basic factor using the imitated brake pedal force signal to determine a second differential pressure over time; and
to determine the predicted negative pressure of the brake booster using the first differential pressure and the second differential pressure.

14. The system of claim 13 , wherein the controller is further configured to generate an acceleration inflection recognition signal by crossing the imitated brake pedal force signal over time and a reference line which is a zero crossing.

15. The system of claim 13 , wherein i

Assignees

• Hyundai Motor Co Ltd
• Kia Corp
• Hyundai Kefico Corp

Inventors

• Jung Tae Hun
• Park Hyun Sung
• Kim Young-Jin

Classifications

• G05B13/048

  using a predictor · CPC title

• B60T2220/04

  Pedal travel sensor, stroke sensor; Sensing brake request · CPC title

• B60T2210/30

  Environment conditions or position therewithin · CPC title

• B60T2250/00

  Monitoring, detecting, estimating vehicle conditions · CPC title

• B60T2270/413

  Plausibility monitoring, cross check, redundancy · CPC title