Method for testing a pressure-medium-operated electronic brake system

Patent metadata

Field	Value
Publication number	US-11565681-B2
Application number	US-201916674331-A
Country	US
Kind code	B2
Filing date	Nov 5, 2019
Priority date	Nov 7, 2018
Publication date	Jan 31, 2023
Grant date	Jan 31, 2023

Abstract

A method for testing a pressure-medium-operated electronic brake system of a vehicle having a valve and sensor device including a control pressure inlet, a control pressure outlet, a plurality of valves selected from electrically activated inlet valves, outlet valves, redundancy valves, and pressure valves, an actual pressure sensor for measuring an actual control pressure, a setpoint pressure sensor for measuring a setpoint control pressure, and an electronic control unit, which has a signal-conducting connection to the electrically activated valves and pressure sensors, for receiving pressure signals and actuating the electrically activated valves, includes testing the setpoint pressure sensor while the control unit is in a passive operating mode, passing the setpoint control pressure directly through to the control pressure outlet, measuring the actual pressure at the control pressure outlet using a sensor, and transmitting the measured value to the control unit for plausibility checking against the setpoint pressure measurement.

First claim

The invention claimed is:

1. A method for functionally testing a pressure-medium-operated electronic brake system of a vehicle with a valve and sensor device having:
at least one control pressure inlet and at least one control pressure outlet;
a plurality of valves selected from electrically activated inlet valves, outlet valves, redundancy valves, and pressure valves;
an at least one actual pressure sensor configured to measure an actual control pressure and transmit an actual control pressure signal;
an at least one setpoint pressure sensor configured to measure a setpoint control pressure and transmit a setpoint control pressure signal;
an electronic control unit configured to receive pressure signals and to actuate the plurality of valves, the electronic control unit having a signal-conducting connection to:
the electrically activated valves;
the at least one actual pressure sensor; and
the at least one setpoint pressure sensor;

wherein:
the valve and sensor device has a normal operating mode in which the electronic control unit is configured to actively regulate the actual control pressure at the control pressure outlet via the setpoint control pressure;
the valve and sensor device has a redundancy mode in which the electronic control unit is in a passive operating mode wherein the actual control pressure present at the control pressure outlet is generated directly by the setpoint control pressure present at the control pressure inlet;

the method comprising:
switching the valve and sensor device into the redundancy mode;
measuring the setpoint control pressure provided at the control pressure inlet of the valve and sensor device via the setpoint pressure sensor;
transmitting the setpoint control pressure as an input signal to the electronic control unit,
measuring the actual control pressure provided at the control pressure outlet;
transmitting the actual control pressure as an input signal to the electronic control unit;
performing a comparative plausibility check of the actual control pressure and the setpoint control pressure via the electronic control unit;
detecting a malfunction of the setpoint pressure sensor via a result of the comparative plausibility check; and
storing or outputting a fault message.

2. The method of claim 1 , wherein switching the valve and sensor device into the redundancy mode is carried out when the vehicle is in a predetermined specific operating state.

3. The method of claim 2 , wherein the predetermined specific operating state is a “vehicle stationary state” operating state or a “first braking process after starting” operating state.

4. The method of claim 2 , comprising determining the predetermined specific operating state using an operational parameter of the vehicle, wherein the operational parameter is provided by a bus system of the vehicle.

5. The method of claim 4 , wherein the operational parameter of the vehicle is selected from a speed of the vehicle, a wheel speed of the vehicle, a longitudinal acceleration of the vehicle, and an operating state of an immobilizing brake.

6. The method of claim 1 , wherein the method is carried out on a valve and sensor device configured to actuate a service brake system of the vehicle.

7. The method of claim 1 , wherein the method is carried out on a valve and sensor device configured to actuate an immobilizing brake system of the vehicle.

8. The method of claim 1 , wherein the method is carried out on an electronic trailer control valve configured to actuate a trailer brake system of a trailer vehicle, wherein the pressure control inlet is a redundancy pressure inlet and the control pressure outlet is connected to a control pressure coupling head configured to couple a brake line of the trailer vehicle to the control pressure outlet.

9. A utility vehicle selected from a single vehicle or a tractor vehicle-trailer vehicle combination having an electronic brake system with a valve and sensor device configured to be compatible with the method of claim 1 .

10. A method for functionally testing a pressure-medium-operated electronic brake system of a vehicle, the brake system having:
a valve and sensor device comprising:
at least one pneumatic control pressure inlet and at least one pneumatic control pressure outlet;
a plurality of valves selected from electrically activated inlet valves, outlet valves, redundancy valves, and pressure valves;
an at least one actual pneumatic pressure sensor within the valve and sensor device configured to measure an actual pneumatic control pressure present at the at least one pneumatic control pressure outlet and to transmit an actual control pressure signal;

an electronic control unit configured to receive pressure signals and to actuate the plurality of valves of the valve and sensor device,
an at least one setpoint pressure sensor configured to measure a pneumatic setpoint control pressure in a pressure line connected to the at least one pneumatic control pressure inlet of the valve and sensor device and to transmit a setpoint control pressure signal to the electronic control unit;
wherein the electronic control unit has a signal-conducting connection to:
the electrically activated valves of the valve and sensor device;
the at least one actual pneumatic pressure sensor of the valve and sensor device; and
the at least one pneumatic setpoint pressure sensor;

wherein:
the valve and sensor device has a normal operating mode in which the electronic control unit is configured to actively regulate the actual pneumatic control pressure at the pneumatic control pressure outlet via the pneumatic setpoint control pressure;
the valve and sensor device has a redundancy mode in which the electronic control unit is in a passive operating mode wherein the actual pneumatic control pressure present at the pneumatic control pressure outlet is generated directly by the pneumatic setpoint control pressure present at the pneumatic control pressure inlet;

the method comprising:
switching the valve and sensor device into the redundancy mode;
measuring the pneumatic setpoint control pressure provided at the pneumatic control pressure inlet of the valve and sensor device via the pneumatic setpoint pressure sensor;
transmitting the pneumatic setpoint control pressure as an input signal to the electronic control unit,
measuring the actual pneumatic control pressure provided at the pneumatic control pressure outlet;
transmitting the actual pneumatic control pressure as an input signal to the electronic control unit;
performing a comparative plausibility check of the actual pneumatic control pressure and the setpoint pneumatic control pressure via the electronic control unit;
detecting a malfunction of the pneumatic setpoint pressure sensor via a result of the comparative plausibility check; and
storing or outputting a fault message.

11. A method for functionally testing a pressure-medium-operated electronic brake system of a vehicle with a valve and sensor device having:
at least one control pressure inlet and at least one control pressure outlet;
a plurality of valves selected from electrically activated inlet valves, outlet valves, redundancy valves, and pressure valves;
an at least one actual pressure sensor configured to measure an actual control pressure at the at least one control pressure outlet and to transmit an actual control pressure signal;
an at least one setpoint pressure sensor configured to measure a setpoint control pressure and transmit a setpoint control pressure signal;
an electronic control unit configured to receive pressure signals and to actuate the plurality of valves, the electronic control uni

Assignees

• Wabco Gmbh

Inventors

• Dombek Dominika
• Klostermann Thilo
• Löll Jann
• Schmidt Jakob Friedrich

Classifications

• B60T2250/04

  Vehicle reference speed; Vehicle body speed · CPC title

• B60T2270/413

  Plausibility monitoring, cross check, redundancy · CPC title

• B60T2240/00

  Monitoring, detecting wheel/tyre behaviour; counteracting thereof · CPC title

• B60T17/221 Primary

  Procedure or apparatus for checking or keeping in a correct functioning condition of brake systems (hydraulic pressure systems in general F15B19/00, F15B21/04; testing structures or apparatus G01M) · CPC title

• B60T2220/04

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