Back to results
US 8,708,428 B2Granted
Pump control apparatus and brake control system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorMasakuni Suzuki
Life of this patent
Estimating the term…
Abstract
In a pump control apparatus that controls the discharge of brake fluid using the rotation of a motor, the number of windings in a low speed circuit is set such that the motor operates at a second rotation speed when the low speed circuit is connected to a power supply. A high speed circuit shares a portion of the windings of the low speed circuit so that the motor operates at a first rotation speed when a power supply voltage is supplied to an input terminal which is disposed midway in the windings of the low speed circuit. An ECU determines the load state of the motor based on a difference between the output voltage at an output terminal and the power supply voltage.
Claims15
A pump control apparatus which controls discharge of brake fluid using rotation of a motor comprising:
- a motor main body including a rotating shaft that drives a pump;
- a high speed circuit configured to operate the motor at a first rotation speed when the high speed circuit is connected to a power supply;
- a low speed circuit configured to operate the motor at a second rotation speed which is slower than the first rotation speed when the low speed circuit is connected to the power supply while a voltage in the low speed circuit becomes higher than a power supply voltage when the power supply is connected to the high speed circuit;
- a switch connected between the power supply and the high speed circuit, and connected between the power supply and the low speed circuit;
- an output terminal which is connected to a first branch point via a first resistor, the first branch point being disposed in the low speed circuit between the motor main body and the switch, and which is connected to a second branch point via a second resistor, the second branch point being disposed in the high speed circuit between the motor main body and the switch;
- a temperature sensor that detects a temperature of the motor;
- and
- a controller determines a load state of the motor based on a first output voltage at the output terminal, and, if a first discharge state of the pump is normal, the controller determines a corrected first output voltage based on the first output voltage at the terminal and the temperature of the motor detected by the temperature sensor, and determines the load state of the motor based on the corrected first output voltage,
- wherein a value of the first resistor arranged between the output terminal and the low speed circuit is lower than a value of the second resistor arranged between the output terminal and the high speed circuit.
6 more elements
A brake control system comprising:
- a reservoir that stores brake fluid;
- a manual hydraulic pressure source that pressurizes the stored brake fluid according to an operating amount of a brake operating member by a driver;
- a power hydraulic pressure source that accumulates pressure using power independent of a brake operation by the driver;
- a first wheel cylinder which receives brake fluid from at least one of the manual hydraulic pressure source and the power hydraulic pressure source, and applies braking force to a first wheel;
- a second wheel cylinder which receives brake fluid from the power hydraulic pressure source, and applies braking force to a second wheel;
- a manual pressure transmitting path which connects the manual hydraulic pressure source with the first wheel cylinder such that the brake fluid is supplied from the manual hydraulic pressure source to the first wheel cylinder;
- a power hydraulic pressure transmitting path which connects the power hydraulic pressure source with the first wheel cylinder and the second wheel cylinder such that the brake fluid is supplied from the power hydraulic pressure source to the first wheel cylinder and the second wheel cylinder;
- a first control valve which is provided in the power hydraulic pressure transmitting path, and controls the supply of brake fluid from the power hydraulic pressure source to the first wheel cylinder;
- a second control valve which is provided in the power hydraulic pressure transmitting path, and controls the supply of brake fluid from the power hydraulic pressure source to the second wheel cylinder;
- and
- a valve controller that controls the first control valve and the second control valve to control the pressure of the brake fluid in the power hydraulic pressure transmitting path,
- wherein the power hydraulic pressure source includes a pump that is driven by a motor, an accumulator in which pressure is accumulated by filler gas being compressed by the brake fluid supplied from the pump, and a pump control apparatus that controls discharge of brake fluid using rotation of the motor;
- the pump control apparatus includes:
- a motor main body including a rotating shaft that drives the pump,
- a high speed circuit configured to operate the motor at a first rotation speed when the high speed circuit is connected to a power supply,
- a low speed circuit configured to operate the motor at a second rotation speed which is slower than the first rotation speed when the low speed circuit is connected to the power supply while a voltage in the low speed circuit becomes higher than a power supply voltage when the power supply is connected to the high speed circuit,
- a switch connected between the power supply and the high speed circuit, and connected between the power supply and the low speed circuit,
- an output terminal which is connected to a first branch point via a first resistor, the first branch point being disposed in the low speed circuit between the motor main body and the switch, and the first branch point is connected to a second branch point via a second resistor, the second branch point being disposed in the high speed circuit between the motor main body and the switch,
- a temperature sensor that detects a temperature of the motor, and
- a controller determines a load state of the motor based on a first output voltage at the output terminal, and, if a first discharge state of the pump is normal, the controller determines a corrected first output voltage based on the first output voltage at the terminal and the temperature of the motor detected by the temperature sensor, and determines the load state of the motor based on the corrected first output voltage, and
- the controller estimates a remaining amount of brake fluid between the reservoir and the pump from the load state of the motor.
18 more elements
A pump control apparatus which controls discharge of brake fluid using rotation of a motor comprising:
- a motor main body including a rotating shaft that drives a pump;
- a high speed circuit configured to operate the motor at a first rotation speed when the high speed circuit is connected to a power supply;
- a low speed circuit configured to operate the motor at a second rotation speed which is slower than the first rotation speed when the low speed circuit is connected to the power supply while a voltage in the low speed circuit becomes higher than a power supply voltage when the power supply is connected to the high speed circuit;
- a switch connected between the power supply and the high speed circuit, and connected between the power supply circuit and the low speed circuit;
- an output terminal which is connected to a first branch point via a first resistor, the first branch point being disposed in the low speed circuit between the motor main body and the switch, and which is connected to a second branch point via a second resistor, the second branch point being disposed in the high speed circuit between the motor main body and the switch, a value of the first resistor arranged between the output terminal and the low speed circuit is lower than a value of the second resistor arranged between the output terminal and the high speed circuit;
- and
- a controller that determines a load state of the motor based on an output voltage at the output terminal.
4 more elements
A brake control system comprising:
- a reservoir that stores brake fluid;
- a manual hydraulic pressure source that pressurizes the stored brake fluid according to an operating amount of a brake operating member by a driver;
- a power hydraulic pressure source that accumulates pressure using power independent of a brake operation by the driver;
- a first wheel cylinder which receives brake fluid from at least one of the manual hydraulic pressure source and the power hydraulic pressure source, and applies braking force to a first wheel;
- a second wheel cylinder which receives brake fluid from the power hydraulic pressure source, and applies braking force to a second wheel;
- a manual pressure transmitting path which connects the manual hydraulic pressure source with the first wheel cylinder such that the brake fluid is supplied from the manual hydraulic pressure source to the first wheel cylinder;
- a power hydraulic pressure transmitting path which connects the power hydraulic pressure source with the first wheel cylinder and the second wheel cylinder such that the brake fluid is supplied from the power hydraulic pressure source to the first wheel cylinder and the second wheel cylinder;
- a first control valve which is provided in the power hydraulic pressure transmitting path, and controls the supply of brake fluid from the power hydraulic pressure source to the first wheel cylinder;
- a second control valve which is provided in the power hydraulic pressure transmitting path, and controls the supply of brake fluid from the power hydraulic pressure source to the second wheel cylinder;
- and
- a valve controller that controls the first control valve and the second control valve to control the pressure of the brake fluid in the power hydraulic pressure transmitting path,
- wherein the power hydraulic pressure source includes a pump that is driven by a motor, an accumulator in which pressure is accumulated by filler gas being compressed by the brake fluid supplied from the pump, and a pump control apparatus that controls discharge of brake fluid using rotation of the motor;
- the pump control apparatus includes:
- a motor main body including a rotating shaft that drives the pump,
- a high speed circuit configured to operate the motor at a first rotation speed when the high speed circuit is connected to a power supply,
- a low speed circuit configured to operate the motor at a second rotation speed which is slower than the first rotation speed when the low speed circuit is connected to the power supply while a voltage in the low speed circuit becomes higher than a power supply voltage when the power supply is connected to the high speed circuit,
- a switch connected between the power supply and the high speed circuit, and connected between the power supply circuit and the low speed circuit,
- an output terminal which is connected to a first branch point via a first resistor, the first branch point being disposed in the low speed circuit between the motor main body and the switch, and the first branch point is connected to a second branch point via a second resistor, the second branch point being disposed in the high speed circuit between the motor main body and the switch, a value of the first resistor arranged between the output terminal and the low speed circuit is lower than a value of the second resistor arranged between the output terminal and the high speed circuit, and
- a controller that determines a load state of the motor based on an output voltage at the output terminal, and
- the controller estimates a remaining amount of brake fluid between the reservoir and the pump from the load state of the motor.
17 more elements
Dependencies are inferred from the claim text.