CN115092248A - Variable-frequency adjusting system and method for braking and steering shared oil pump - Google Patents
Variable-frequency adjusting system and method for braking and steering shared oil pump Download PDFInfo
- Publication number
- CN115092248A CN115092248A CN202210907774.7A CN202210907774A CN115092248A CN 115092248 A CN115092248 A CN 115092248A CN 202210907774 A CN202210907774 A CN 202210907774A CN 115092248 A CN115092248 A CN 115092248A
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- oil
- steering
- oil pump
- brake
- energy accumulator
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
- B62D5/064—Pump driven independently from vehicle engine, e.g. electric driven pump
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/12—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid
- B60T13/16—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs
- B60T13/20—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being liquid using pumps directly, i.e. without interposition of accumulators or reservoirs with control of pump driving means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
- B62D5/062—Details, component parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- General Engineering & Computer Science (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses a variable-frequency adjusting system and an adjusting method of a brake steering shared oil pump, and the variable-frequency adjusting system comprises an oil storage cup, a hydraulic booster with a brake master cylinder assembly, a brake assembly with an ABS (anti-lock brake system), a brake pedal, a steering oil tank, a power steering gear and a steering oil pump, wherein the hydraulic booster with the brake master cylinder assembly comprises a brake oil way, a steering oil way and an energy accumulator; an oil inlet of the oil storage cup is connected with a brake oil way, an oil outlet of the oil storage cup is connected with a brake oil way, and a brake pedal, the brake oil way, a brake assembly belt ABS and front and rear axle left and right brake slave pumps are sequentially connected; the steering oil way is connected with the steering oil tank; the power steering gear is connected with the steering wheel, and the braking and steering share the oil pump system, the braking and steering system and the control logic, so that the safety and energy conservation under different driving conditions are realized, and the rapidness, safety, high efficiency and energy conservation of the braking process are particularly ensured.
Description
Technical Field
The invention relates to the technical field of brake steering of pure electric vehicles, in particular to a brake steering common oil pump variable-frequency adjusting system and method for brake steering of the pure electric vehicles.
Background
For a light-truck electric vehicle with a high light-weight requirement, a strategy of braking and steering a common oil pump is generally adopted to realize strategy control of the steering and braking common oil pump of a light-truck vehicle, in this case, a DCAC controller of the oil pump is required to be used for controlling the braking and steering, a driver's driving intention is prejudged according to the state of the vehicle to a certain extent through the control of the DCAC controller of the oil pump, and the like to process certain parameters, and frequency conversion strategies for dealing with the oil pump under different possible working conditions are worked out. Therefore, the monitoring and judgment of some states of the vehicle under different working conditions can be considered, the certain states which can be possibly carried out by a driver are pre-judged and prepared according to the vehicle states, and certain judgment is carried out to a certain extent, so that the aims of energy conservation and safety are fulfilled on the basis of light system weight.
Pure electric generally adopts the mode that the oil pump is fixed frequently to carry out certain control to steering brake, and the oil pump work of always needing is at rated revolution, and the problem that brings like this is: the energy consumption is too high and is not necessary; if the braking steering can be pre-judged to a certain degree, the steering is not needed to be carried out aiming at different working conditions, such as high-speed driving; when the accelerator pedal works, braking is not needed, so that the consumption of electric energy to a great extent can be avoided.
In the prior art, the oil pump operates at a rated rotating speed for a long time due to the fixed-frequency operation of the oil pump, and the oil pump does not need to be guaranteed to operate at the rated rotating speed all the time, so that the loss of electric energy is not only caused. In addition, when the vehicle runs at a high speed, the steering pump always works at a rated rotating speed, and the high-speed steering is also a challenge to the running safety, so that a great safety problem is caused, and even the potential safety hazard can be caused.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a brake steering common oil pump variable-frequency type adjusting system. According to the invention, some states of the vehicle are monitored and judged under different working conditions, a certain state which is possibly carried out by a driver is pre-judged through the vehicle state, preparation is carried out, and a certain judgment is carried out to a certain extent, so that the purposes of energy saving and safety are realized on the basis of light system weight.
The invention further provides a frequency conversion type adjusting method of the braking and steering shared oil pump.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a frequency conversion type adjusting system of a braking and steering shared oil pump comprises an oil storage cup, a hydraulic booster belt braking master cylinder assembly, a braking assembly belt ABS, a braking pedal, a steering oil tank, a power steering gear, a steering oil pump, a power steering gear and a steering wheel, wherein the hydraulic booster belt braking master cylinder assembly is connected with the steering oil tank through the steering oil pump, and the hydraulic booster belt braking master cylinder assembly is connected with the steering oil tank through the power steering gear; the hydraulic booster with the master brake pump assembly comprises a brake oil way, a steering oil way and an energy accumulator, wherein the energy accumulator is connected with the brake oil way through an oil port on the brake side of the energy accumulator;
an oil inlet of the oil storage cup is connected with a brake oil way through a brake oil storage cup oil inlet pipeline, an oil outlet of the oil storage cup is connected with the brake oil way through a brake oil storage cup oil outlet pipeline, and a brake pedal is connected with the brake oil way;
the brake oil way is connected with a brake assembly belt ABS which is connected with left and right brake slave cylinders of the front and rear axles;
the steering oil way is connected with the steering oil tank through a steering oil pump; the steering oil way is connected with a steering oil tank through a power steering gear, and the power steering gear is connected with a steering wheel;
the steering oil pump, the pressure sensor, the energy accumulator steering side switch, the brake pedal and the accelerator pedal are electrically connected with the electric control device.
The oil pump DCAC controller adopts a variable frequency oil pump controller.
The brake oil way is respectively connected with an R interface and an F interface of a brake branch pump of a brake assembly with an ABS (anti-lock brake system) through a first high-pressure pipeline and a second high-pressure pipeline, the front and rear left and right brake branch pumps comprise a front-shaft right brake branch pump, a front-shaft left brake branch pump, a rear-shaft right brake branch pump and a rear-shaft left brake branch pump, and the ABS of the brake assembly with the ABS is respectively connected with the front-shaft right brake branch pump, the front-shaft left brake branch pump, the rear-shaft right brake branch pump and the rear-shaft left brake branch pump through a third high-pressure pipeline, a fourth high-pressure pipeline, a fifth high-pressure pipeline, a sixth high-pressure pipeline, a front-shaft right brake branch pump, a rear-shaft left brake branch pump and a rear-shaft left brake branch pump;
the steering oil pump is provided with an oil pump motor, the steering oil pump is connected with an oil inlet of a steering oil path through an oil inlet pipeline of a steering liquid assembly, the steering oil pump is connected with an oil outlet of a steering oil tank through an oil outlet pipeline of a steering gear, and the oil outlet of the steering oil path is connected with the oil inlet of the steering oil tank through a steering liquid return hose; an oil outlet of the steering oil path is connected with an oil inlet of the power steering gear through an oil outlet pipeline of the steering oil path, and an oil outlet of the power steering gear is connected with an oil inlet of the steering oil tank through an oil return pipeline of the oil through pipeline of the power steering gear.
The electric control device comprises a vehicle control unit VCU, a high-voltage distribution box PDU, an electric box system and a turning one-key starting button; the steering one-key starting button is arranged in the cab and is a self-reset button; the system comprises a brake pedal, an accelerator pedal, an oil pump DCAC controller, a pressure sensor and an energy accumulator steering side switch;
the steering one-key starting button, the brake pedal, the accelerator pedal, the pressure sensor and the energy accumulator steering side switch are respectively in low-voltage electric connection with the VCU of the vehicle control unit; the oil pump DCAC controller is connected with the vehicle control unit through a CAN (controller area network) line, the high-voltage distribution box PDU (Power distribution Unit) is in high-voltage direct-current electric connection with the oil pump DCAC controller, and the high-voltage distribution box PDU is in high-voltage direct-current electric connection with the electric box system; the oil pump motor is in high-voltage alternating current connection with the oil pump DCAC controller, and the oil pump DCAC controller controls the oil pump motor;
the high-voltage distribution box PDU is responsible for distributing power to the high-voltage oil pump DCAC controller;
the oil pump motor is responsible for supplying pressure to a steering and braking hydraulic circuit, the oil pump motor is arranged on a steering oil pump, the steering oil pump supplies pressure to a steering oil way in a main brake pump assembly of the hydraulic booster, pressure is built on the braking oil way through a thrust rod, pressure is supplied to the energy accumulator, and the energy accumulator simultaneously supplies pressure to the braking oil way;
the turning one-key starting button adopts a reset switch and is responsible for maintaining the 30S turning test capability after high-voltage power-on, and providing a choice for a driver;
the VCU is responsible for outputting oil pump enable, and requests the oil pump to need the rotational speed on the DCAC controller of the variable frequency oil pump;
the brake pedal is responsible for outputting a braking request;
the accelerator pedal is responsible for outputting an accelerator request;
the oil pump DCAC controller is responsible for controlling the oil pump to work normally;
the electric box system is responsible for supplying power to the whole system;
the pressure sensor is arranged at an oil port at the braking side of the energy accumulator and is responsible for feeding back the oil pressure at the braking side of the energy accumulator to the vehicle control unit;
the energy accumulator steering side switch is responsible for receiving a level signal of the VCU, when the VCU outputs a low level, the steering side switch is turned on, oil pressure is built at the moment, and when the VCU outputs a suspension signal, the energy accumulator steering side switch is turned off at the moment.
A variable-frequency type adjusting method for a brake steering common oil pump comprises the following conditions:
1) when the vehicle is powered on, the vehicle control unit sends out control logics for enabling the oil pump motor and requesting the rotating speed of the oil pump motor;
2) the vehicle control unit sends out the control logic of enabling the oil pump and requesting the motor speed by the oil pump when driving;
3) and under the two conditions of power on and driving, the oil pump requests the motor speed, and the energy accumulator is subjected to pressurization logic.
The case 1) includes:
when the vehicle starts, firstly, whether KEY ON is performed or not is judged, when the KEY ON is not performed, state keeping is performed, after the KEY ON, the vehicle control unit starts to be awakened, the vehicle control unit detects the pressure value of the energy accumulator, at the moment, the vehicle control unit judges whether a system, READY and RUN are performed or not, if the system, READY and RUN are not detected, at the moment, the vehicle control unit judges whether a switch for starting the oil pump by pressing a KEY is arranged by a driver or not after the READY and RUN are detected, when the switch is pressed, the vehicle control unit can turn a vehicle by one stroke, the steering capacity of the oil pump can be tested, at the moment, the vehicle control unit requests the oil pump to enable, and the oil pump enters a high-rotation speed request state, if the vehicle control unit judges that the pressure of the energy accumulator is insufficient, at the moment, the vehicle control unit requests the oil pump to rotate at a rotation speed, the rotation speed is from 0 rotation speed to a high rotation speed, the DCAC controller of the oil pump sets a proper time, so that the time for the oil pump to reach the high rotation speed is as short as possible, at the moment, the pressure filling time of the energy accumulator can be ensured to be as short as possible, so that the energy storage process is ensured, the impact vibration of an oil way is as small as possible, so that the comfort performance of a cab is ensured, and the VCU sends a low level to an oil port switch at the steering side of the energy accumulator, and the switch is opened to carry out pressurization;
the oil pump one-key starting button is a reset switch, and if the hand brake is not released within the delay time, the vehicle control unit requests the oil pump to enter a low-rotation-speed state; if the hand brake is released later or within 30s, judging the gear condition of the vehicle: neutral, forward, reverse; if the energy accumulator is not in neutral gear, firstly detecting the state of the energy accumulator, if the energy accumulator needs to be pressurized, then the vehicle control unit sends oil pump enable, the oil pump motor enters a high request rotating speed state, and the VCU sends low level to an oil port switch on the steering side of the energy accumulator, the switch is opened, the time from 0 rotating speed to high rotating speed is as short as possible, the pressurizing time of the energy accumulator is set as Ns, the Ns is the calibration quantity of time, the specific pressurizing time is the time value calculated and calibrated by combining specific vehicle types and matching, if the pressurization of the energy accumulator in Ns is completed and the vehicle speed does not reach 20km/h, at this moment, the default vehicle needs to turn, the high rotating speed request of the oil pump is still kept until the vehicle speed exceeds 20km/h, if the pressurization in Ns is completed, the vehicle speed exceeds 20km/h, at this moment, the VCU requests the low rotating speed to work, meanwhile, a suspension signal is sent to an oil port switch at the steering side of the energy accumulator, the switch is closed, and the pressure of the energy accumulator is maintained; if the vehicle speed exceeds 20km/h in Ns and the accumulator is not fully pressurized to the P1 state, the high-speed state of the oil pump is still maintained until the Ns accumulator is fully pressurized, and if the accumulator is still not fully pressurized in Ns, an accumulator pressurization failure is reported, and a driver needs to stop immediately.
The case 2) includes:
at this time, during the driving process, the hand brake state and the gear state of the vehicle are as follows: judging whether a manual brake signal is changed from 0 to 1 or a gear is changed and whether the manual brake signal is in a non-neutral gear or not, and judging the pressure of an energy accumulator by the vehicle control unit, wherein the aim is to prevent the energy accumulator from being rapidly released after the vehicle is completely braked to cause the situations of no supply and pressure compensation, if the driver starts quickly, the pressure exceeds 20Km/h in Ns and the pressure is not increased to P1, the oil pump still needs to enter a high-request rotating speed state, if the energy accumulator does not completely increase the pressure in Ns, the pressure increase fault of the energy accumulator can be reported, the driver needs to be immediately engaged in the neutral gear, and if the vehicle speed is more than 0 and less than 20Km/h, the vehicle control unit needs to send the oil pump to enable and needs to request the high rotating speed of the oil pump; when the vehicle speed is more than 20km/h, the vehicle control unit sends an oil pump enable and requests the oil pump to rotate at a low speed, which is a detection carried out in the process that an accelerator signal exists all the time, if the accelerator signal does not exist, the vehicle is judged to have the possibility of braking at the moment, the vehicle control unit continuously judges the pressure condition of an energy accumulator, if the pressure of the energy accumulator becomes low, an alarm needs to be given out at the moment, a driver is informed of stopping as soon as possible, the energy accumulator has the pressure leakage condition, if the pressure of the energy accumulator does not have a problem, the oil pump is requested to rotate at a high speed, if the accelerator pedal is not stepped, the vehicle control unit judges that the brake pedal is not stepped within 5s, the vehicle control unit continues to send the oil pump enable and requests the rotating speed in the oil pump to work; certainly, if a driver has stepped on the brake pedal within 5s, the brake is required to be carried out by the energy accumulator and the motor braking energy feedback before the oil pump oil pressure is not established, and then the brake is carried out by the oil pump oil pressure and the motor braking energy feedback, so that the smoothness of the braking process and the comfort of the brake pedal are ensured; after primary braking is finished, a braking signal is finished, the vehicle control unit detects whether the pressure of the energy accumulator is lower than a P value or not, if so, the VCU vehicle control unit requests the oil pump to work at a high rotating speed, and sends a low level to the oil port switch on the steering side of the energy accumulator, and the switch opens the energy accumulator to enter a pressurization flow to pressurize to the P1 value, and if not, the vehicle control unit sends oil pump enable and requests the rotating speed in the oil pump to work.
The case 3) includes:
when the voltage of a brake pedal is detected to be in a non-braking state, the vehicle control unit sends an oil pump enable and requests the oil pump to have high rotation speed, when the voltage of the brake pedal is detected to be in the non-braking state, the vehicle control unit judges the pressure of the energy accumulator and judges that the outlet pressure is smaller than a P value, if the energy accumulator does not need to be pressurized, the vehicle control unit keeps in an original state, if pressurization is needed, the vehicle control unit sends the oil pump enable at the moment, the oil pump enters a high-request rotation speed state, the VCU vehicle control unit sends a low level to a switch on a steering side of the energy accumulator, a switch is turned on, pressurization is carried out, the time from 0 rotation speed to high rotation speed is as short as possible, the pressurization time of the energy accumulator is set to be Ns, if pressurization of the energy accumulator in Ns is finished, the VCU sends a suspension signal to the switch on the steering side of the energy accumulator at the moment, and the switch is turned off, and pressure maintaining is carried out; if the accumulator is still not fully charged when the accumulator is at Ns, an accumulator charging failure is reported and the driver needs to stop immediately.
The invention has the beneficial effects that:
1. according to the invention, some states of the vehicle are monitored and judged under different working conditions, a certain state which is possibly carried out by a driver is pre-judged through the vehicle state, preparation is carried out, and a certain judgment is carried out to a certain extent, so that the purposes of energy saving and safety are realized on the basis of light system weight.
2. The invention discloses a variable-frequency type adjusting system of a brake steering shared oil pump, which is characterized in that an energy accumulator structure is additionally arranged on a hydraulic booster master cylinder assembly in the variable-frequency type adjusting system of the brake steering shared oil pump, a pressure sensor is required to be additionally arranged on a brake oil port in an energy accumulator, an energy accumulator steering side oil port switch is additionally arranged on an energy accumulator steering oil port to detect pressure, subsequent pressure control is facilitated, and the working requirement of the whole system can be reliably met.
3. By adopting the energy accumulator with the oil pressure detection device and the steering side oil port switch, the high pressure of the energy accumulator for braking can be ensured in the braking process and the driving process. When an oil pump motor rotates at a high rotating speed, oil pressure is fed from a steering oil pump to a steering oil circuit and an energy accumulator, the steering oil circuit supplies oil pressure to a brake oil circuit through a thrust rod, when the oil pressure of an oil port on the brake side of the energy accumulator reaches a pressure value P1 required to be calibrated, the oil port on the steering side is closed at the moment, a pressure maintaining process is carried out, the energy accumulator always ensures very high energy storage pressure in the driving process, can reliably support continuous and repeated emergency braking, and ensures the reliability and safety of braking, when an accelerator is released, the braking requirement can be judged to exist, at the moment, the hydraulic oil is braked, the process of supplying pressure from the oil pump to the steering oil circuit to the brake oil circuit through the thrust rod is carried out, enough braking oil pressure for braking is not established yet, when a brake pedal is stepped on, the oil pressure fed back to the side of the brake oil circuit through the thrust rod through the oil pump is not completely established, and the braking force distribution is established through the oil pressure of the braking energy accumulator together, when the oil pressure of a braking oil path (from an oil pump to a steering oil path to the side of the braking oil path through a thrust rod) is established, when the braking is continued and after the braking is completed, if the pressure of an oil outlet of the energy accumulator is detected to be lower than a pressure value P required to be calibrated, the pressure value P is a pressure threshold value of the oil pump DCAC requesting high-speed operation, P is a value calibrated according to the braking, the requirement is mainly met for 5 times of continuous braking under the maximum quality, the pressure value of the P value is detected and judged by the whole vehicle controller, and at the moment, the steering oil pump is in a high-pressure and high-speed process under the same requirement, so that the pressure recovery process of the energy accumulator is realized; the high pressure and the high rotating speed are required to be maintained until the energy accumulator is completely punched, so that the process of strong vibration cannot occur in the pressurization process of the energy accumulator, and the efficient, safe, comfortable and energy-saving braking process is further ensured.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of a variable-frequency type regulating system of a braking and steering shared oil pump of the invention;
FIG. 2 is a schematic diagram of an electrical control device of an embodiment of the variable-frequency type regulating system of the braking and steering shared oil pump;
FIG. 3 is a logic flow diagram of oil pump requested speed at power up;
FIG. 4 is a logic flow diagram of the requested rotational speed of the oil pump during driving;
FIG. 5 is a logic flow diagram of the accumulator pressurization during both power-up and drive conditions.
The hydraulic power steering system comprises an oil storage cup 1-1, a hydraulic booster with a master cylinder assembly 1-2, a brake assembly with an ABS1-3, a brake pedal 1-4, a steering oil tank 1-5, a power steering gear 1-6, a steering oil pump 1-7 and a steering wheel 1-8; 1-9 parts of brake oil path, 1-10 parts of steering oil path, 1-11 parts of energy accumulator, 1-12 parts of pressure sensor, 1-13 parts of oil port on steering side of energy accumulator, 1-14 parts of oil port on braking side of energy accumulator, 1-15 parts of thrust rod, 1-16 parts of oil outlet pipeline of steering device, 1-17 parts of oil inlet pipeline of steering fluid assembly, 1-18 parts of oil outlet pipeline of steering oil path, 1-19 parts of oil return pipeline of power steering device, 1-20 parts of oil return hose of steering fluid, 1-21 parts of oil inlet pipeline of brake oil storage cup, 1-22 parts of oil outlet pipeline of brake oil storage cup, 1-23 parts of first part of high pressure pipeline, 1-24 parts of second part of high pressure pipeline, 1-25 parts of third part of high pressure pipeline, 1-26 parts of fourth part of high pressure pipeline, 1-27 parts of fifth part of high pressure pipeline, 1-28 parts of high pressure pipeline, and 1-29 parts of right brake sub-pump of front axle, the brake system comprises 1-30 parts of a front axle left brake cylinder, 1-31 parts of a rear axle right brake cylinder, 1-32 parts of a rear axle left brake cylinder, 1-33 parts of an oil port switch on a steering side of an energy accumulator, 2-1 parts of a high-voltage distribution box PDU, 2-2 parts of an oil pump motor, 2-3 parts of a steering one-key opening button, 2-4 parts of a vehicle control unit VCU, 1-4 parts of a brake pedal, 2-6 parts of an accelerator pedal, 2-7 parts of an oil pump DCAC controller, 2-8 parts of an electric box system, 1-12 parts of a pressure sensor and 1-33 parts of an energy accumulator steering side switch.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments.
Referring to fig. 1-5, a variable-frequency regulation system of a braking and steering shared oil pump comprises an oil storage cup (1-1), a hydraulic booster with a braking master cylinder assembly (1-2), a braking assembly with an ABS (1-3), a braking pedal (1-4), a steering oil tank (1-5), a power steering gear (1-6), a steering oil pump (1-7), and a power steering gear (1-6) connected with a steering wheel (1-8), wherein the hydraulic booster with the braking master cylinder assembly (1-2) is connected with the steering oil tank (1-5) through the steering oil pump (1-7), and the hydraulic booster with the braking master cylinder assembly (1-2) is connected with the steering oil tank (1-5) through the power steering gear (1-6); the hydraulic booster assembly (1-2) with the master brake pump comprises a brake oil way (1-9), a steering oil way (1-10) and an energy accumulator (1-11), wherein the energy accumulator (1-11) is connected with the brake oil way (1-9) through an oil port (1-14) at the brake side of the energy accumulator, the energy accumulator (1-11) is connected with the steering oil way (1-10) through an oil port (1-13) at the steering side of the energy accumulator, pressure sensors (1-12) are arranged on oil ports (1-14) on the braking side of the energy accumulator, an oil port switch (1-33) at the steering side of the energy accumulator is arranged on the oil port (1-13) at the steering side of the energy accumulator, the braking oil way (1-9) is communicated with the steering oil way (1-10) through a thrust rod (1-15);
an oil inlet of the oil storage cup (1-1) is connected with a brake oil way (1-9) through a brake oil storage cup oil inlet pipeline (1-21), an oil outlet of the oil storage cup (1-1) is connected with the brake oil way (1-9) through a brake oil storage cup oil outlet pipeline (1-22), and a brake pedal (1-4) is connected with the brake oil way (1-9);
the brake oil way (1-9) is connected with a brake assembly belt ABS (1-3), and the brake assembly belt ABS (1-3) is connected with left and right brake cylinders of the front and rear axles;
the steering oil way (1-10) is connected with a steering oil tank (1-5) through a steering oil pump (1-7); the steering oil way (1-10) is connected with the steering oil tank (1-5) through a power steering gear (1-6), and the power steering gear (1-6) is connected with a steering wheel (1-8).
The steering oil pump (1-7), the pressure sensor (1-12), the energy accumulator steering side switch (1-33), the brake pedal (1-4) and the accelerator pedal (2-6) are electrically connected with the electric control device;
the oil pump DCAC controllers (2-7) adopt variable frequency oil pump controllers.
The brake oil circuit (1-9) is respectively connected with a brake cylinder R interface and a brake cylinder F interface of the brake assembly with the ABS (1-3) through a first high-pressure pipeline (1-23) and a second high-pressure pipeline (1-24), the front-axle left and right brake cylinders comprise a front-axle right brake cylinder (1-29), a front-axle left brake cylinder (1-30), a rear-axle right brake cylinder (1-31) and a rear-axle left brake cylinder (1-32), the brake assembly with the ABS (1-3) respectively passes through a third high-pressure pipeline (1-25), a fourth high-pressure pipeline (1-26), a fifth high-pressure pipeline (1-27), a sixth high-pressure pipeline (1-28), a front-axle right brake cylinder (1-29), a front-axle left brake cylinder (1-30), a rear-axle right brake cylinder (1-31), The rear axle left brake cylinder (1-32) is connected;
an oil pump motor (2-2) is installed on a steering oil pump (1-7), the steering oil pump (1-7) is connected with an oil inlet of a steering oil way (1-10) through a steering liquid assembly oil inlet pipeline (1-17), the steering oil pump (1-7) is connected with an oil outlet of a steering oil tank (1-5) through a steering device oil outlet pipeline (1-16), and the oil outlet of the steering oil way (1-10) is connected with an oil inlet of the steering oil tank (1-5) through a steering liquid oil return hose (1-20); oil outlets of the steering oil passages (1-10) are connected with oil inlets of the power steering gears (1-6) through steering oil passage oil outlet pipelines (1-18), and oil outlets of the power steering gears (1-6) are connected with oil inlets of the steering oil tanks (1-5) through oil return pipelines (1-19) of the power steering gears;
by adopting the energy accumulator with the oil pressure detection device and the steering side oil port switch, the high pressure of the energy accumulator for braking can be ensured in the braking process and the driving process. When an oil pump motor rotates at a high rotating speed, oil pressure is fed from a steering oil pump to a steering oil circuit and an energy accumulator, the steering oil circuit supplies oil pressure to a brake oil circuit through a thrust rod, when the oil pressure of an oil port on the brake side of the energy accumulator reaches a pressure value P1 required to be calibrated, the oil port on the steering side is closed at the moment, a pressure maintaining process is carried out, the energy accumulator always ensures very high energy storage pressure in the driving process, can reliably support 5 times of emergency braking, and ensures the reliability and safety of braking, when an accelerator is released, the braking requirement can be judged to exist, at the moment, the hydraulic oil is braked, the process of supplying pressure from the oil pump to the steering oil circuit to the brake oil circuit through the thrust rod is carried out, enough braking oil pressure for braking is not established yet, when a brake pedal is stepped on, the oil pressure fed back to the steering oil circuit through the thrust rod to the side of the brake oil circuit through the oil pump is not completely established, and the braking force distribution is established through the oil pressure of the energy accumulator at the same time, when the oil pressure of a brake oil path (from an oil pump to a steering oil path to the side of a brake oil path through a thrust rod) is established, when the brake is continued and after the brake is completed, if the pressure of an oil outlet of the energy accumulator is detected to be lower than a pressure value P to be calibrated, the pressure value P is a pressure threshold value of the oil pump DCAC requesting high-speed operation, the P is a value calibrated according to the brake, the requirement is mainly met for 5 times of continuous braking under the maximum quality, the pressure value of the P value is detected and judged by a vehicle controller, and at the same time, the steering oil pump is in a high-pressure and high-speed process, so that a pressure recovery process of the energy accumulator is realized; the high pressure and the high rotating speed are required to be maintained until the energy accumulator is completely punched, so that the process of strong vibration cannot occur in the pressurizing process of the energy accumulator, and the efficient, safe, comfortable and energy-saving braking process is further ensured.
With reference to fig. 2, the steering one-key start button (2-3), the brake pedal (1-4), the accelerator pedal (2-6), the pressure sensor (1-12) and the energy accumulator steering side switch (1-33) are respectively in low-voltage electric connection with the vehicle control unit VCU (2-4); the oil pump DCAC controller (2-7) is connected with the vehicle control unit (2-4) through a CAN (controller area network) line, the high-voltage distribution box PDU (2-1) is in high-voltage direct-current electric connection with the oil pump DCAC controller (2-7), and the high-voltage distribution box PDU (2-1) is in high-voltage direct-current electric connection with the electric box system (2-8); the oil pump motor (2-2) is in high-voltage alternating current connection with the oil pump DCAC controller (2-7), and the oil pump DCAC controller (2-7) controls the oil pump motor (2-2);
the high-voltage distribution box PDU (2-1) is responsible for distributing power to the high-voltage oil pump DCAC controller (2-7);
the oil pump motor (2-2) is responsible for supplying pressure to a steering and braking hydraulic circuit, the oil pump motor (2-2) is installed on a steering oil pump (1-7), the steering oil pump supplies pressure to a steering oil circuit (1-10) in a hydraulic booster with a brake master pump assembly (1-2), pressure is built on the braking oil circuit (1-9) through a thrust rod (1-15), pressure is supplied to an energy accumulator (1-11) at the same time, and the energy accumulator simultaneously builds pressure on the braking oil circuit (1-9);
the turning one-key starting button (2-3) adopts a reset switch and is responsible for maintaining the 30S turning test capability after high-voltage power-on, and provides a choice for a driver;
the VCU (2-4) of the vehicle control unit is responsible for outputting oil pump enable, and requesting the oil pump to require the rotating speed on the DCAC controller (2-7) of the variable frequency oil pump;
the brake pedal (1-4) is responsible for outputting a braking request;
the accelerator pedals (2-6) are responsible for outputting accelerator requests;
the oil pump DCAC controller (2-7) is responsible for controlling the oil pump to work normally;
the electronic box system (2-8) is responsible for supplying power to the whole system;
the pressure sensor (1-12) is arranged at an oil port at the braking side of the energy accumulator and is responsible for feeding back the oil pressure at the braking side of the energy accumulator to the whole vehicle controller (2-4);
the energy accumulator steering side switch (1-33) is responsible for receiving a level signal of the VCU, when the VCU outputs a low level, the steering side switch is turned on, oil pressure is built at the moment, and when the VCU outputs a suspension signal, the energy accumulator steering side switch is turned off at the moment;
a frequency conversion type adjusting method for a brake steering common oil pump comprises the following conditions:
1) when the vehicle is powered on, the vehicle control unit sends out the enabling of the oil pump motor and the control logic for requesting the rotating speed of the oil pump motor;
2) the vehicle control unit sends out oil pump enable and control logic of the oil pump request motor speed when driving;
3) the pressurization logic of the energy accumulator is used when the oil pump requests the rotating speed of the motor under the two conditions of power-on and driving;
with reference to fig. 3, fig. 3 is a control logic for sending the oil pump motor enable and requesting the oil pump motor rotation speed by the vehicle control unit when the vehicle control unit is powered on; the case 1) includes:
when the vehicle starts, firstly, whether KEY ON is performed or not is judged, when the KEY ON is not performed, state keeping is performed, after the KEY ON, the vehicle control unit starts to be awakened, the vehicle control unit detects the pressure value of the energy accumulator, at the moment, the vehicle control unit judges whether a system, READY and RUN are performed or not, if the system, READY and RUN are not detected, at the moment, the vehicle control unit judges whether a switch for starting the oil pump by pressing a KEY is arranged by a driver or not after the READY and RUN are detected, when the switch is pressed, the vehicle control unit can turn a vehicle by one stroke, the steering capacity of the oil pump can be tested, at the moment, the vehicle control unit requests the oil pump to enable, and the oil pump enters a high-rotation speed request state, if the vehicle control unit judges that the pressure of the energy accumulator is insufficient, at the moment, the vehicle control unit requests the oil pump to rotate at a rotation speed, the rotation speed is from 0 rotation speed to a high rotation speed, the DCAC controller of the oil pump sets a proper time, so that the time for the oil pump to reach the high rotation speed is as short as possible, at the moment, the pressure filling time of the energy accumulator can be ensured to be as short as possible, so that the energy storage process is ensured, the impact vibration of an oil way is as small as possible, so that the comfort performance of a cab is ensured, and the VCU sends a low level to an oil port switch at the steering side of the energy accumulator, and the switch is opened to carry out pressurization;
the oil pump one-key starting button is a reset switch, and if the hand brake is not released in the delay time, the vehicle control unit requests the oil pump to enter a low-rotation-speed state; if the hand brake is released later or within 30s, the gear condition (neutral, forward gear and reverse gear) of the vehicle is judged, if the gear is not neutral, the state of the energy accumulator is detected firstly, if the energy accumulator needs to be pressurized, the vehicle control unit sends the oil pump to enable, the oil pump motor enters a high request rotating speed state, the VCU sends a low level to a switch of an oil port at the steering side of the energy accumulator, the switch is opened, the time from 0 rotating speed to high rotating speed is as short as possible, the pressurizing time of the energy accumulator is set as Ns, the Ns is the calibration quantity of time, the specific pressurizing time is combined with a specific vehicle type and matched, the calculated and calibrated time value is obtained, if the pressurizing of the energy accumulator in the Ns is completed, the vehicle speed does not reach 20km/h, at the moment, the vehicle is defaulted to turn, the high rotating speed request of the oil pump is still kept until the vehicle speed exceeds 20km/h, if pressurization in Ns is finished, the vehicle speed exceeds 20km/h, the VCU requests the oil pump to work at a low rotating speed, meanwhile, a suspension signal is sent to an oil port switch on the steering side of the energy accumulator, the switch is closed, and the energy accumulator maintains pressure; if the vehicle speed exceeds 20km/h in Ns and the accumulator is not fully pressurized to the P1 state, the high rotating speed state of the oil pump is still maintained until the Ns accumulator is fully pressurized, and if the accumulator is not fully pressurized in Ns, an accumulator pressurization failure is reported, and a driver needs to stop immediately.
With reference to fig. 4, fig. 4 is a control logic for the vehicle controller to send the oil pump enable and the oil pump request rotation speed during driving; the case 2) includes:
at the moment, because the state of a hand brake and the gear state (forward gear, neutral gear and reverse gear) of the vehicle are judged in the driving process, the hand brake signal is changed from 0 to 1 or has a gear change, and the vehicle controller is judged for the pressure of the energy accumulator after being in a non-neutral gear, the aim is to prevent the pressure of the energy accumulator from being released rapidly after the vehicle is braked completely, so that the condition of no coming and pressure compensation is generated, at the moment, if the driver starts quickly, the pressure of the energy accumulator exceeds 20Km/h in Ns and the pressure is not increased to a P1 value, the oil pump still needs to be required to enter a high request rotating speed state, if the energy accumulator is not completely increased in Ns, the pressure increasing fault of the energy accumulator is reported, the driver needs to be put into the neutral gear immediately, if the vehicle speed is more than 0 and less than 20Km/h, at the moment, the vehicle controller needs to send the enabling of the oil pump, and requesting a high rotation speed of the oil pump; when the vehicle speed is more than 20km/h, the vehicle control unit sends an oil pump enable and requests the oil pump to rotate at a low speed, which is a detection carried out in the process that an accelerator signal exists all the time, if the accelerator signal does not exist, the vehicle is judged to have the possibility of braking at the moment, the vehicle control unit continuously judges the pressure condition of an energy accumulator, if the pressure of the energy accumulator becomes low, an alarm needs to be given out at the moment, a driver is informed of stopping as soon as possible, the energy accumulator has the pressure leakage condition, if the pressure of the energy accumulator does not have a problem, the oil pump is requested to rotate at a high speed, if the accelerator pedal is not stepped, the vehicle control unit judges that the brake pedal is not stepped within 5s, the vehicle control unit continues to send the oil pump enable and requests the rotating speed in the oil pump to work; certainly, if a driver has stepped on the brake pedal within 5s, at the moment, the energy accumulator and the motor braking energy are required to feed back to brake before the oil pressure of the oil pump is not established, and then the oil pressure of the oil pump and the motor braking energy are fed back to brake, so that the smoothness of the braking process and the comfort of the brake pedal are ensured. After primary braking is finished, a braking signal is finished, the vehicle control unit detects whether the pressure of the energy accumulator is lower than a P value, if so, the VCU vehicle control unit requests the oil pump to work at a high rotating speed, and sends a low level to the oil port switch at the steering side of the energy accumulator, and the switch opens the energy accumulator to enter a pressurization flow to pressurize to the P1 value, and if not, the vehicle control unit sends oil pump enabling and requests the rotating speed in the oil pump to work.
With reference to fig. 5, fig. 5 illustrates the boost logic of the accumulator; the case 3) includes:
when the voltage of a brake pedal is detected to be in a non-braking state, the vehicle control unit sends an oil pump enable and requests the oil pump to have high rotation speed, when the voltage of the brake pedal is detected to be in the non-braking state, the vehicle control unit judges the pressure of the energy accumulator and judges that the outlet pressure is smaller than a P value, if the energy accumulator does not need to be pressurized, the vehicle control unit keeps in an original state, if pressurization is needed, the vehicle control unit sends the oil pump enable at the moment, the oil pump enters a high-request rotation speed state, the VCU vehicle control unit sends a low level to a switch on a steering side of the energy accumulator, a switch is turned on, pressurization is carried out, the time from 0 rotation speed to high rotation speed is as short as possible, the pressurization time of the energy accumulator is set to be Ns, if pressurization of the energy accumulator in Ns is finished, the VCU sends a suspension signal to the switch on the steering side of the energy accumulator at the moment, and the switch is turned off, and pressure maintaining is carried out; if the accumulator is not fully pressurized when the accumulator is at Ns, the accumulator pressurization fault is reported, and the driver needs to stop immediately.
In a word, aiming at the light weight requirement of a vehicle, the derived conventional braking and steering common oil pump system designs a braking and steering system and a set of control logic, wherein the braking and steering system comprises an energy accumulator, a pressure switch, a hydraulic booster with a master brake pump assembly and the like, and an oil port switch; under different driving conditions, the problem of safety and energy conservation is considered, and the variable-frequency energy-saving effect is realized by adjusting the DCAC controller of the oil pump; because the braking steering common oil pump, if the oil pump is in constant frequency, the oil pump always works at a rated rotating speed, and the oil pump DCAC also works at a rated power, so that the energy consumption of the controller is very high, and the aim of saving energy cannot be fulfilled; because the braking and steering share the oil pump, the oil pump needs to face different modes under different forms of working conditions; when different working conditions are entered, the conditions possibly occurring at the moment are judged according to the specific speed and the specific running mode so as to ensure the specific power matching; when braking, the frequency conversion processing can be carried out to a certain degree according to the specific speed, the driving condition and the intention judgment of a driver so as to ensure enough braking force, and certain coordination is carried out under two different conditions so as to achieve the purpose of energy conservation; especially, when braking, the energy accumulator, the pressure switch and the oil port switch are additionally arranged, so that the braking process is rapid, safe, efficient and energy-saving.
In the description of the present invention, the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "vertical", "horizontal", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for the purpose of describing the present invention but do not require that the present invention must be constructed or operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" in the present invention should be interpreted broadly, and may be connected or disconnected, for example; the terms may be directly connected or indirectly connected through intermediate components, and specific meanings of the terms may be understood as specific conditions by those skilled in the art.
The above description is of the preferred embodiment of the present invention, and the description of the specific embodiment is only for better understanding of the idea of the present invention. It will be appreciated by those skilled in the art that various modifications and equivalents may be made in accordance with the principles of the invention and are considered to be within the scope of the invention.
Claims (8)
1. A frequency conversion type adjusting system of a braking and steering shared oil pump is characterized by comprising an oil storage cup (1-1), a hydraulic booster with a braking master cylinder assembly (1-2), a braking assembly with ABS (1-3), a braking pedal (1-4), a steering oil tank (1-5), a power steering gear (1-6), a steering oil pump (1-7) and a power steering gear (1-6) which are connected with a steering wheel (1-8), wherein the hydraulic booster with the braking master cylinder assembly (1-2) is connected with the steering oil tank (1-5) through the steering oil pump (1-7), and the hydraulic booster with the braking master cylinder assembly (1-2) is connected with the steering oil tank (1-5) through the power steering gear (1-6); the hydraulic booster assembly (1-2) with the master brake pump comprises a brake oil way (1-9), a steering oil way (1-10) and an energy accumulator (1-11), wherein the energy accumulator (1-11) is connected with the brake oil way (1-9) through an oil port (1-14) at the brake side of the energy accumulator, the energy accumulator (1-11) is connected with the steering oil way (1-10) through an oil port (1-13) at the steering side of the energy accumulator, a pressure sensor (1-12) is arranged on an oil port (1-14) at the braking side of the energy accumulator, the energy accumulator turning side oil port switch (1-33) is arranged on the energy accumulator turning side oil port (1-13), the braking oil way (1-9) is communicated with the steering oil way (1-10) through a thrust rod (1-15);
an oil inlet of the oil storage cup (1-1) is connected with a brake oil way (1-9) through a brake oil storage cup oil inlet pipeline (1-21), an oil outlet of the oil storage cup (1-1) is connected with the brake oil way (1-9) through a brake oil storage cup oil outlet pipeline (1-22), and a brake pedal (1-4) is connected with the brake oil way (1-9);
the brake oil way (1-9) is connected with a brake assembly belt ABS (1-3), and the brake assembly belt ABS (1-3) is connected with left and right brake cylinders of the front and rear axles;
the steering oil way (1-10) is connected with a steering oil tank (1-5) through a steering oil pump (1-7); the steering oil way (1-10) is connected with a steering oil tank (1-5) through a power steering gear (1-6), and the power steering gear (1-6) is connected with a steering wheel (1-8);
the steering oil pump (1-7), the pressure sensor (1-12), the energy accumulator steering side switch (1-33), the brake pedal (1-4) and the accelerator pedal (2-6) are electrically connected with the electric control device.
2. The variable-frequency adjustment system for the brake-steering shared oil pump according to claim 1, characterized in that the oil pump DCAC controller (2-7) adopts a variable-frequency oil pump controller.
3. The variable-frequency adjusting system of the brake-steering common oil pump as claimed in claim 1, wherein the brake oil path (1-9) is connected with the R interface and the F interface of the brake sub-pump of the brake assembly with the ABS (1-3) through a first high-pressure pipeline (1-23) and a second high-pressure pipeline (1-24), the left and right brake sub-pumps of the front and rear shafts comprise a front-shaft right brake sub-pump (1-29), a front-shaft left brake sub-pump (1-30), a rear-shaft right brake sub-pump (1-31) and a rear-shaft left brake sub-pump (1-32), the brake assembly with the ABS (1-3) is connected with the front-shaft right brake sub-pump (1-29), a high-pressure pipeline four (1-26), a high-pressure pipeline five (1-27), a high-pressure pipeline six (1-28) and a front-shaft right brake sub-pump (1-29) through a third high-pressure pipeline (1-23), a high-pressure pipeline two (1-24), and a high-24), respectively, The front axle left brake cylinder (1-30), the rear axle right brake cylinder (1-31) and the rear axle left brake cylinder (1-32) are connected;
an oil pump motor (2-2) is installed on a steering oil pump (1-7), the steering oil pump (1-7) is connected with an oil inlet of a steering oil way (1-10) through a steering liquid assembly oil inlet pipeline (1-17), the steering oil pump (1-7) is connected with an oil outlet of a steering oil tank (1-5) through a steering device oil outlet pipeline (1-16), and the oil outlet of the steering oil way (1-10) is connected with an oil inlet of the steering oil tank (1-5) through a steering liquid oil return hose (1-20); the oil outlets of the steering oil passages (1-10) are connected with the oil inlets of the power steering gears (1-6) through oil outlet pipelines (1-18) of the steering oil passages, and the oil outlets of the power steering gears (1-6) are connected with the oil inlets of the steering oil tanks (1-5) through oil return pipelines (1-19) of the oil through pipelines of the power steering gears.
4. The variable-frequency adjusting system of the braking-steering common oil pump according to claim 1, characterized in that the electric control device comprises a vehicle control unit VCU (2-4), a high-voltage distribution box PDU (2-1), an electric box system (2-8), a steering one-key opening button (2-3), a brake pedal (1-4), an accelerator pedal (2-6), an oil pump DCAC controller (2-7), a pressure sensor (1-12), an energy accumulator steering side switch (1-33) and an oil pump motor (2-2);
the steering one-key starting button (2-3), the brake pedal (1-4), the accelerator pedal (2-6), the pressure sensor (1-12) and the energy accumulator steering side switch (1-33) are respectively in low-voltage electric connection with the vehicle control unit VCU (2-4); the oil pump DCAC controller (2-7) and the vehicle controller (2-4) are connected through a CAN (controller area network) line, the high-voltage distribution box PDU (2-1) is in high-voltage direct-current electric connection with the oil pump DCAC controller (2-7), and the high-voltage distribution box PDU (2-1) is in high-voltage direct-current electric connection with the electric box system (2-8); the oil pump motor (2-2) is in high-voltage alternating current connection with the oil pump DCAC controller (2-7), and the oil pump DCAC controller (2-7) controls the oil pump motor (2-2);
the high-voltage distribution box PDU (2-1) is responsible for distributing power to the high-voltage oil pump DCAC controller (2-7);
the oil pump motor (2-2) is responsible for supplying pressure to a steering and braking hydraulic circuit, the oil pump motor (2-2) is installed on a steering oil pump (1-7), the steering oil pump supplies pressure to a steering oil path (1-10) in a hydraulic booster with a brake master pump assembly (1-2), pressure is built on the braking oil path (1-9) through a thrust rod (1-15), pressure is supplied to an energy accumulator (1-11) at the same time, and the energy accumulator simultaneously builds pressure on the braking oil path (1-9);
a steering one-key starting button (2-3) adopts a reset switch and is responsible for maintaining the steering test run capability of 30S after high-voltage power-on, and a choice is provided for a driver;
the VCU (2-4) of the vehicle control unit is responsible for outputting oil pump enable, and requesting the oil pump required rotating speed on the DCAC controller (2-7) of the variable frequency oil pump;
the brake pedal (1-4) is responsible for outputting a braking request;
the accelerator pedals (2-6) are responsible for outputting accelerator requests;
the oil pump DCAC controller (2-7) is responsible for controlling the oil pump to work normally;
the electric box system (2-8) is responsible for supplying power to the whole system;
the pressure sensor (1-12) is arranged at an oil port at the braking side of the energy accumulator and is responsible for feeding back the oil pressure at the braking side of the energy accumulator to the whole vehicle controller (2-4);
the energy accumulator steering side switch (1-33) is responsible for receiving a level signal of the VCU, when the VCU outputs a low level, the steering side switch is turned on, oil pressure is built at the moment, and when the VCU outputs a suspension signal, the energy accumulator steering side switch is turned off at the moment.
5. An adjusting method of an inverter type adjusting system of a brake steering common oil pump according to any one of claims 1 to 4, comprising the following conditions:
1) when the vehicle is powered on, the vehicle control unit sends out control logics for enabling the oil pump motor and requesting the rotating speed of the oil pump motor;
2) the vehicle control unit sends out oil pump enable and control logic of the oil pump request motor speed when driving;
3) and under the two conditions of power on and driving, the oil pump requests the motor speed, and the energy accumulator is subjected to pressurization logic.
6. The variable frequency adjustment method for a brake steering common oil pump according to claim 5, wherein said case 1) includes:
when the vehicle starts, firstly, whether the KEY is turned ON is judged, when the KEY is not turned ON, state maintenance is carried out, after the KEY is turned ON, the vehicle control unit starts to be awakened, the vehicle control unit detects the pressure value of the energy accumulator, the vehicle control unit judges whether a system, READY and RUN are required, if the system, READY and RUN are not detected, the state maintenance is carried out, after READY and RUN are detected, the vehicle control unit judges whether a switch for starting the oil pump by pressing a KEY is arranged ON the driver, when the switch is pressed, the vehicle control unit can drive a steering wheel to test the steering capacity of the oil pump, the vehicle control unit requests the oil pump to enable the oil pump and enables the oil pump to enter a high-rotating-speed request state, if the vehicle control unit judges that the pressure of the energy accumulator is insufficient, the vehicle control unit requests the rotating speed of the oil pump at the moment, the rotating speed of the vehicle control unit is from 0 rotating speed to high rotating speed, the DCAC controller of the oil pump sets a proper time to ensure that the time for reaching the high rotating speed is as short as possible, the pressure filling time of the energy accumulator can be ensured to be as short as possible, so that the energy storage process is ensured, the impact vibration of an oil way is as small as possible, the comfort performance of a cab is ensured, the VCU sends a low level to an oil port switch at the steering side of the energy accumulator, and the switch is opened to carry out pressurization;
the oil pump one-key starting button is a reset switch, and if the hand brake is not released within the delay time, the vehicle control unit requests the oil pump to enter a low-rotation-speed state; if the hand brake is released later or within 30s, judging the gear condition of the vehicle: neutral, forward, reverse; if the energy accumulator is not in neutral, firstly detecting the state of the energy accumulator, if the energy accumulator needs to be pressurized, then sending an oil pump enable by the vehicle control unit, enabling an oil pump motor to enter a high-request rotating speed state, sending a low level to an oil port switch at the steering side of the energy accumulator by the VCU, opening the switch, enabling the time from 0 rotating speed to high rotating speed to be as short as possible, setting the pressurization time of the energy accumulator to be Ns, wherein the Ns is a calibration quantity of time, the specific pressurization time is a time value calculated and calibrated by combining a specific vehicle type and matching, if the pressurization of the energy accumulator in Ns is finished and the vehicle speed does not reach 20km/h, then defaulting the vehicle to need to turn, still keeping the high-rotating speed request of the oil pump until the vehicle speed exceeds 20km/h, if the pressurization in Ns is finished, then the vehicle speed exceeds 20km/h, then requesting the low-rotating speed of the oil pump to work, meanwhile, a suspension signal is sent to an oil port switch at the steering side of the energy accumulator, the switch is closed, and the pressure of the energy accumulator is maintained; if the vehicle speed exceeds 20km/h in Ns and the accumulator is not fully pressurized to the P1 state, the high-speed state of the oil pump is still maintained until the Ns accumulator is fully pressurized, and if the accumulator is still not fully pressurized in Ns, an accumulator pressurization failure is reported and the vehicle needs to be stopped immediately.
7. The variable frequency adjustment method of a brake steering common oil pump according to claim 5, wherein the case 2) includes:
at this time, during the driving process, the hand brake state and the gear state of the vehicle are as follows: judging a forward gear, a neutral gear and a reverse gear, judging the pressure of an energy accumulator by a vehicle controller after a hand brake signal is changed from 0 to 1 or has a gear, and judging the pressure of the energy accumulator by the vehicle controller after the hand brake signal is in a non-neutral gear, aiming at preventing the energy accumulator from rapidly releasing pressure after the vehicle is completely braked to cause the generation of the situations of no incoming pressure and pressure compensation, still requiring an oil pump to enter a high-request rotating speed state if a driver starts quickly, exceeds 20Km/h in Ns and the pressure increase does not reach a P1 value, reporting the pressure increase fault of the energy accumulator if the energy accumulator is not completely increased in Ns, requiring the driver to be immediately engaged in the neutral gear, and requiring the vehicle controller to send enabling energy and request high rotating speed if the vehicle speed is more than 0 and less than 20 Km/h; when the vehicle speed is more than 20km/h, the vehicle control unit sends an oil pump enable and requests the oil pump to have a low rotating speed, which is detection carried out in the process that an accelerator signal exists all the time, if the accelerator signal does not exist, the vehicle is judged to have the possibility of braking at the moment, the vehicle control unit continuously judges the pressure condition of an energy accumulator, if the pressure of the energy accumulator becomes low, an alarm needs to be carried out at the moment to inform a driver that the vehicle stops as soon as possible, the pressure leakage condition of the energy accumulator exists, if the pressure of the energy accumulator has no problem, the oil pump is requested to have a high rotating speed at the moment, if the accelerator pedal is not stepped, the brake pedal is not stepped within 5s at the moment, the vehicle control unit continuously sends the oil pump enable and requests the rotating speed in the oil pump to work at the moment; if the driver has stepped on the brake pedal within 5s, the energy accumulator and the motor braking energy are required to feed back for braking before the oil pump oil pressure is not established, and then the oil pump oil pressure and the motor braking energy are fed back for braking, so that the smoothness of the braking process and the comfort of the brake pedal are ensured; after primary braking is finished, a braking signal is finished, the vehicle control unit detects whether the pressure of the energy accumulator is lower than a P value, if so, the VCU vehicle control unit requests the oil pump to work at a high rotating speed, and sends a low level to the oil port switch at the steering side of the energy accumulator, and the switch opens the energy accumulator to enter a pressurization flow to pressurize to the P1 value, and if not, the vehicle control unit sends oil pump enabling and requests the rotating speed in the oil pump to work.
8. The variable frequency adjustment method for a brake steering common oil pump according to claim 5, wherein said case 3) includes:
when the voltage of a brake pedal is detected to be in a non-braking state, the vehicle control unit sends an oil pump enable and requests the oil pump to have high rotation speed, when the voltage of the brake pedal is detected to be in the non-braking state, the vehicle control unit judges the pressure of the energy accumulator, judges that the outlet pressure is smaller than a P value, judges that the energy accumulator does not need to be pressurized, keeps in an original state, if pressurization is needed, the vehicle control unit sends the oil pump enable at the moment, the oil pump enters a high-request rotation speed state, the VCU vehicle control unit sends a low level to a switch on the steering side of the energy accumulator, a switch is turned on to pressurize, the time from 0 rotation speed to high rotation speed is as short as possible, the pressurization time of the energy accumulator is set to be Ns, if pressurization of the energy accumulator in Ns is completed, the VCU sends a suspension signal to the switch on the steering side of the energy accumulator, and the switch is turned off to maintain pressure; if the accumulator is still not fully charged at Ns, an accumulator charge failure is reported and the driver needs to stop immediately.
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| CN116161109A (en) * | 2023-02-28 | 2023-05-26 | 中国重汽集团济南动力有限公司 | Steering pump control strategy implementation method and device and storage medium |
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