CN104442773A - Method and system for matching and adjusting vacuum degree of vacuum booster of vehicle - Google Patents
Method and system for matching and adjusting vacuum degree of vacuum booster of vehicle Download PDFInfo
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- CN104442773A CN104442773A CN201310455019.0A CN201310455019A CN104442773A CN 104442773 A CN104442773 A CN 104442773A CN 201310455019 A CN201310455019 A CN 201310455019A CN 104442773 A CN104442773 A CN 104442773A
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- booster
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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
- B60T13/24—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 gaseous
- B60T13/46—Vacuum systems
- B60T13/52—Vacuum systems indirect, i.e. vacuum booster units
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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
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/72—Electrical control in fluid-pressure brake systems in vacuum systems or vacuum booster units
Abstract
The invention provides a method and system for matching and adjusting the vacuum degree of a vacuum booster of a vehicle. The method comprises the steps that S1, the vacuum degree of the vacuum booster of the vehicle is obtained, and whether the vacuum degree is smaller than a first preset vacuum degree is judged; S2, when the vacuum degree is smaller than the preset first preset vacuum degree, load control logic or idle control logic is carried out, wherein the load control logic comprises the steps that A1, a vehicle speed signal or an accelerator pedal signal is obtained, and A2, when a vehicle speed is within a preset value range and an accelerator pedal is not stepped, a vehicle load is switched off; the idle control logic comprises the steps that B1, vehicle gear signals are obtained, and B2, when a vehicle gear is not in a P-gear state or N-gear state, the idle speed of an engine is increased. According to the method and system for matching and adjusting the vacuum degree of the vacuum booster of the vehicle, the vacuum degree of the vacuum booster of the vehicle is improved by stopping the load or increasing the idle speed of the engine, so that output force is increased, the braking force is larger, and drive safety is improved.
Description
Technical field
The present invention relates to technical field of vehicle, particularly a kind of Matching and modification method of vehicle vacuum booster vacuum degree and system thereof.
Background technology
Along with the development of manned vehicle technology, client, on the basis meeting the key property such as traveling comfort, dynamic property, starts the safety more paying attention to car, requires more and more higher for vehicle braking performances.Most cars adopts vacuum booster, makes manpower and power and uses.The vacuum source of the brake system vacuum booster unit of traditional combustion engine car comes from engine intake manifold.The manifold air pressure of induction maniflod and the difference of bar pressure are degree of vacuum.
Vacuum booster is generally installed between brake pedal and master brake cylinder, by pedal by push rod direct control.The power that servo-unit and pedal produce is superimposed and acts on master brake cylinder push rod, to improve the delivery pressure of master brake cylinder.The servo vacuum air chamber of vacuum booster is divided into normal pressure room and transformation room by the piston with rubber diaphragm, and the degree of vacuum of general normal pressure room is 0.6Bar ~ 0.8Bar.The size of power-assisted that can provide vacuum booster depends on the size of its normal pressure room and transformation room air pressure difference.When the degree of vacuum of transformation room reaches external atmosphere pressure, vacuum booster can provide maximum brake boost.
In order to improve traveling comfort and the convenient driving of car load, on contemporary automotive, high-performance air-conditioning, Automatic Transmission, back mirror electro heat, rear window heating become standard configuration, the absolute pressure which results in induction maniflod is more and more higher, simultaneously because vehicle economy requires more and more higher, the driving engine of small displacement becomes the trend of development of automobile, in order to the requirement of the traveling comfort and convenient driving that meet car load, degree of vacuum to downward trend development gradually, the safety that impact is driven.
As everyone knows, between barometric pressure and sea level elevation, relation can represent by relational expression as follows:
Wherein: P
0be standard atmosphere, equal 1013.25mbar; Altitude is the sea level elevation in units of rice; P is the air pressure in units of mbar at a certain height.
Please refer to Fig. 1, Fig. 1 describes the relation of change of atmospheric pressure and sea level elevation according to formula above.As shown in Figure 1, when height is from sea level rise to height above sea level 11, when 000 meter high, barometric pressure drops to 230mbar from 1013.25mbar.We are not difficult to find out from figure, and when height is lower than 1, when 500 meters, barometric pressure almost linearly reduces, and every 100 meters are approximately reduced 11.2mbar, and namely every 10 meters are approximately reduced 1.1mbar.
So vacuum boost system to meet under nominal situation while brake provides power-assisted, vacuum boost system how is being allowed to provide efficient power-assisted to be also a problem faced by current car designer in high altitude region.Because along with the continuous rising of sea level elevation, bar pressure is downward trend, enough degree of vacuum now cannot be provided to vacuum boost system, especially under engine high load work, vacuum boost system more cannot meet the needs of brake system, brake pedal force obviously increases, and there is severe compromise.
Summary of the invention
The features and advantages of the present invention are partly stated in the following description, or can be apparent from this description, or learn by putting into practice the present invention.
For overcoming the problem of prior art, the invention provides a kind of Matching and modification method and system thereof of vehicle vacuum booster vacuum degree, when vehicle vacuum booster vacuum degree is low, by closing vehicle load or improving the degree of vacuum that idling speed carrys out lifting vehicle vacuum booster, thus improve drive safety.
It is as follows that the present invention solves the problems of the technologies described above adopted technical scheme:
According to an aspect of the present invention, a kind of Matching and modification method of vehicle vacuum booster vacuum degree is provided, comprises: the degree of vacuum of S1, acquisition vehicle vacuum servo-unit, and judge whether this degree of vacuum is less than the first default degree of vacuum; S2, when this degree of vacuum is less than the first default degree of vacuum, then enter load control logic or idle-speed control logic; Wherein this load control logic comprises step: A1, acquisition vehicle speed signal and accelerator pedal signal; A2, when the speed of a motor vehicle is in default number range and Das Gaspedal is not operated, then close vehicle load; This idle-speed control logic comprises step: B1, acquisition automobile gear level signal; B2, when automobile gear level is not in P shelves or N shelves state, promote engine idle rotational.
According to one embodiment of present invention, in this step S1, also comprise step: obtain air-distributor pressure signal, and calculate the sea level elevation residing for this vehicle accordingly; When this sea level elevation is higher than the minimum sea level elevation preset, enter this step S2.
According to one embodiment of present invention, all sea level elevations are divided between several Altitude Region, according to braking requirement to setting different vehicle vacuum booster vacuum degree scopes between different Altitude Regions, the lower limit wherein in this vehicle vacuum booster vacuum degree scope is this first degree of vacuum in this Altitude Region.
According to one embodiment of present invention, also comprise in this step S1: according to degree of vacuum and this sea level elevation of calculating of this vehicle vacuum servo-unit obtained, whether both judgements mate, if do not mate, then carry out record.
According to one embodiment of present invention, also step is comprised: the degree of vacuum drawing this air-distributor pressure according to air-distributor pressure calculated signals in this step S1, judge that the difference of the degree of vacuum of this air-distributor pressure and the degree of vacuum of this vehicle vacuum servo-unit is whether in the scope preset, if not in this scope preset, then give the alarm.
According to one embodiment of present invention, in this step S2, when this degree of vacuum is less than the first default degree of vacuum, be introduced into this load control logic, now: if this vehicle load is in opening, then close this vehicle load, the degree of vacuum of vehicle vacuum servo-unit is then obtained, if this degree of vacuum is still less than this first degree of vacuum, then enter idle-speed control logic.If this vehicle load is in closed condition, then enter this idle-speed control logic.
According to one embodiment of present invention, this load control logic also comprises step: A3, the degree of vacuum obtaining vehicle vacuum servo-unit, vehicle speed signal and accelerator pedal signal; If this degree of vacuum of A4 is greater than the second default degree of vacuum, or the speed of a motor vehicle is in default number range, or when this Das Gaspedal is not operated, then exit this load control logic, wherein this second degree of vacuum is greater than this first degree of vacuum; This idle-speed control logic also comprises step: the degree of vacuum of B3, acquisition vehicle vacuum servo-unit; B4, when this degree of vacuum is less than this second degree of vacuum, continue promote this engine idle rotational, until this degree of vacuum is greater than this second degree of vacuum.
According to one embodiment of present invention, also comprise in the step B2 of this idle-speed control logic: close in load, and when this degree of vacuum is less than this first degree of vacuum, if automobile gear level is in P shelves or N shelves, then give the alarm.
According to one embodiment of present invention, this vehicle load comprises air-conditioning, back mirror electric heating system, rear window electric heating system.
According to another aspect of the present invention, a kind of Matching and modification system of vehicle vacuum booster vacuum degree is provided, comprises: sensor assembly, for obtaining degree of vacuum, vehicle speed signal, the accelerator pedal signal of vehicle vacuum servo-unit; Electronic control unit, for receiving the signal that automobile gear level signal and this sensor assembly send, and judges whether this degree of vacuum is less than the first default degree of vacuum; When this degree of vacuum is less than the first default degree of vacuum, vehicle speed is in default number range, and when this Das Gaspedal is not operated, controls to close vehicle load; Maybe when this degree of vacuum is less than the first default degree of vacuum, and when automobile gear level is not in P shelves or N shelves state, control to promote engine idle rotational.
According to one embodiment of present invention, also comprising gearbox control, be connected with this electronic control unit, obtaining automobile gear level signal for making this electronic control unit; This sensor assembly comprises the vacuum sensor for obtaining vehicle vacuum booster vacuum degree, for obtaining the car speed sensor of vehicle speed signal, for obtaining the pedal sensor of accelerator pedal signal.
According to one embodiment of present invention, also comprise compressor module, be connected with this electronic control unit, for closing according to the control of this electronic control unit or opening air-conditioning.
According to one embodiment of present invention, also comprise electro heat module, be connected with this electronic control unit, for closing according to the control of this electronic control unit or opening back mirror electric heating system, rear window electric heating system.
According to one embodiment of present invention, this electronic control unit also for receiving air-distributor pressure signal, and: calculate the sea level elevation residing for vehicle accordingly; Simultaneously according to the degree of vacuum of this vehicle vacuum servo-unit and this sea level elevation of calculating, whether both judgements mate, if do not mate, then carry out record; Or calculate the degree of vacuum of this air-distributor pressure accordingly, judge that the difference of the degree of vacuum of this air-distributor pressure and the degree of vacuum of this vehicle vacuum servo-unit is whether in the scope preset, if not in this scope preset, then give the alarm.
According to one embodiment of present invention, this electronic control unit also for closing in this vehicle load, and when this degree of vacuum is less than this first degree of vacuum, when automobile gear level is in P shelves or N shelves, gives the alarm.
The invention provides a kind of Matching and modification method and system thereof of vehicle vacuum booster vacuum degree, when vehicle vacuum booster vacuum degree is low, by closing vehicle load or improving the degree of vacuum that idling speed carrys out lifting vehicle vacuum booster, thus improve drive safety.In order to the traveling comfort driven, can by closing vehicle load or improving the degree of vacuum that idling speed carrys out lifting vehicle vacuum booster just more than certain height above sea level also can be limited to.When vehicle vacuum booster vacuum degree is lower, first can carry out the degree of vacuum of lifting vehicle vacuum booster by closing load, if after closing load, degree of vacuum or low, carrying out the degree of vacuum of lifting vehicle vacuum booster again by improving engine idle rotational, so improving fuel economy.The present invention is in order to improve the safety of driving further, more add alarm control flow process, when whether the difference of the degree of vacuum of air-distributor pressure and the degree of vacuum of vehicle vacuum servo-unit is in the scope preset, or when air-conditioning is in closed condition, automobile gear level, at N or P shelves, all can send warning when degree of vacuum is less than the first default degree of vacuum simultaneously.
By reading specification sheets, those of ordinary skill in the art will understand the characteristic sum content of these technical schemes better.
Accompanying drawing explanation
Below by with reference to accompanying drawing describe the present invention particularly in conjunction with example, advantage of the present invention and implementation will be more obvious, wherein content shown in accompanying drawing is only for explanation of the present invention, and does not form restriction of going up in all senses of the present invention, in the accompanying drawings:
Fig. 1 is the schematic diagram of the relation of change of atmospheric pressure and sea level elevation.
Fig. 2 is vacuum booster input-output characteristic figure.
Fig. 3 is the structural representation of the Matching and modification system of vehicle vacuum booster vacuum degree of the present invention.
Fig. 4 is the concrete structure schematic diagram of the Matching and modification system of vehicle vacuum booster vacuum degree of the present invention.
Fig. 5 is the step schematic diagram of the Matching and modification method of vehicle vacuum booster vacuum degree of the present invention.
Fig. 6 is the idiographic flow schematic diagram of the Matching and modification method of vehicle vacuum booster vacuum degree of the present invention.
Fig. 7 is the idiographic flow schematic diagram of the Matching and modification method of first embodiment of the invention vehicle vacuum booster vacuum degree.
Fig. 8 is the idiographic flow schematic diagram of the Matching and modification method of second embodiment of the invention vehicle vacuum booster vacuum degree.
Fig. 9 is the step schematic diagram of load control logic of the present invention.
Figure 10 is the step schematic diagram of idle-speed control logic of the present invention.
Figure 11 is the idiographic flow schematic diagram of the Matching and modification method of third embodiment of the invention vehicle vacuum booster vacuum degree.
Figure 12 is alarm control schematic flow sheet of the present invention.
Detailed description of the invention
Please refer to Fig. 2, Fig. 2 is vacuum booster input-output characteristic figure.Visible degree of vacuum is higher, and the output characteristic of servo-unit is better, and under the prerequisite of same Input Forces, power output is larger, and rate of braking is higher.Therefore in brake pedal force one timing, the degree of vacuum improving vacuum booster just can improve drive safety.
As shown in Figure 3, Figure 4, the invention provides a kind of Matching and modification system of vehicle vacuum booster vacuum degree, comprising: sensor assembly 10, for obtaining degree of vacuum, vehicle tach signal, accelerator pedal signal, the automobile gear level signal of vehicle vacuum servo-unit; Electronic control unit 20, for receiving the signal that this sensor assembly sends, for judging whether this degree of vacuum is less than the first default degree of vacuum; When this degree of vacuum is less than the first default degree of vacuum, vehicle speed is in default number range, and when this Das Gaspedal is not operated, controls to close vehicle load; Maybe when this degree of vacuum is less than the first default degree of vacuum, and when automobile gear level is not in P shelves or N shelves state, control to promote engine idle rotational.
In the specific implementation, the sensor module 10 can comprise vacuum sensor 11 for obtaining vehicle vacuum booster vacuum degree, for obtain vehicle speed signal car speed sensor 12, for obtaining the accelerator pedal sensor 13 of accelerator pedal signal.Automobile gear level signal is then by gearbox control 30(Transmission Control Unit, TCU) first receive and send to electronic control unit 20 again, that is gearbox control 30 obtains automobile gear level signal for making this electronic control unit 20, above-mentioned information can be sent to electronic control unit 20 by driving engine bus, in the present invention, electronic control unit 20 is exactly ECU(Electronic Control Unit).
In the present embodiment, also comprise compressor module 40, be connected with this electronic control unit 20, for closing according to the control of this electronic control unit or opening air-conditioning.Also comprise electro heat module 50, be connected with this electronic control unit 20, for closing according to the control of this electronic control unit or opening back mirror electric heating system, rear window electric heating system.
Electronic control unit 20 also for obtaining air-distributor pressure signal, calculates the sea level elevation residing for this vehicle accordingly; And according to the degree of vacuum of this vehicle vacuum servo-unit and the sea level elevation that calculates, whether both judgements mate, if do not mate, then carry out recording and revise the degree of vacuum of vehicle vacuum servo-unit and the matching relationship of sea level elevation for the later stage.
Electronic control unit 20 is also for drawing the degree of vacuum of this air-distributor pressure according to air-distributor pressure calculated signals, judge that the difference of the degree of vacuum of air-distributor pressure and the degree of vacuum of vehicle vacuum servo-unit is whether in the scope preset, if not in this scope preset, then give the alarm.
In order to promote the safety of driving further, this electronic control unit 20 also for closing in vehicle load, and when this degree of vacuum is less than this first degree of vacuum, if automobile gear level is in P shelves or N shelves, gives the alarm.
Referring to Fig. 5, Fig. 6, the present invention also provides a kind of Matching and modification method of vehicle vacuum booster vacuum degree, comprising: the degree of vacuum of S1, acquisition vehicle vacuum servo-unit, and judges whether this degree of vacuum is less than the first default degree of vacuum; S2, when this degree of vacuum is less than the first default degree of vacuum, then enter load control logic or idle-speed control logic; Wherein this load control logic comprises step: A1, acquisition vehicle speed signal and accelerator pedal signal; A2, when the speed of a motor vehicle is in default number range and this Das Gaspedal is not operated, then close vehicle load; This idle-speed control logic comprises step: B1, acquisition automobile gear level signal; B2, when automobile gear level is not in P shelves or N shelves state, promote engine idle rotational.
Specifically, first, electronic control unit 20 obtains the degree of vacuum of vehicle vacuum servo-unit, then judges whether degree of vacuum is less than the first default degree of vacuum, such as, be 20kpa, if be not less than 20kpa, then stops; If be less than 20kpa, then enter load control logic or idle-speed control logic.
If enter load control logic, then electronic control unit 20 obtains vehicle speed signal and accelerator pedal signal again, now, if the speed of a motor vehicle is in default number range, in the present embodiment, the number range preset is 0.5km/h ~ 40km/h, and Das Gaspedal is not operated, and namely vehicle is in idling mode, then close load, such as close vehicle air conditioning, back mirror electric heating system, rear window electric heating system etc., wherein again to close vehicle air conditioning, effect is the most remarkable.
If enter idle-speed control logic, then electronic control unit 20 obtains automobile gear level signal again, judges whether vehicle is in P shelves or N shelves, if vehicle is not in P shelves or N shelves, then promotes engine idle rotational with the degree of vacuum of this lifting vehicle vacuum booster; If vehicle is in P shelves or N shelves, then report to the police, but before warning, need first to determine that vehicle load be such as air-conditioning is be in closed condition.
In order to promote the traveling comfort of driving further, step can be added in step sl: obtain air-distributor pressure signal, and calculate the sea level elevation residing for this vehicle accordingly; When this sea level elevation is higher than the minimum sea level elevation preset, just enter step S2.Its idiographic flow please refer to Fig. 7, and first, electronic control unit 20 obtains the degree of vacuum of vehicle vacuum servo-unit, then judges whether degree of vacuum is less than the first default degree of vacuum, such as, be 20kpa, if be not less than 20kpa, then stops; If be less than 20kpa, then continue and obtain air-distributor pressure signal, and calculate the sea level elevation residing for this vehicle accordingly; When sea level elevation is such as 2000 meters higher than the minimum sea level elevation preset, then enters load control logic or idle-speed control logic, otherwise just stop.Due in the present embodiment, as long as long as sea level elevation is higher than 2000 meters, first degree of vacuum of its correspondence is exactly 20kpa, so now judge sea level elevation whether higher than the minimum sea level elevation preset and judge whether degree of vacuum is less than the first default degree of vacuum and does not have precedence relationship.
When adopting the Matching and modification method of vehicle vacuum booster vacuum degree as shown in Figure 7, sea level elevation can be divided between several Altitude Regions as shown in table 1 below, and according to concrete braking requirement (namely during car brakeing to the demand of degree of vacuum) to setting different vacuum booster vacuum ranges between different Altitude Regions, to play the performance of motor vehicle braking system to greatest extent.Because the performance of different automobile types driving engine is different, the degree of vacuum that can provide is also different, thus also different for vacuum level requirement during braking.Contriver finds through lot of experiments, the degree of vacuum that most national engine sets different altitude height corresponding according to table 1 is verified, brake system can adapt to the demand of High aititude to greatest extent, and then carries out according to method provided by the invention operating the problem that can solve high altitude region brake system vacuum degree deficiency.Certainly, for imported engine, also can reference table 1 and according to actual conditions setting sea level elevation scope and booster vacuum degree lock value scope corresponding relation (through limited number of time test can find suitable corresponding relation).
Lower limit in table 1 below in vehicle vacuum booster vacuum degree scope is this first degree of vacuum in this Altitude Region, and its higher limit is then the second degree of vacuum, and as can be seen here, the second degree of vacuum is greater than the first degree of vacuum.
Table 1
| Between Altitude Region | Degree of vacuum is interval | First degree of vacuum | Second degree of vacuum |
| 1000m～2000m | 40kpa～50kpa | 40kpa | 50kpa |
| 2000m～3500m | 20kpa～40kpa | 20kpa | 40kpa |
| 3500m～5000m | 10kpa～20kpa | 10kpa | 20kpa |
Certainly, also more than minimum height above sea level, just 20kpa ~ 40kpa can be set to by unified for degree of vacuum interval, and be no longer divided between multiple Altitude Region, because in the present embodiment, be can not load control logic in triggered step S2 or idle-speed control logic below minimum height above sea level.
In order to increase the safety of driving, step can also be added in step sl: the degree of vacuum drawing this air-distributor pressure according to air-distributor pressure calculated signals, judge that the difference of the degree of vacuum of this air-distributor pressure and the degree of vacuum of this vehicle vacuum servo-unit is whether in the scope preset, if not in this scope preset, then give the alarm, to get rid of the fault (such as pipeline is damaged) of booster system in advance.Simultaneously can also according to the degree of vacuum of this vehicle vacuum servo-unit obtained and this sea level elevation calculated, whether both judgements mate, if do not mate, then carry out record, revise the degree of vacuum of vehicle vacuum servo-unit and the matching relationship of sea level elevation for the later stage.
Referring again to Fig. 8, in the present embodiment, to trigger brake pedal signal for initial conditions, then electronic control unit 20 obtains the degree of vacuum of vehicle vacuum servo-unit, continue and obtain air-distributor pressure signal, and calculate the degree of vacuum of induction maniflod, then the difference of the degree of vacuum of air-distributor pressure and the degree of vacuum of this vehicle vacuum servo-unit is judged whether in the scope preset, such as 15kpa, if this difference is greater than 15kpa, then report to the police, because generally the Average True reciprocal of duty cycle of servo-unit all can be higher than manifold vacuum, during engine operation, when the instantaneous degree of vacuum of induction maniflod is higher than booster vacuum, capital makes booster vacuum degree raise, if within a certain period of time, such as 5S, booster vacuum degree is more much lower than manifold vacuum, such as 15kpa, then illustrate that pipeline has damaged gas leakage or vacuum booster to have gas leakage, check valve cannot be opened, therefore need to report to the police.
If the difference of the degree of vacuum of the degree of vacuum of air-distributor pressure and this vehicle vacuum servo-unit in the scope preset, then draws the sea level elevation residing for this vehicle according to air-distributor pressure calculated signals again; Further according to the degree of vacuum of the vehicle vacuum servo-unit obtained with the corresponding diagram of degree of vacuum (being example as shown in Table 1) between Altitude Region and the sea level elevation that calculates, whether both judgements mate, if do not mate, then carry out record, the result of record may be used for the degree of vacuum of later stage correction vehicle vacuum servo-unit and the matching relationship of sea level elevation; Record finishes fruit, or after determining that the degree of vacuum of vehicle vacuum servo-unit mate with height above sea level, then judges that whether sea level elevation is such as 2000 meters higher than default minimum sea level elevation, if not, with regard to termination; If so, just then judge whether degree of vacuum is less than the first default degree of vacuum.Now, need vacuum ranges corresponding between the Altitude Region of sea level elevation residing for reference vehicle, as shown in Table 1, if now sea level elevation residing for vehicle is 2500 meters, then above-mentioned first degree of vacuum is exactly 20kpa, if be less than 20kpa, then enter load control logic or idle-speed control logic, otherwise just stop.In the present embodiment, due to the first degree of vacuum that different sea level elevations possibility is corresponding different, so generally take first to judge sea level elevation, then judge whether degree of vacuum is less than the method for the first default degree of vacuum.
Referring again to the step schematic diagram that Fig. 9, Fig. 9 are load control logic of the present invention.In the present embodiment, this load control logic, except steps A 1, A2, also comprises steps A 3, the degree of vacuum obtaining vehicle vacuum servo-unit, vehicle speed signal and accelerator pedal signal; A4, when this degree of vacuum is greater than the second default degree of vacuum, such as, during 24kpa, the speed of a motor vehicle is in default number range, and when this Das Gaspedal is not operated, exits this load control logic, and wherein this second degree of vacuum is greater than this first degree of vacuum; When sea level elevation is divided between several Altitude Regions as shown in Table 1, this second degree of vacuum is exactly the higher limit in degree of vacuum interval corresponding between each Altitude Region.
Please refer to Figure 10, Figure 10 is the step schematic diagram of idle-speed control logic of the present invention.In the present embodiment, idle-speed control logic also comprises step: the degree of vacuum of B3, acquisition vehicle vacuum servo-unit; B4, be less than this second degree of vacuum when this degree of vacuum, such as, during 24kpa, continue to promote this engine idle rotational, until this degree of vacuum is greater than this second degree of vacuum.
When due to vacuum degree deficiency, if directly enter idle-speed control logic, affect to fuel economy, in order to solve the problem, can be specially by setting procedure S2: when this degree of vacuum is less than the first default degree of vacuum, be introduced into this load control logic, now: if this vehicle load is in opening, then close this vehicle load, the degree of vacuum of vehicle vacuum servo-unit is then obtained, if this degree of vacuum is still less than this first degree of vacuum, then enter idle-speed control logic.If this vehicle load is in closed condition, then enter this idle-speed control logic.
In the specific implementation, can take as illustrated in flow chart figure 11, to trigger brake pedal signal for initial conditions, then obtain air-distributor pressure signal, and calculate the sea level elevation residing for this vehicle accordingly; And judge that whether sea level elevation is such as 2000 meters higher than the minimum sea level elevation preset, if not, then stop; If so, then then obtain the degree of vacuum of vehicle vacuum servo-unit, judge whether degree of vacuum is less than the first default degree of vacuum, such as, be 20kpa, if be not less than 20kpa, then stops.
If degree of vacuum is less than the first default degree of vacuum, then enter load control logic, first, obtain vehicle speed signal and accelerator pedal signal, now, if the speed of a motor vehicle is in default number range, in the present embodiment, the number range preset is 0.5km/h ~ 40km/h, and Das Gaspedal is not operated, namely vehicle is in idling mode, and due in the present embodiment, above-mentioned vehicle load is air-conditioning, so, need then to judge whether air-conditioning is in opening, if air-conditioning is in opening, then close air-conditioning; If air-conditioning is in closed condition, owing to having judged that this degree of vacuum was less than the first default degree of vacuum before, so, now to directly enter idle-speed control logic.
If air-conditioning is pent when opening, after then closing air-conditioning, also need again to obtain the degree of vacuum of vehicle vacuum servo-unit, vehicle speed signal and accelerator pedal signal, then judge whether degree of vacuum is greater than the second degree of vacuum, whether the speed of a motor vehicle is in the scope preset, whether Das Gaspedal is operated, as long as of meeting in above-mentioned three just exits load control logic; The speed of a motor vehicle and Das Gaspedal can be no longer judged when that is exiting, then directly exit as long as degree of vacuum is greater than the second degree of vacuum, also only vehicle speed signal can be obtained, as long as the speed of a motor vehicle does not also directly exit in the scope preset, also only can obtain accelerator pedal signal, just directly exit as long as Das Gaspedal is operated.If do not meet the above-mentioned condition exiting load control logic, then then judge whether this degree of vacuum is less than the first default degree of vacuum, if so, then enter idle-speed control logic.
After entering idle-speed control logic, electronic control unit 20 obtains automobile gear level signal again, judge whether vehicle is in P shelves or N shelves, if vehicle is not in P shelves or N shelves, then promoting engine idle rotational with the degree of vacuum of this lifting vehicle vacuum booster, when promoting, engine idle rotational can be promoted 40rpm ~ 170rpm at every turn, such as 50rpm, and then the degree of vacuum obtaining vehicle vacuum servo-unit; When this degree of vacuum is less than the second degree of vacuum, continues to promote this engine idle rotational, such as, promote 50rpm, until this degree of vacuum is greater than the second degree of vacuum, when degree of vacuum is greater than the second degree of vacuum, just can exit idle-speed control logic.
It should be noted that, when judging whether vehicle is in P shelves or N shelves, if, then need to send warning, because now air-conditioning is closed, and gear is when being in N shelves or P shelves, degree of vacuum is now be not less than the first default degree of vacuum in principle, once occur that problem needs maintenance investigation has appearred in illustrative system.
Finally, please refer to Figure 12, Figure 12 is alarm control schematic flow sheet of the present invention.In the present invention, in Fig. 7 and Figure 10, all refer to warning, in order to promote drive safety, the frequency can be fixed and carry out detecting so that and alarm.Specifically, first, the fixing frequency obtains vehicle vacuum booster vacuum degree, air-distributor pressure signal, automobile gear level signal, then judges that the difference of the degree of vacuum of air-distributor pressure and the degree of vacuum of vehicle vacuum servo-unit is whether in default scope, such as, be less than 15kpa; If so, detection next time is just waited for; If not, then need to carry out warning and storage failure code.
Can also judge whether degree of vacuum is less than the first default degree of vacuum simultaneously, now need first to determine that air-conditioning is closed, automobile gear level is at N or P shelves, that is, when air-conditioning is in closed condition, automobile gear level is at N or P shelves, and degree of vacuum is less than the first default degree of vacuum simultaneously, just carries out warning and storage failure code; Otherwise, wait for detection next time.
The invention provides a kind of Matching and modification method and system thereof of vehicle vacuum booster vacuum degree, when vehicle vacuum booster vacuum degree is lower, by closing load or improving the degree of vacuum that engine idle rotational carrys out lifting vehicle vacuum booster, thus increase power output, make rate of braking higher, increase the safety of driving; In order to increase the traveling comfort of driving, minimum sea level elevation can be added as limiting condition, only when higher than minimum sea level elevation, just can by closing load or improving the degree of vacuum that engine idle rotational carrys out lifting vehicle vacuum booster; In order to take into account the problem of fuel economy simultaneously, when vehicle vacuum booster vacuum degree is lower, the degree of vacuum of lifting vehicle vacuum booster first can be carried out by closing load, if after closedown load, degree of vacuum or low, then the degree of vacuum carrying out lifting vehicle vacuum booster by improving engine idle rotational.The present invention is in order to improve the safety of driving further, more add alarm control flow process, when whether the difference of the degree of vacuum of air-distributor pressure and the degree of vacuum of vehicle vacuum servo-unit is in the scope preset, or when air-conditioning is in closed condition, automobile gear level is at N or P shelves, all warning can be sent, with reminding user when degree of vacuum is less than the first default degree of vacuum simultaneously.
Above with reference to the accompanying drawings of the preferred embodiments of the present invention, those skilled in the art do not depart from the scope and spirit of the present invention, and multiple flexible program can be had to realize the present invention.For example, to illustrate as the part of an embodiment or the feature that describes can be used for another embodiment to obtain another embodiment.These are only the better feasible embodiment of the present invention, not thereby limit to interest field of the present invention that the equivalence change that all utilizations specification sheets of the present invention and accompanying drawing content are done all is contained within interest field of the present invention.
Claims (15)
1. a Matching and modification method for vehicle vacuum booster vacuum degree, is characterized in that, comprising:
The degree of vacuum of S1, acquisition vehicle vacuum servo-unit, and judge whether described degree of vacuum is less than the first default degree of vacuum;
S2, when described degree of vacuum is less than the first default degree of vacuum, then enter load control logic or idle-speed control logic;
Wherein said load control logic comprises step: A1, acquisition vehicle speed signal and accelerator pedal signal; A2, when the speed of a motor vehicle is in default number range and Das Gaspedal is not operated, close vehicle load;
Described idle-speed control logic comprises step: B1, acquisition automobile gear level signal; B2, when automobile gear level is not in P shelves or N shelves state, promote engine idle rotational.
2. the Matching and modification method of vehicle vacuum booster vacuum degree according to claim 1, it is characterized in that, also step is comprised: obtain air-distributor pressure signal in described step S1, and the sea level elevation calculated accordingly residing for described vehicle, when described sea level elevation is higher than the minimum sea level elevation preset, enter described step S2.
3. the Matching and modification method of vehicle vacuum booster vacuum degree according to claim 2, it is characterized in that, all sea level elevations are divided between several Altitude Region, according to braking requirement to setting different vehicle vacuum booster vacuum degree scopes between different Altitude Regions, the lower limit in wherein said vehicle vacuum booster vacuum degree scope is described first degree of vacuum in described Altitude Region.
4. the Matching and modification method of vehicle vacuum booster vacuum degree according to claim 3, it is characterized in that, also comprise in described step S1: according to degree of vacuum and the described sea level elevation that calculates of the described vehicle vacuum servo-unit obtained, whether both judgements mate, if do not mate, then carry out record.
5. the Matching and modification method of vehicle vacuum booster vacuum degree according to claim 2, it is characterized in that, also step is comprised: the degree of vacuum drawing described air-distributor pressure according to air-distributor pressure calculated signals in described step S1, judge that the difference of the degree of vacuum of described air-distributor pressure and the degree of vacuum of described vehicle vacuum servo-unit is whether in the scope preset, if not in described default scope, then give the alarm.
6. the Matching and modification method of described vehicle vacuum booster vacuum degree according to claim 1, is characterized in that, in described step S2, when described degree of vacuum is less than the first default degree of vacuum, be introduced into described load control logic, now:
If described vehicle load is in opening, then close described vehicle load, then obtain the degree of vacuum of vehicle vacuum servo-unit, if described degree of vacuum is still less than described first degree of vacuum, then enter idle-speed control logic;
If described vehicle load is in closed condition, then enter described idle-speed control logic.
7. according to the Matching and modification method of the arbitrary vehicle vacuum booster vacuum degree described in claim 1 to 6, it is characterized in that, described load control logic also comprises step: A3, the degree of vacuum obtaining vehicle vacuum servo-unit, vehicle speed signal and accelerator pedal signal; If the described degree of vacuum of A4 is greater than the second default degree of vacuum, or the speed of a motor vehicle is in default number range, or described Das Gaspedal is not operated, then exit described load control logic, wherein said second degree of vacuum is greater than described first degree of vacuum;
Described idle-speed control logic also comprises step: the degree of vacuum of B3, acquisition vehicle vacuum servo-unit; B4, when described degree of vacuum is less than described second degree of vacuum, continue promote described engine idle rotational, until described degree of vacuum is greater than described second degree of vacuum.
8. according to the Matching and modification method of the arbitrary described vehicle vacuum booster vacuum degree of claim 1 to 6, it is characterized in that, also comprise in the step B2 of described idle-speed control logic: close in described vehicle load, and described degree of vacuum is when being less than described first degree of vacuum, if automobile gear level is in P shelves or N shelves, then give the alarm.
9., according to the Matching and modification method of the arbitrary described vehicle vacuum booster vacuum degree of claim 1 to 6, it is characterized in that, described vehicle load comprises at least one item in air-conditioning, back mirror electric heating system, rear window electric heating system.
10. a Matching and modification system for vehicle vacuum booster vacuum degree, is characterized in that, comprising:
Sensor assembly, for obtaining degree of vacuum, vehicle speed signal, the accelerator pedal signal of vehicle vacuum servo-unit;
Electronic control unit, for receiving the signal that automobile gear level signal and described sensor assembly send, and judges whether described degree of vacuum is less than the first default degree of vacuum; When described degree of vacuum is less than the first default degree of vacuum, vehicle speed is in default number range, and when described Das Gaspedal is not operated, controls to close vehicle load; Or when described degree of vacuum is less than the first default degree of vacuum, and when automobile gear level is not in P shelves or N shelves state, control to promote engine idle rotational.
The Matching and modification system of 11. vehicle vacuum booster vacuum degree according to claim 10, is characterized in that, also comprise gearbox control, be connected with described electronic control unit, obtains automobile gear level signal for making described electronic control unit; Described sensor assembly comprises the vacuum sensor for obtaining vehicle vacuum booster vacuum degree, for obtaining the car speed sensor of vehicle speed signal, for obtaining the pedal sensor of accelerator pedal signal.
The Matching and modification system of 12. vehicle vacuum booster vacuum degree according to claim 10, is characterized in that, also comprise compressor module, be connected with described electronic control unit, for closing according to the control of described electronic control unit or opening air-conditioning.
The Matching and modification system of 13. vehicle vacuum booster vacuum degree according to claim 10, it is characterized in that, also comprise electro heat module, be connected with described electronic control unit, for closing according to the control of described electronic control unit or opening back mirror electric heating system, rear window electric heating system.
The Matching and modification system of 14. vehicle vacuum booster vacuum degree according to claim 10, it is characterized in that, described electronic control unit also receives air-distributor pressure signal, and:
Calculate the sea level elevation residing for vehicle accordingly; Simultaneously according to the degree of vacuum of described vehicle vacuum servo-unit and the described sea level elevation that calculates, whether both judgements mate, if do not mate, then carry out record; Or
Calculate the degree of vacuum of described air-distributor pressure accordingly, judge that the difference of the degree of vacuum of described air-distributor pressure and the degree of vacuum of described vehicle vacuum servo-unit is whether in the scope preset, if not in described default scope, then give the alarm.
The Matching and modification system of 15. vehicle vacuum booster vacuum degree according to claim 10, it is characterized in that, described electronic control unit is also closed in described vehicle load, and described degree of vacuum is when being less than described first degree of vacuum, when automobile gear level is in P shelves or N shelves, give the alarm.
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