CN100462264C - Automobile fuel-saving prompting method - Google Patents
Automobile fuel-saving prompting method Download PDFInfo
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- CN100462264C CN100462264C CNB2007100512283A CN200710051228A CN100462264C CN 100462264 C CN100462264 C CN 100462264C CN B2007100512283 A CNB2007100512283 A CN B2007100512283A CN 200710051228 A CN200710051228 A CN 200710051228A CN 100462264 C CN100462264 C CN 100462264C
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Abstract
The invention provides a vehicle fuel-saving prompting method, wherein an engine rotating speed and vehicle speed calculating module and various databases are stored in a computer; collecting engine speed and vehicle speed pulse to calculate speed V0And vehicle speed V1Will V0、V1Respectively storing in RAM; from V0And V1Calculating gear ratio B, looking up corresponding standard gear ratio X through gear look-up table database, and looking up corresponding gear D1D is1Stored in RAM; from the measured speed V1Searching corresponding standard vehicle speed V in vehicle speed zone bit lookup table database2Further searching a corresponding speed zone bit Z, wherein the selected Z is changed from 0 to 1; the vehicle speed mark position Z in the corresponding vehicle speed and optional gear comparison table database is also changed from 0 to 1, so that the gear value D is found2(ii) a Actually measured gear D in gear lookup table database1D searched in table database by comparing vehicle speed with optional gear2Comparing the middle and highest gears; d1＝D2Not to suggest, D1≠D2Then, the interrupt signal is detected, if there is no interrupt signal, D1＜D2And outputting a gear-up prompt.
Description
Technical field
The present invention relates to a kind of prompt method for vehicle to save oil, be by calculate work at present gear value and optional gear behind perception driving engine work at present rotating speed and the car load speed of operation and judge car load whether constant-speed driving and work at present gear whether be economic gear, inform that chaufeur shifts up operation to realize the method for fuel economy.
Background technology
At present, still do not have automobile-used fuel-economizing prompting device on the vehicle, when the driver fails the command economy gear, provide the sound or voice, prompting or prompting driver make the operation that shifts up, and make driving engine in the operation of the economic zone of relatively fuel-economizing.
Summary of the invention
The purpose of this invention is to provide a kind of prompt method for vehicle to save oil, when the driver fails the command economy gear, make the operation that shifts up with clear and melodious and gentle female voice prompting driver, to realize fuel economy.
Technical scheme of the present invention: prompt method for vehicle to save oil of the present invention comprises having engine speed and speed of a motor vehicle computing module in the computing machine, also deposits following three data banks in its computing machine in:
A) speed of a motor vehicle and optional gear comparing watch (1) data bank in the economic work district that can reflect this driving engine that sets up according to the driving engine curve that minimum oil consumption obtains under different rotating speeds and different gears;
B) set up one and the speed of a motor vehicle and optional gear comparing watch (1) data bank cooresponding speed of a motor vehicle zone bit question blank (2) data bank, speed of a motor vehicle zone bit question blank (2) data bank is listed actual measurement vehicle velocity V 1, standard vehicle velocity V 2, speed of a motor vehicle zone bit Z corresponding relation, as the gating pointer in each standard speed of a motor vehicle district;
C) set up a gear question blank (3) data bank, storage gear D in gear question blank (3) data bank
1With the corresponding relation of standard converter speed ratio X, so that the converter speed ratio B that is calculated by actual measurement searches cooresponding standard converter speed ratio X, and then the gear value D1 that finds a job;
V1: according to engine speed by calculating the speed of a motor vehicle;
V2: be the segmentation speed of a motor vehicle of ECU foundation;
V
0: the mean engine crankshaft rotating speed;
D
1: the work gear of change speed gear box when referring to vehicle ';
D
2: the optional gear that refers to change speed gear box under certain speed of a motor vehicle;
X: refer to each grade speed ratio that the change speed gear box design is determined;
B: calculate the change speed gear box speed ratio that draws according to the relation between the speed of a motor vehicle and the engine speed;
Concrete steps are as follows:
(3) gather engine speed and vehicle speed pulse and calculation engine rotating speed V
0, and vehicle velocity V
1, and with V
0, V
1Leave two data fields of appointment among the RAM respectively in;
(4) according to actual measurement engine speed V
0And vehicle velocity V
1Calculate converter speed ratio B, by gear question blank (3) data bank, search cooresponding standard converter speed ratio X, and then search cooresponding gear D
1, and with the D that chooses
1Be kept at the data field of appointment among the RAM;
(3) according to the actual measurement vehicle velocity V
1Search cooresponding standard vehicle velocity V in speed of a motor vehicle zone bit question blank (2) data bank
2, and then searching cooresponding speed of a motor vehicle zone bit Z, the Z that chooses becomes 1 by 0;
(4) speed of a motor vehicle zone bit Z in the cooresponding speed of a motor vehicle and optional gear comparing watch (1) data bank also becomes 1 by 0, and finds the optional gear value of standard D thus
2
(5) with gear D in gear question blank (3) data bank
1With find standard file place value D in the speed of a motor vehicle and optional gear comparing watch (1) data bank
2In the top-gear position, promptly economic gear compares;
If D
1=D
2Expression work gear conforms to economic gear, does not need the output prompting, and former data are cancelled, and carry out said process again;
If D
1≠ D
2The time, detecting interrupt signal again, interrupt signal comprises that throw-out-of clutch, Das Gaspedal lift and step on the brake pedal signal, if interrupt signal is arranged, represents that then vehicle in speed change or gearshift procedure, need not point out, former data are cancelled to return and are read new data;
D
1≠ D
2The time, if there is not interrupt signal, then export cue;
D
1＜D
2, computing machine output " shift-up " prompting;
D
1=D
2, computing machine is not exported voice suggestion.
Described prompt method for vehicle to save oil, at the uniform velocity concrete steps are as follows to judge the speed of a motor vehicle:
1) vehicle speed pulse signal number n is counted, writing n+1=30 pulse all over is one group, writes down the time span t1 of 30 pulses simultaneously and is kept at the data field of appointment among the RAM;
2) after the first group pulse time t1 preserves, carry out reading of second group of 30 vehicle speed pulse signal and time t2 again;
3) calculate t1/t2=λ ratio, when λ changes within 1 ± 3% scope, just: 1-3%＜λ＜1+3% is considered as at the uniform velocity in the interval, and as vehicle velocity V
1Whether stable judgment value as λ＜1-3% or λ〉during 1+3%, the expression speed wobble need return and read new data again, and former data are cancelled.
1 speech trigger signal of the every output of described prompt method for vehicle to save oil computing machine, continuous 2 voice suggestions of sound circuit, computing machine automatic time delay 3 seconds just allows to point out next time.
Described prompt method for vehicle to save oil, between interruption and voice suggestion time delay, data acquisition is not interrupted, and new data replaces old data, and old data are overflowed.
Described prompt method for vehicle to save oil, B value are got its computing value B ± (3%～5%) B, with this coverage criteria converter speed ratio X, with the convenient X that seeks.
The present invention has following characteristics and advantage:
Whether 1, the fuel-economizing prompting device only uses on the vehicle of diesel oil that is equipped with MT or half AT or gasoline, only adopt economic gear to point out to chaufeur under stable (constant speed) driving cycle.
2, the audible indication that sends of fuel-economizing prompting device must be clear and melodious and gentle female voice, consideration is because of the speed-raising general with automobile that improve constantly along with domestic road quality like this, the driver many places are in attention high concentration state, tend to cause kopiopia, if adopt other prompting (as optical signal, vibration etc.) not only can give the very big psychological pressure of driver, and suggestion content is also often so comprehensive not as the sound prompting.
3, micro controller system decapacitation perception engine speed, the speed of a motor vehicle and judge whether current gear is outside the economic gear can also identify vehicle and adopt special operation conditions such as starting, braking (comprising emergency braking), the acceleration of overtaking other vehicles.If vehicle is in these non-constant-speed driving operating modes, micro controller system is not made judgement, does not send any instruction; Otherwise whether the judgment task gear is economic gear, and the prompting driver does the operation that shifts up.
Description of drawings
Fig. 1 is the speed of a motor vehicle and optional gear comparing watch (1) data bank;
Fig. 2 is speed of a motor vehicle zone bit question blank (a 2) data bank;
Fig. 3 is gear question blank (a 3) data bank;
Fig. 4 is schematic circuit diagram;
Fig. 5 is the computer operation diagram of circuit;
Fig. 6 is the match condition figure of the vehicle constant-speed driving resistance conversion of six gears for the oil consumption MAP figure of effective curve of loads of exporting of driving engine and driving engine.
The specific embodiment
One. the principle of work scheme
1. the present invention's technology that uses a computer is gathered engine speed impulse singla and vehicle speed pulse signal in real time, and signal is carried out shaping, isolates and anti-interference process.Gear is judged and must evenly carried out under the speed of a motor vehicle.
2. gather the rotational speed pulse signal number n of driving engine revolution
0And time t
0(s), according to formula V
0=60/t
0(r/min), calculate engine speed V
0
3. gather the vehicle speed pulse signal n of wheel revolution
1And time t (s).According to formula V
1=3.6*2 π R/t and known vehicle wheel roll radius R (m) calculate vehicle velocity V
1(km/h).
4. according to engine speed V
0And vehicle velocity V
1Calculate the converter speed ratio B of change speed gear box, the standard converter speed ratio X in B and the table (3) is compared, find out cooresponding work gear D1.Converter speed ratio B value B ± (3%～5%) B that calculates is to cover and conveniently to find out X.
5. with vehicle velocity V
1With the standard vehicle speed range V in speed of a motor vehicle zone bit question blank (2) data bank
2Compare, find out speed of a motor vehicle sign Z.The state of selected Z becomes 1 by 0, and points to the speed of a motor vehicle and optional gear comparing watch (1) data bank.Thereby the several cooresponding gear D in the speed of a motor vehicle of finding out and optional gear comparing watch (1) data bank under this rotating speed
2
6. vehicle speed pulse is carried out continuous sampling, read two groups at every turn, get 30 pulses and measure and preserve the time width t1 and the t2 of 30 pulses for every group.
7. according to formula t1/t2=λ, the value of λ is limited in 1 ± 3% scope is considered as at the uniform velocity, just allow to carry out gear and judge.Otherwise read new t1 and t2 again.
8. the speed of a motor vehicle zone bit Z that chooses points to the gear data query district in the speed of a motor vehicle and optional gear comparing watch (1) data bank, finds out gear D
2With D1 (work gear) and the D that chooses
2Middle top-gear position (being economic gear) compares.Less than D
2Output " shift-up " signal.
9. when driving, when carrying out gear shift (stepping on power-transfer clutch), brake and unclamping the operation of throttle, send interrupt signal to computing machine.And not when stabilizing speed, computing machine stops to send signal to sound circuit.
Two. circuit embodiment Fig. 4:
1. the trivial ACC shelves of igniting are connected the 12V power supply on the car, and mu balanced circuit 7809 output 9V are to 40106 and the 4N35 power supply.
2.7809 output simultaneously to the power supply of 7805 mu balanced circuits, 7805 output 5V voltages are to micro controller system and sound circuit power supply.
3. circuit is the shared grounding point with the vehicle body.
4. engine rotational speed signal is sent into the input end of U1, and vehicle speed signal is sent into the input end of U2.U1 and U2 are cmos circuits, and operating voltage can reach 18V.The 40106th, the Si Mite phase inverter has disturbance rejection and anti-shake effect preferably to incoming signal.
5.U1 and the output branch of U2 is clipped to 1 end of U3 and U4, pull-up resistor R1 and R2 provide power supply to U3 and U4.
6. when U1 and U2 were output as low level, U3 and U4 did not have received current, and U3 and U4 are output as high-impedance state.When U1 and U2 were output as high level, U3 and U4 had received current.U3 and U4 are output as low resistive state.
7.U3 and U4 plays isolation, level conversion, level shaping and disturbance rejection effect.3 pin of U3 and U4 output to 2 pin 3.0 and 3 pin, 3.1 input ports of micro controller system respectively.
8. along with the waveform of incoming signal, the square-wave signal that obtains the 5-0V high-low level at the P3.0 and the P3.1 input port of AT89C2051 micro controller system.
9.AT89C2051 4,5 pin of micro controller system connect the 6M crystal oscillating circuit, for micro controller system provides clock signal.
10.AT89C2051 the 18 pin P1.6 and the 19 pin P1.7 of micro controller system are the speech trigger delivery ports.P1.6 output low level when the computing machine no-output.When output was arranged, P1.6 exported high level.
11. the P1.6 delivery port correspondence of micro controller system is received the S1 of HY8010 speech IC and is triggered port, when this port is changed to high level is to trigger HY8010 output " shift-up " voice signal.
12.D1, D2, D3 receive throttle, braking and clutch pedal switch respectively.Braking and pedal of clutch is stepped on or Das Gaspedal switch closure when lifting makes AT89C2051 the 6th pin P3.2 mouth become low level by high level, imports external interrupt signal.This moment, the micro controller system internal processes interrupted the operation of voice output program.
13.HY8010 the IRP port of speech IC is middle fracture, behind 2 energizing signal of computing machine output, the P1.3 port of computing machine output high level interrupt signal, after 3 seconds of computer-internal timing, interrupt signal is cancelled and is allowed P1.6 to export energizing signal once more.
14.HY8010 the OUT1 port of speech IC is an Audio output port, through Q1 transistor driving loud speaker sounding.
15.HY8010 the OSC port of speech IC is to connect to draw the resistance port.
16. procedure quantity less than 1K, can be used the AT89C1051 micro controller system, uses the AT89C2051 micro controller system greater than 1K less than 2K.Use the AT89C51 micro controller system greater than 2K less than 4K.
Micro controller system is the core of whole fuel-economizing prompting device, micro controller system is handled engine speed, the vehicle speed signal accepting to come, calculate current work gear and optional gear, and judge car load whether constant-speed driving and work at present gear whether be economic gear, inform with clear and melodious and gentle female voice whether chaufeur shifts up; Simultaneously to making analysis from the signal of Das Gaspedal, brake pedal and pedal of clutch, to throw-out-of clutch, throttle return zero, brake pedal is stepped on etc., and operating mode is not carried out voice suggestion.
Determining of economic gear of the present invention is that foundation is with the high-grade fuel-efficient principle of the speed of a motor vehicle, following casehistory: Fig. 6 is the match condition of the vehicle constant-speed driving resistance conversion of six gears for the oil consumption MAP figure of effective curve of loads of exporting of driving engine and driving engine, as when the speed of a motor vehicle 50km/h, available gears has 3, is respectively i
4, i
5And i
6Equate the principle that resistance to motion power equates according to the speed of a motor vehicle, for manual, can think that the efficient of each grade equates, just think that so also the effective power that driving engine sends equates, 3 available gears according to gear just respectively corresponding three operation point A ', B ', C ', they are on the equipower line of 32.5Kw.And there is the following fact: b in the rate of fuel consumption b of three operation points at this moment
A '＜b
B '＜b
C ', under the promptly identical speed of a motor vehicle, gear is high more fuel-efficient more.
There are engine speed and speed of a motor vehicle computing module and following three data banks in the computing machine:
Fig. 1 is the speed of a motor vehicle and optional gear comparing watch (1) data bank in the economic work district that can reflect this driving engine that sets up according to the driving engine curve that minimum oil consumption obtains under different rotating speeds and different gears; According to the speed of a motor vehicle under the characteristic performance curve of Fig. 6 driving engine and each grade, set up a driving engine obtains the peak output scope with minimum oil consumption under different rotating speeds and different gears curve.The data bank of setting up with this diagram of curves should be the economic work district that can reflect this driving engine.Computing machine finds gear D according to the vehicle speed data of actual measurement in the speed of a motor vehicle and optional gear comparing watch (1) data bank
2In cooresponding shelves.Wherein high tap position is most economical mode of operation.Z (Z
1～Z
7) be the strobe marker position.
Fig. 2 is one and the speed of a motor vehicle and optional gear comparing watch (1) data bank cooresponding speed of a motor vehicle zone bit question blank (2) data bank, and speed of a motor vehicle zone bit question blank (2) data bank is listed the actual measurement vehicle velocity V
1, the standard vehicle velocity V
2, Z among the speed of a motor vehicle zone bit Z
1～Z
7Corresponding relation, as the gating pointer in each standard speed of a motor vehicle district; In order to cooperate the work of the speed of a motor vehicle and optional gear comparing watch (1) data bank, in speed of a motor vehicle zone bit question blank (2) data bank, preestablish the standard vehicle velocity V
2, with the actual measurement vehicle velocity V
1Searching standard speed of a motor vehicle district V
2, the zone bit Z in this standard speed of a motor vehicle district becomes 1 by 0 after finding, and directly points to the gear of Z under this speed of a motor vehicle in the speed of a motor vehicle and optional gear comparing watch (1) data bank.
Fig. 3 is a gear question blank (a 3) data bank, storage gear D in gear question blank (3) data bank
1With standard converter speed ratio X (X
2～X
8) corresponding relation so that search cooresponding standard converter speed ratio X, and then find gear value D by the converter speed ratio B that calculates
1(work gear);
In order whether to find out vehicle, set up a gear question blank (3) data bank rationally moving under the gear.In this gear question blank (3) data bank, preestablish the converter speed ratio X under the standard gear, with surveying the converter speed ratio B that calculates
1～B
7Search cooresponding standard converter speed ratio X
2～X
8, just can find gear value D
1The value that calculates is B, gets B ± (3%～5%) B and covers X, with the convenient X that seeks.
According to different automobile types, computing machine will be imported following data respectively:
1) the driving engine revolution pulse count, the engine idle revolution that measure of engine speed sensor adds 200 rev/mins, driving engine maximum amount and decides rotating speed and add 100 rev/mins.
2) pulse count that obtains on the theoretical running radius of tire of tire, the corresponding car speed sensor of tire revolution.
Computing machine gets and enters initial condition automatically after electric.I.e. all zero clearings such as the register of all interim store data, counting machine.
Promptly begin acquired signal behind the computer initialization, the signal of collection divides two classes:
1) class is an impulse singla, i.e. engine speed and vehicle speed signal.They are main signals of judging the car load mode of operation.
2) class is an on-off signal, and promptly the brake pedal signal is lifted and stepped on to throw-out-of clutch, Das Gaspedal.They are the signals that interrupt voice output.
Leave the engine rotational speed signal and the vehicle speed signal of gathering two data fields of appointment among the RAM in respectively.
Access the engine speed counting subroutine, and read engine rotational speed signal.Calculate the per minute rotating speed V of driving engine according to the time span of impulse singla
0Be kept at and prepare among the RAM to call.
Access speed of a motor vehicle counting subroutine, and read the vehicle speed pulse signal.Theoretical running radius of tire R, wheel revolution pulse count n according to tire
1And the time span t of impulse singla, calculate per hour vehicle velocity V
1Being kept at speed of a motor vehicle zone bit question blank (2) data bank prepares to call at any time.
Fig. 5 is a computer operation diagram of circuit of the present invention, below in conjunction with the flowchart text algorithm:
(1) whether at the uniform velocity to judge the speed of a motor vehicle, concrete steps are as follows:
1) the vehicle speed pulse signal is counted, writing 30 pulses all over is one group, writes down the time span t1 of 30 pulses simultaneously and is kept at RAM assigned data district;
2) after the first group pulse time t1 preserves, carry out reading of second group of vehicle speed signal and time t2 again;
3) calculate t1/t2=λ, with λ=1 ± 3% as the whether stable judgment value of the speed of a motor vehicle, as λ＜1+3% or λ during 1+3%, the expression speed wobble need return and read new data again, former data are cancelled; When 1-3%＜λ＜1+3%, the expression speed of a motor vehicle is stable, calculates per hour vehicle velocity V
1, be kept at speed of a motor vehicle zone bit question blank (2) data bank and prepare to call at any time.
(2) gather engine speed V
0And vehicle velocity V
1Data leave two data fields among the RAM respectively in, access the speed ratio counting subroutine, calculate converter speed ratio B according to the actual measurement engine speed and the speed of a motor vehicle, by the cooresponding standard converter speed ratio of gear question blank (3) database lookup X, and then find gear value D
1, and preserve current D
1
(3) access speed of a motor vehicle pointer Z comparer program, according to the actual measurement vehicle velocity V
1Search cooresponding standard vehicle velocity V in speed of a motor vehicle zone bit question blank (2) data bank
2, and then searching cooresponding speed of a motor vehicle zone bit Z, the Z that chooses becomes 1 by 0;
(4) speed of a motor vehicle zone bit Z in the cooresponding speed of a motor vehicle and optional gear comparing watch (1) data bank
1～Z
7In one selected, also become 1 by 0, find the gear value D that chooses
2
(5) with the gear D that works in gear question blank (3) data bank
1With find gear value D in the speed of a motor vehicle and optional gear comparing watch (1) data bank
2In top-gear position D
2(being economic gear) compares;
If D
1=D
2Expression work gear conforms to economic gear, does not need the output prompting, and former data are cancelled to return and read new D
1
If D
1≠ D
2, detect interrupt signal again, if interrupt signal is arranged, represent that then vehicle in speed change or gearshift procedure, need not point out, former data are cancelled to return and are read new data;
If there is not interrupt signal, when allowing output, again with D
1With the D that chooses
2Medium-to-high grade comparing, comparative result output is pointed out:
D
1＜D
2, computing machine output " shift-up " prompting;
D
1=D
2, computing machine is not exported voice suggestion.
After exporting 1 signal, computing machine automatic time delay 3 seconds just allows to point out next time.
Between interruption and voice suggestion time delay, data acquisition is not interrupted, and new data replaces old data, and old data are overflowed.
(6) engine speed calculates:
1. set driving engine revolution=n
0Individual pulse.
2. detect n
0The time span t of individual pulse
0(s), just can calculate the rotating speed of the per minute of driving engine.
3. computing formula: V
0=60/t
0(r/min)
(7) calculating of vehicle velocity V 1:
1. set wheel and move a week, car speed sensor output n
1Individual pulse and time t (s), vehicle wheel roll radius R, available following formula calculates vehicle velocity V
1
2. speed of a motor vehicle computing formula: V
1=3.6*2 π R/ t (km/h)
(8) the gear D in travelling
1Search: (seeing Table 3)
1. according to the engine speed V of reality
0, vehicle velocity V
1, calculate change speed gear box converter speed ratio B.
2. the converter speed ratio B that calculates is not the gear value, but this speed ratio B must be near the number certain gear ratios X.So consider that by the deviation of B ± (3%～5%) B the certain coverage criteria speed ratio of its value scope X judges work gear D thus according to the converter speed ratio that calculates
1
(9) determining of the zone bit Z of the speed of a motor vehicle: (seeing Table 2)
1. the vehicle velocity V of calculating according to car speed sensor and transmitting ratio
1, in speed of a motor vehicle zone bit question blank (2) data bank, can find V
2
2. so long as the vehicle velocity V of checking
2, its zone bit Z becomes 1 by 0.The zone bit Z of all the other speed of a motor vehicle is 0.
3. zone bit Z is delivered in the speed of a motor vehicle and optional gear comparing watch (1) data bank and search gear D
2
(10) gear D
1(work gear), with the gear D that is chosen by speed of a motor vehicle zone bit Z
2Comparison: (seeing Table 1)
1. the speed of a motor vehicle zone bit Z that finds according to speed of a motor vehicle zone bit question blank (2) data bank finds out in the speed of a motor vehicle and optional gear comparing watch (1) data bank and allows several grades and can operate.
2. the gear D1 that finds according to gear question blank (3) data bank is with the gear D that chooses
2In top-gear (be economic gear, still be called D
2) relatively, make the following judgment:
D
1=D
2: no-output, do not point out.
D
1＜D
2: output once points out to shift up.
Interrupt (11):
1. work as D
1=D
2The time, program is returned and is read new data again.
2. work as D
1≠ D
2The time, must output speech trigger signal.
3. before triggering, inquire whether interrupt signal is arranged.
4., then stop voice and touch signal and send out output if interrupt signal is arranged.If there is not interrupt signal, then export the speech trigger signal.
(12) voice suggestion:
1. set: allow output to trigger 1 time with a kind of state.Speech IC triggers 1 time, and sounding is 2 times continuously.
2. the output of computer speech energizing signal just stops output for 1 time, waits for next time and triggering.
3. after computing machine stops to trigger, start time meter.Timing just allows new next time triggering after 3 seconds.
Core of the present invention is to calculate current work gear of automobile and optional gear, and whether definition top-gear position is an economic gear in optional gear, be economic gear by more current work gear, points out shift-up.Therefore, whether every is economic gear by more current work gear, points out shift-up, all belongs to protection scope of the present invention.
Claims (5)
1. a prompt method for vehicle to save oil comprises having engine speed and speed of a motor vehicle computing module in the computing machine, it is characterized in that: also deposit following three data banks in the computing machine in:
A) speed of a motor vehicle and optional gear comparing watch (1) data bank in the economic work district that can reflect this driving engine that sets up according to the driving engine curve that minimum oil consumption obtains under different rotating speeds and different gears;
B) set up one and the speed of a motor vehicle and optional gear comparing watch (1) data bank cooresponding speed of a motor vehicle zone bit question blank (2) data bank, speed of a motor vehicle zone bit question blank (2) data bank is listed actual measurement vehicle velocity V 1, standard vehicle velocity V 2, speed of a motor vehicle zone bit Z corresponding relation, as the gating pointer in each standard speed of a motor vehicle district;
C) set up a gear question blank (3) data bank, gear D1 that in gear question blank (3) data bank, stores and the corresponding relation of standard converter speed ratio X, so that the converter speed ratio B that is calculated by actual measurement searches cooresponding standard converter speed ratio X, and then the gear value D1 that finds a job;
V1: the actual measurement speed of a motor vehicle, according to the speed of a motor vehicle of engine speed by calculating;
V2: the standard speed of a motor vehicle is the segmentation speed of a motor vehicle of ECU foundation;
V
0: the mean engine crankshaft rotating speed;
D
1: the work gear of change speed gear box when referring to vehicle ';
D
2: the optional gear that refers to change speed gear box under certain speed of a motor vehicle;
X: refer to each grade speed ratio that the change speed gear box design is determined;
B: calculate the change speed gear box speed ratio that draws according to the relation between the speed of a motor vehicle and the engine speed; Concrete steps are as follows:
(1) gathers engine speed and vehicle speed pulse and calculation engine rotating speed V
0, and vehicle velocity V
1, and with V
0, V
1Leave two data fields of appointment among the RAM respectively in;
(2) according to actual measurement engine speed V
0And vehicle velocity V
1Calculate converter speed ratio B, by gear question blank (3) data bank, search cooresponding standard converter speed ratio X, and then search cooresponding gear D
1, and the D1 that chooses is kept at the data field of appointment among the RAM;
(3) according to the actual measurement vehicle velocity V
1Search cooresponding standard vehicle velocity V in speed of a motor vehicle zone bit question blank (2) data bank
2, and then searching cooresponding speed of a motor vehicle zone bit Z, the Z that chooses becomes 1 by 0;
(4) speed of a motor vehicle zone bit Z in the cooresponding speed of a motor vehicle and optional gear comparing watch (1) data bank also becomes 1 by 0, and finds optional gear value D2 thus;
(5) will find gear value D in the gear D1 and the speed of a motor vehicle in gear question blank (3) data bank and optional gear comparing watch (1) data bank
2In the top-gear position, promptly economic gear compares;
If D
1=D
2Expression work gear conforms to economic gear, does not need the output prompting, and former data are cancelled, and carry out said process again;
If D
1≠ D
2The time, detecting interrupt signal again, interrupt signal comprises that throw-out-of clutch, Das Gaspedal lift and step on the brake pedal signal, if interrupt signal is arranged, represents that then vehicle in speed change or gearshift procedure, need not point out, former data are cancelled to return and are read new data;
D
1≠ D
2The time, if there is not interrupt signal, then export cue;
D
1＜D
2, computing machine output " shift-up " prompting;
D
1=D
2, computing machine is not exported voice suggestion.
2. prompt method for vehicle to save oil according to claim 1 is characterized in that: at the uniform velocity concrete steps are as follows to judge the speed of a motor vehicle:
1) vehicle speed pulse signal number n is counted, writing n+1=30 pulse all over is one group, writes down the time span t1 of 30 pulses simultaneously and is kept at the data field of appointment among the RAM;
2) after the first group pulse time t1 preserves, carry out reading of second group of 30 vehicle speed pulse signal and time t2 again;
3) calculate t1/t2=λ ratio, when λ changes within 1 ± 3% scope, just: 1-3%＜λ＜1+3% is considered as at the uniform velocity in the interval, and as vehicle velocity V
1Whether stable judgment value as λ＜1-3% or λ〉during 1+3%, the expression speed wobble need return and read new data again, and former data are cancelled.
3. prompt method for vehicle to save oil according to claim 1 and 2 is characterized in that: 1 speech trigger signal of the every output of computing machine, and continuous 2 voice suggestions of sound circuit, computing machine automatic time delay 3 seconds just allows to point out next time.
4. prompt method for vehicle to save oil according to claim 1 and 2 is characterized in that: between interruption and voice suggestion time delay, data acquisition is not interrupted, and new data replaces old data, and old data are overflowed.
5. prompt method for vehicle to save oil according to claim 1 and 2 is characterized in that: the B value is got its computing value B ± (3%～5%) B, with this coverage criteria converter speed ratio X, with the convenient X that seeks.
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Assignee: Dongfeng Xiangfan Touring Car Co.,Ltd. Assignor: DONGFENG AUTOMOBILE Co.,Ltd. Contract fulfillment period: 2009.2.20 to 2019.2.17 Contract record no.: 2009420000042 Denomination of invention: Prompt method for vehicle to save oil Granted publication date: 20090218 License type: Exclusive license Record date: 20090608 |
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