CN204436651U - For the changeable flow low-voltage fuel oil supplying device of supercharging directly jetting gasoline engine - Google Patents
For the changeable flow low-voltage fuel oil supplying device of supercharging directly jetting gasoline engine Download PDFInfo
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- CN204436651U CN204436651U CN201420831139.6U CN201420831139U CN204436651U CN 204436651 U CN204436651 U CN 204436651U CN 201420831139 U CN201420831139 U CN 201420831139U CN 204436651 U CN204436651 U CN 204436651U
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Abstract
The utility model relates to a kind of changeable flow low-voltage fuel oil supplying device for supercharging directly jetting gasoline engine, and this device comprises high pressure oil pump, low pressure fuel pump, control unit of engine, fuel pump control module, pressure-temperature sensor; Described high pressure oil pump is connected with low pressure fuel pump by low pressure oil supply pipeline; Pressure-temperature sensor is arranged on low pressure oil supply pipeline, and its output is connected to control unit of engine; Control unit of engine is connected with low pressure fuel pump by fuel pump control module.The utility model according to actual fuel demand amount control oil pump with the most rational rotation speed operation, thus can reduce fuel consume, reduction noise.Oil pump control module, except basic control oil pump rotating speed functions, also has the functions such as low pressure fuel pump fault diagnosis functions, voltage compensating function, temperature correction.
Description
Technical field
The utility model belongs to the technical field of supercharging directly jetting gasoline engine low-voltage fuel oil supply system, relates generally to a kind of low-voltage fuel oil supplying device of changeable flow.
Background technique
At present, the low pressure oil supply method of the common use of domestic main engine factory mainly controls low pressure fuel pump by a relay, this mode is always to provide the fuel oil of maximum flow to motor, but motor is not need so many fuel oil supplies each moment, and unnecessary fuel oil is flowed back to again in fuel tank by the relief valve of oil pump.Such meeting significantly increases vehicle electric load, fuel oil temperature and fuel evaporation amount, increases fuel consume, is unfavorable for the requirement meeting country's phase III fuel oil limit value.
Summary of the invention
The technical problems to be solved in the utility model is to provide one according to actual fuel demand amount control oil pump with the most rational rotation speed operation, thus can reduce the changeable flow low-voltage fuel oil supplying device for supercharging directly jetting gasoline engine of fuel consume, reduction noise.
In order to solve the problems of the technologies described above, the changeable flow low-voltage fuel oil supplying device for supercharging directly jetting gasoline engine of the present utility model comprises high pressure oil pump, low pressure fuel pump, control unit of engine, fuel pump control module, pressure-temperature sensor; Described high pressure oil pump is connected with low pressure fuel pump by low pressure oil supply pipeline; Pressure-temperature sensor is arranged on low pressure oil supply pipeline, and its output is connected to control unit of engine; Control unit of engine is connected with low pressure fuel pump by fuel pump control module.
The fuel pressure signal of pressure-temperature sensor monitoring low pressure oil supply pipeline, temperature signal be transferred to control unit of engine; After control unit of engine receives fuel pressure signal, the flow of current low-pressure oil supply system can be calculated according to current operating mode, calculate according to the fuel demand of motor reality and temperature correlation fuel pressure demands and export PWM controling parameters again, calculated the magnitude of voltage needing to be supplied to low pressure fuel pump by oil pump control module, thus control low pressure fuel pump with corresponding rotation speed operation.The utility model according to actual fuel demand amount control oil pump with the most rational rotation speed operation, thus can reduce fuel consume, reduction noise.Oil pump control module, except basic control oil pump rotating speed functions, also has the functions such as low pressure fuel pump fault diagnosis functions, voltage compensating function, temperature correction.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the changeable flow low-voltage fuel oil supplying device structural representation for supercharging directly jetting gasoline engine of the present utility model.
Fig. 2 is control unit of engine working procedure flow chart.
Fig. 3 is low pressure fuel pump performance diagram.
Fig. 4 is temperature correlation fuel pressure demand curve figure:
Embodiment
As shown in Figure 1, the changeable flow low-voltage fuel oil supplying device for supercharging directly jetting gasoline engine of the present utility model comprises high pressure oil pump 4, low pressure fuel pump 1, control unit of engine 5, fuel pump control module 2, pressure-temperature sensor 3; Described high pressure oil pump 4 is connected with low pressure fuel pump 1 by low pressure oil supply pipeline; Pressure-temperature sensor 3 is arranged on low pressure oil supply pipeline, and its output is connected to control unit of engine 5; Control unit of engine 5 is connected with low pressure fuel pump 1 by fuel pump control module 2.
Control unit of engine working procedure is specific as follows:
One, gather the voltage signal V that pressure-temperature sensor exports, and convert fuel pressure physical values P_raw to according to internal calculation formula;
P_raw＝(V-V_min)×(P_max-P_min)/(V_max-V_min) (1)
Wherein V_max, V_min, P_min and P_max are known quantity, V_min is normal minimum output voltage, V_max is normal maximum output voltage, P_min is minimum pressure measurement (the intrinsic parameter of pressure-temperature sensor), and P_max is pressure maximum test volume (the intrinsic parameter of pressure-temperature sensor);
Two, export P_filter after carrying out filtering to fuel pressure physical values P_raw, can ensure the level and smooth of signal and stick signal feature to greatest extent, computing function is P_filter_CAL ();
P_filter＝P_filter_CAL(P_raw) (2)
Three, gather the fuel oil temperature T that pressure-temperature sensor exports, according to fuel flow demand Q and the fuel oil temperature T of actual conditions, calculate target pressure value P_target;
1. fuel flow demand is calculated;
Q＝(P_fuel×S_fuel×TI_fuel)×N×120 (3)
Wherein P_fuel is high pressure oil rail pressure (is with engine working conditions change and the amount of change, responds to by rail pressure sensor), and S_fuel is oil sprayer projected area, and TI_fuel is fuel injection pulsewidth, and N is engine start machine tach signal;
2. according to oil pump characteristic curve, as shown in Figure 3, obtained by interpolation and can realize the minimum low pressure oil pressure request P_1 of this fuel flow demand and maximum low pressure oil pressure request P_2,
3. consider fuel oil temperature T, according to temperature correlation fuel pressure demand curve, obtained the minimum fuel pressure demands of temperature correlation by interpolation: P_3, as shown in Figure 4;
4. consider P_1, P_2 and P_3, calculate target pressure value P_target;
1) P_3>P_2 is worked as, P_target=P_3;
2) P_2>P_3>P_1 is worked as, P_target=P_3;
3) P_1>P_3 is worked as, P_target=P_1;
Four, controlling actual fuel pressure P_filter take P_target as target closed loop control, and calculate required control signal target duty than PWM_delta, computing function is PWM_CAL ();
PWM_delta＝PWM_CAL(P_filter－P_target，PWM_current，TI_delta)
PWM_current is current duty cycle, and TI_delta is that seeking time is wanted in adjustment;
Five, different according to Oil pump electrical machinery characteristic requirements, judges whether PWM_delta exceedes the rate of change PWM_delta_MAX of oil pump permission, calculates dutycycle correction factor PWM_factor, and main purpose is protection motor;
1. PWM_delta>PWM_delta_MAX is worked as, PWM_factor=0;
2. PWM_delta=PWM_delta_MAX is worked as, PWM_factor=0;
3. PWM_delta<PWM_delta_MAX is worked as,
PWM_factor＝(PWM_delta_MAX-PWM_delta)；
Six, according to control signal current duty cycle PWM_current, control signal target duty than PWM_delta and dutycycle correction factor PWM_factor, calculate actual output control signal dutycycle PWM_actual;
PWM_actual＝PWM_current+PWM_delta－PWM_factor。
Claims (1)
1. one kind comprises high pressure oil pump (4) for the changeable flow low-voltage fuel oil supplying device of supercharging directly jetting gasoline engine, low pressure fuel pump (1), control unit of engine (5), fuel pump control module (2), pressure-temperature sensor (3); Described high pressure oil pump (4) is connected with low pressure fuel pump (1) by low pressure oil supply pipeline; Pressure-temperature sensor (3) is arranged on low pressure oil supply pipeline, and its output is connected to control unit of engine (5); Control unit of engine (5) is connected with low pressure fuel pump (1) by fuel pump control module (2).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420831139.6U CN204436651U (en) | 2014-12-24 | 2014-12-24 | For the changeable flow low-voltage fuel oil supplying device of supercharging directly jetting gasoline engine |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420831139.6U CN204436651U (en) | 2014-12-24 | 2014-12-24 | For the changeable flow low-voltage fuel oil supplying device of supercharging directly jetting gasoline engine |
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| CN204436651U true CN204436651U (en) | 2015-07-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612867A (en) * | 2014-12-24 | 2015-05-13 | 中国第一汽车股份有限公司 | Variable flow low pressure fuel oil supplying device and method for pressurizing gasoline direct injection engine |
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2014
- 2014-12-24 CN CN201420831139.6U patent/CN204436651U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104612867A (en) * | 2014-12-24 | 2015-05-13 | 中国第一汽车股份有限公司 | Variable flow low pressure fuel oil supplying device and method for pressurizing gasoline direct injection engine |
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