JP4040307B2 - Engine gasoline alternative fuel injection control device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gasoline alternative fuel injection control device that injects gasoline alternative fuel such as liquefied petroleum gas (LPG) or liquefied natural gas (LNG) into each cylinder of an engine. Specifically, a gasoline alternative fuel injection control unit and a fuel system device for gasoline alternative fuel injection are added to the base system including the gasoline injection control unit, and the gasoline injection signal output from the gasoline injection control unit of the base system is replaced with the gasoline alternative fuel. The present invention relates to a gasoline alternative fuel injection control device for an engine which is corrected and output as a gasoline alternative fuel injection signal by an injection control unit, and performs gasoline alternative fuel injection by a fuel system device for gasoline alternative fuel injection.
[0002]
[Prior art]
Conventionally, various technologies related to an engine using, for example, LPG as fuel as a gasoline alternative fuel have been proposed. For example, in the document “Automotive Technology” (vol.55, No.5, 2001), there is a presentation entitled “Research and Development Trend of LPG Fuel Engine System”, among which the fifth generation (electronically controlled liquid injection) The fuel supply system produced and sold as “LPi system” by Vialle is introduced.
[0003]
The “LPi system” is configured as a “bi-fuel system” that switches between gasoline and LPG. As shown in FIG. 21, this system includes a base vehicle gasoline engine control unit (gasoline ECU), a gasoline fuel system device including a gasoline injector, an LPG control computer (LPE), and an LPG injector. Including an LPG fuel system device and an LPG / gasoline selector switch. By switching the switch, a mode in which gasoline is injected into the engine using a gasoline ECU and a gasoline injector and a mode in which LPG is injected into the engine using an LPE and an LPG injector are switched. In the LPG injection mode, the LPE controls the LPG injection amount by the LPG injector in conjunction with the gasoline ECU. That is, the base gasoline ECU determines a gasoline injection amount (gasoline injection time) based on measured values such as air amount, intake air temperature, engine cooling water temperature, and engine load, and outputs the injection signal to the LPE. The LPE executes the LPG injection by converting (correcting) the gasoline injection time into an LPG injection amount (LPG injection time) and outputting it to the LPG injector.
[0004]
In the “LPi system”, even when the base gasoline system employs independent injection, the LPG system employs group injection that simultaneously injects into two cylinders. Further, the crank angle signal is not taken into the LPE, and the injection by the LPG injector is started in synchronization with the injection end timing of the gasoline injection time determined by the base gasoline ECU.
[0005]
Here, in the “LPi system”, the relationship between the gasoline injection timing by the gasoline ECU and the LPG injection timing by the LPE in the group injection control for simultaneously injecting into the two cylinders is shown in FIGS. In this time chart, a 4-cylinder engine is shown, and independent injection is performed in the base gasoline injection system. As for gasoline injection, fuel injection is performed in the order of the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2. As for the LPG injection, fuel injection is performed in the order of the group of the first cylinder # 1 and the third cylinder # 3 and the group of the fourth cylinder # 4 and the second cylinder # 2. In FIG. 22A, rectangles with “A, B” indicate gasoline injection signals corresponding to the cylinders # 1, # 4, and with “A ′, B ′” in FIG. The rectangles shown indicate the LPG injection signals corresponding to the groups of cylinders # 1 and # 3 and # 3 and the groups of cylinders # 4 and # 2, respectively. It represents the difference. As shown in FIG. 22A, a gasoline injection signal for a predetermined time is output at the beginning of the intake stroke. Then, in synchronization with the end timing of the gasoline injection signal, as shown in FIG. 22B, the LPG injection signal starts to be output for each cylinder group.
[0006]
Here, when the LPG injection control of the “LPi system” is applied to the independent injection control of the multi-cylinder engine, the relationship between the gasoline injection timing by the gasoline ECU and the LPG injection timing by the LPE is shown in FIGS. ). This time chart shows a 4-cylinder engine, and fuel injection is performed in the order of the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2. In FIG. 23A, rectangles with “A, B, C, D” indicate gasoline injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2, and in FIG. , Rectangles with “A ′, B ′, C ′, D ′” indicate LPG injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2, and the difference in length is the injection time. Represents the difference. As shown in FIG. 23 (a), a gasoline injection signal for a predetermined time is output at the beginning of the intake stroke. Then, in synchronization with the end timing of the gasoline injection signal, an LPG injection signal starts to be output for each cylinder # 1, # 3, # 4, and # 2, as shown in FIG. 23 (b).
[0007]
[Problems to be solved by the invention]
However, when LPG injection control is applied to multi-cylinder group injection control or independent injection control as described above, in group injection control, as shown in FIGS. 4, since LPG injection is started at the end timing of gasoline injection in the first cylinder # 1 and the fourth cylinder # 4 as the base, the LPG injection is performed for gasoline in the third cylinder # 3 and the second cylinder # 2. Although it is performed at a timing earlier than the injection, the LPG injection is performed later than the gasoline injection for the first cylinder # 1 and the fourth cylinder # 4. On the other hand, in the independent injection control, as shown in FIGS. 23A and 23B, in each cylinder # 1 to # 4, LPG injection is started at the end timing of the base gasoline injection. The LPG injection is performed later than the gasoline injection.
[0008]
Here, it is generally said that it is desirable for the fuel injection timing to end before the start of the intake stroke. However, in the LPG injection control of the group injection, as shown in FIG. 22 (a), the gasoline injection signal is output at the beginning of the intake stroke for each of the cylinders # 1 and # 4. In the # 1 and # 4 cylinders, the LPG injection timing is in the middle and late stages of the intake stroke as shown in FIG. For this reason, it becomes difficult for LPG injected near the end of LPG injection to be sucked into the corresponding cylinders # 1 and # 4, leading to a decrease in engine output. Similarly, in the LPG injection control of the independent injection, as shown in FIG. 23A, the gasoline injection is performed at the beginning of the intake stroke for each of the cylinders # 1 to # 4. In 1 to # 4, the LPG injection timing is applied in the middle and late stages of the intake stroke as shown in FIG. For this reason, it becomes difficult for LPG injected near the end of LPG injection to be sucked into the corresponding cylinders # 1 to # 4, leading to a decrease in engine output.
[0009]
In particular, when the engine has a high load, the base gasoline injection amount calculated by the gasoline ECU becomes relatively large, and accordingly, the LPG injection signal corrected by the LPE also becomes long. For this reason, the vicinity of the end of the LPG injection may reach the compression stroke, and the LPG may not completely enter the corresponding cylinders # 1 to # 4. In this case, there is a risk that the engine will be greatly reduced in output.
[0010]
The problem as described above may occur even in an engine that uses liquefied gas fuel such as LNG other than LPG instead of gasoline.
[0011]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an engine gasoline alternative fuel injection control capable of preventing a delay in injection of gasoline alternative fuel in all cylinders and suppressing a decrease in engine output. To provide an apparatus.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the invention according to claim 1 includes a plurality of cylinders and operates to sequentially repeat a series of intake strokes, compression strokes, expansion strokes, and exhaust strokes for each cylinder while shifting from each other. The engine, a plurality of injectors for injecting and supplying alternative fuel for each cylinder, operating state detecting means for detecting the operating state of the engine, and a predetermined injection order based on the detected operating state A gasoline injection control unit for calculating the gasoline injection amount to be supplied to the cylinder to be operated and outputting the calculated gasoline injection amount as a gasoline injection signal at the beginning of the intake stroke of each cylinder, and each cylinder from the gasoline injection control unit The gasoline injection signal output for each cylinder is corrected for conformity to gasoline alternative fuel, and is injected into each cylinder as a gasoline alternative fuel injection signal. And sequentially output to Perform gasoline alternative fuel injection control A gasoline alternative fuel injection control device for an engine with a gasoline alternative fuel injection control unit for the gasoline alternative fuel injection control unit Control the shooting In order to adapt the gasoline injection signal output from the gasoline injection control unit corresponding to the cylinder corresponding to the previous injection sequence to the gasoline alternative fuel for the current gasoline alternative fuel injection of a certain cylinder. The gasoline alternative fuel injection amount is calculated by correcting to the gasoline alternative control based on the calculated gasoline alternative fuel injection amount from the start of the current gasoline injection signal output corresponding to a cylinder from the gasoline injection control unit. It is intended to output a fuel injection signal to an injector corresponding to a certain cylinder.
[0013]
According to the configuration of the gasoline alternative fuel injection control device for an engine of the above-described invention, the operating state of the engine operating to sequentially repeat a series of intake strokes, compression strokes, expansion strokes and exhaust strokes for each cylinder while mutually shifting. The operating state is detected by the detecting means. Based on the detected operating state, the gasoline injection control unit calculates the gasoline injection amount to be supplied to the cylinder corresponding to the predetermined injection order, and at the beginning of the intake stroke for each cylinder, Is output. In the gasoline alternative fuel injection control unit, Gasoline alternative fuel injection control is performed, The gasoline injection signal output for each cylinder from the gasoline injection control unit is corrected for conformity to gasoline alternative fuel, and is sequentially output to the injector for each cylinder as a gasoline alternative fuel injection signal. Injection is performed.
Here, the gasoline alternative fuel injection control unit Control the shooting The gasoline injection signal output from the gasoline injection control unit corresponding to the cylinder corresponding to the previous injection order for the current gasoline alternative fuel injection of a cylinder Is corrected to the gasoline alternative fuel injection amount. In the gasoline alternative fuel injection control unit, the gasoline alternative fuel injection based on the calculated gasoline alternative fuel injection amount from the start of output of the current gasoline injection signal output corresponding to a certain cylinder from the gasoline injection control unit. A signal is output to an injector corresponding to the certain cylinder. Therefore, the start of gasoline alternative fuel injection in a certain cylinder is synchronized with the start of output of a gasoline injection signal for that cylinder, and gasoline alternative fuel injection is started before the intake stroke in all cylinders.
[0014]
In order to achieve the above object, the invention according to claim 2 includes a plurality of cylinders and operates so as to sequentially repeat a series of intake strokes, compression strokes, expansion strokes and exhaust strokes for each cylinder while shifting each other. The engine, a plurality of injectors for injecting and supplying alternative fuel for each cylinder, operating state detecting means for detecting the operating state of the engine, and a predetermined injection order based on the detected operating state A gasoline injection control unit for calculating a gasoline injection amount to be supplied to a cylinder to be output, and outputting the calculated gasoline injection amount as a gasoline injection signal at the beginning of an intake stroke of some of the cylinders; As a gasoline alternative fuel injection signal, the gasoline injection signal output from the injection control unit for each cylinder is corrected for conformity to gasoline alternative fuel. At least sequentially outputs to the injector of each cylinder group consisting of two cylinders comprising a part of the cylinder Perform gasoline alternative fuel injection control A gasoline alternative fuel injection control device for an engine with a gasoline alternative fuel injection control unit for the gasoline alternative fuel injection control unit Control the shooting For this time, the gasoline injection signal output from the gasoline injection control unit corresponding to the cylinder corresponding to the previous injection sequence for the gasoline alternative fuel injection of a certain cylinder group is applied to the gasoline alternative fuel. Therefore, the gasoline alternative fuel injection amount calculated from the start of output of the current gasoline injection signal output corresponding to a certain cylinder group from the gasoline injection control unit is calculated. The gasoline alternative fuel injection signal based on the above is output to a plurality of injectors corresponding to the cylinders of a certain cylinder group.
[0015]
According to the configuration of the gasoline alternative fuel injection control device for an engine of the above-described invention, the operating state of the engine operating to sequentially repeat a series of intake strokes, compression strokes, expansion strokes and exhaust strokes for each cylinder while mutually shifting. The operating state is detected by the detecting means. Then, based on the detected operating state, the gasoline injection control unit calculates the gasoline injection amount to be supplied to the cylinder corresponding to the predetermined injection order, and the intake stroke of some cylinders of the plurality of cylinders is calculated. First, it is output as a gasoline injection signal. In the gasoline alternative fuel injection control unit, Gasoline alternative fuel injection control is performed, The gasoline injection signal output for each cylinder from the gasoline injection control unit is corrected for conformity to gasoline alternative fuel, and consists of at least two cylinders including the some cylinders as the gasoline alternative fuel injection signal The fuel is sequentially output to the injectors for each cylinder group, and gasoline alternative fuel injection is performed by the plurality of injectors.
Here, the gasoline alternative fuel injection control unit Control the shooting For this time, the gasoline injection signal output from the gasoline injection control unit corresponding to the previous cylinder is corrected for conformity to the gasoline alternative fuel. A gasoline alternative fuel injection amount is calculated. In the gasoline alternative fuel injection control unit, the gasoline alternative fuel injection based on the calculated gasoline alternative fuel injection amount from the start of output of the current gasoline injection signal output corresponding to a cylinder group from the gasoline injection control unit. The signal is output to a plurality of injectors corresponding to the cylinders of a certain cylinder group. Therefore, the start of gasoline alternative fuel injection in a plurality of cylinders of a certain cylinder group is synchronized with the start of output of a gasoline injection signal for those cylinders, and gasoline alternative fuel injection is started before the intake stroke in all cylinders. Will be.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
[First Embodiment]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment that embodies a gasoline alternative fuel injection control device for an engine according to the present invention will be described below in detail with reference to the drawings.
[0017]
In this embodiment, the present invention is embodied in an LPG engine system that uses liquefied petroleum gas (LPG) as a gasoline alternative fuel. FIG. 1 is a schematic configuration diagram showing the LPG engine system of the present embodiment. This engine system is a gasoline alternative fuel injection control unit of the present invention compared to a gasoline engine 1 and a base system including an electronic control unit for gasoline (ECU for gasoline) 2 as a gasoline injection control unit of the present invention. An LPG electronic control unit (LPG ECU) 3 and a fuel system device for LPG injection are provided. In this engine system, the gasoline injection signal output from the gasoline ECU 2 is corrected by the LPG ECU 3 to be adapted to the LPG and output as an LPG injection signal, and the LPG injection fuel system device performs LPG injection. It is a mono-fuel type constructed.
[0018]
The engine system mounted on the vehicle includes an LPG tank 4 for storing LPG. An LPG pump 5 built in the LPG tank 4 discharges LPG stored in the tank 4. In this embodiment, the gasoline engine 1 is a reciprocating type four-cylinder engine, and a series of each of the first cylinder # 1, the second cylinder # 2, the third cylinder # 3, and the fourth cylinder # 4. The intake stroke, the compression stroke, the expansion stroke, and the exhaust stroke are operated so as to be sequentially repeated while being shifted from each other. Each cylinder # 1 to # 4 is provided with an LPG injector 6 for injecting and supplying LPG. The LPG discharged from the LPG pump 5 is supplied to each LPG injector 6 through the LPG line 7 and the delivery pipe 8. The supplied LPG is injected in liquid form into the intake ports of the cylinders # 1 to # 4 that communicate with the intake passage 9 by the operation of the LPG injectors 6. Air is taken into the intake passage 9 from the outside. The air taken into the intake passage 9 and the LPG injected from each LPG injector 6 are sucked into the combustion chamber 10 of each cylinder # 1 to # 4 as a combustible air-fuel mixture.
[0019]
The intake passage 9 is provided with a throttle valve 11 that is operated by a predetermined accelerator device (not shown). By opening and closing the throttle valve 11, the amount of air (intake amount) taken into the combustion chambers 10 from the intake passage 9 is adjusted.
[0020]
The spark plugs 12 provided in the combustion chambers 10 of the respective cylinders # 1 to # 4 receive an ignition signal output from the ignition coil 13 and perform an ignition operation. Each spark plug 12 and ignition coil 13 constitute an ignition device for igniting the combustible mixture sucked into the combustion chamber 10. In each of the cylinders # 1 to # 4, the combustible air-fuel mixture sucked into the combustion chamber 10 during the intake stroke is compressed during the compression stroke, and the spark plug 12 performs a spark operation during the expansion stroke to explode, burn, and expand. The exhaust gas after combustion is discharged to the outside from the combustion chamber 10 through the exhaust passage 14 in the subsequent exhaust stroke. As the combustible air-fuel mixture burns in the combustion chambers 10 of the cylinders # 1 to # 4, the piston 15 moves up and down and the crankshaft 16 rotates, so that the driving force for driving the vehicle is the engine 1. can get.
[0021]
In the middle of the outlet of the LPG pump 5 and the LPG line 7, shut-off valves 17 and 18 for forcibly shutting off the LPG flow are provided. A pressure regulator 20 for keeping the LPG pressure in the delivery pipe 8 constant is provided at the end of the return line 19 that returns from the delivery pipe 8 to the LPG tank 4.
[0022]
The various sensors 31, 32, 33, 34, and 35 provided in the engine 1 and the like correspond to the operating state detecting means of the present invention for detecting various operating parameters related to the operating state of the engine 1, and are respectively gasoline. The ECU 2 is connected. That is, the throttle sensor 31 provided in the vicinity of the throttle valve 11 detects the opening degree (throttle opening degree) TA of the throttle valve 11 and outputs an electric signal corresponding to the detected value. The intake pressure sensor 32 provided in the intake passage 9 detects the intake pressure PM in the intake passage 9 on the downstream side of the throttle valve 11 and outputs an electric signal corresponding to the detected value. The water temperature sensor 33 provided in the engine 1 detects the temperature (cooling water temperature) THW of the cooling water flowing inside the engine 1 and outputs an electrical signal corresponding to the detected value. The rotational speed sensor 34 provided in the engine 1 detects the rotational speed (engine rotational speed) NE of the crankshaft 16 and outputs an electrical signal corresponding to the detected value. The oxygen sensor 35 provided in the exhaust passage 14 detects the oxygen concentration (output voltage) Ox in the exhaust gas discharged to the exhaust passage 14 and outputs an electrical signal corresponding to the detected value.
[0023]
In this embodiment, the gasoline ECU 2 inputs various signals output from the various sensors 31 to 35 described above. The gasoline ECU 2 executes gasoline injection control, ignition timing control, and the like based on these input signals, and the gasoline injection signals Q1, Q2, Q3, Q4 corresponding to the cylinders # 1 to # 4 are transmitted to the LPG ECU 3. And ignition signals corresponding to the cylinders # 1 to # 4 are output to the ignition coil 13. The gasoline injection signal essentially corresponds to a drive signal for driving the gasoline injector in the base system.
[0024]
Here, the gasoline injection control is to control the gasoline injection amount and the injection timing by the gasoline injector provided in each cylinder # 1 to # 4 based on the operating state of the engine 1 in the original base system. Therefore, the gasoline ECU 2 calculates a gasoline injection amount corresponding to the operating state of the engine 1 and outputs the injection amount to the LPG ECU 3 as a gasoline injection signal. The ignition timing control is to control the ignition timing by the ignition plugs 12 of the cylinders # 1 to # 4 by controlling the ignition coil 13 in accordance with the operating state of the engine 1.
[0025]
Here, the LPG tank 4, the LPG pump 5, the LPG line 7, the pressure regulator 8, each LPG injector 6, the return line 19, and the shut-off valves 17 and 18 are used in order to make the base system into a mono-fuel type LPG engine system. It is a fuel system device for LPG injection provided instead of the fuel system device for gasoline injection. Since LPG has a large property change with respect to temperature and pressure compared to gasoline, in order to accurately calculate the LPG injection amount from each LPG injector 6, the LPG injection amount is corrected according to the temperature state and pressure state of the LPG. There is a need to. Therefore, in order to detect the temperature state and pressure state of the LPG, the LPG tank 4 is provided with a tank LPG temperature sensor 36 and a tank LPG pressure sensor 37, and the delivery pipe 8 has a pipe LPG temperature sensor 38. And a pipe LPG pressure sensor 39 is provided. These sensors 36 to 39 are connected to the LPG ECU 3, respectively. The LPG ECU 3 is connected to the LPG pump 5, the two shutoff valves 17 and 18, and the LPG injectors 6 of the cylinders # 1 to # 4. Further, the throttle sensor 31 is also connected to the LPG ECU 3.
[0026]
In this embodiment, the LPG ECU 3 inputs various signals output from the various sensors 31, 36 to 39. Based on these input signals, the LPG ECU 3 executes correction control for correcting the gasoline injection signal for conformity to LPG, and timing control for replacing the gasoline injection timing with the LPG injection timing. Are sequentially output as LPG injection signals to the LPG injectors 6 for # 4.
[0027]
Each of the gasoline ECU 2 and the LPG ECU 3 includes a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), a backup RAM, an external input circuit, an external output circuit, and the like. Each of the ECUs 2 and 3 constitutes a logical operation circuit formed by connecting a CPU, a ROM, a RAM, a backup RAM, an external input circuit, an external output circuit, and the like through a bus. Each ROM stores a predetermined control program related to various controls in advance. Each RAM temporarily stores the calculation result of each CPU. Each backup RAM stores data stored in advance. Each CPU executes the above-described various controls according to a predetermined control program based on detection signals from the various sensors 31 to 39 input via the input circuit.
[0028]
FIG. 2 is a block diagram showing an electrical configuration related to LPG injection control of this engine system. The various sensors 31 to 35 described above are connected to the gasoline ECU 2. The various sensors 31, 36 to 39 described above are connected to the LPG ECU 3. The gasoline ECU 2 has output terminals 41a, 41b, 41c and 41d for gasoline injection signals corresponding to the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4 and the second cylinder # 2. . These output terminals 41a to 41d are connected in parallel to the input terminals 42a, 42b, 42c and 42d provided in the LPG ECU 3. The LPG ECU 3 has output terminals 43a, 43b, 43c, 43d for LPG injection signals corresponding to the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2, respectively. Have. These output terminals 43a to 43d are connected to the respective LPG injectors 6 provided for the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2.
[0029]
As a result, the gasoline injection signal (indicated by [A] in FIG. 2) corresponding to the first cylinder # 1 output from the gasoline ECU 2 is corrected by the LPG ECU 3 for conformity to the LPG. An LPG injection signal (indicated by [A ′] in FIG. 2) is output to the LPG injector 6 corresponding to the cylinder # 4. Similarly, the gasoline injection signal (indicated by [B] in FIG. 2) output from the gasoline ECU 2 and corresponding to the third cylinder # 3 is corrected by the LPG ECU 3 for conformity to the LPG. An LPG injection signal (indicated by [B ′] in FIG. 2) is output to the LPG injector 6 corresponding to the cylinder # 2. The gasoline injection signal (indicated by [C] in FIG. 2) output from the gasoline ECU 2 and corresponding to the fourth cylinder # 4 is corrected by the LPG ECU 3 for conformity to the LPG, and the first cylinder. An LPG injection signal (indicated by [C ′] in FIG. 2) is output to the LPG injector 6 corresponding to # 1. Similarly, the gasoline injection signal (indicated by [D] in FIG. 2) output from the gasoline ECU 2 and corresponding to the second cylinder # 2 is corrected by the LPG ECU 3 for conformity to the LPG. An LPG injection signal (indicated by [D ′] in FIG. 2) is output to the LPG injector 6 corresponding to the cylinder # 3.
[0030]
FIGS. 3A and 3B are time charts showing the relationship between the gasoline injection signal output from the gasoline ECU 2 and the LPG injection signal output from the LPG ECU 3 corresponding to each cylinder # 1 to # 4. Shown in In this time chart, LPG injection is performed in the order of the first cylinder # 1, the third cylinder # 3, the fourth cylinder # 4, and the second cylinder # 2. In FIG. 3A, rectangles with “A, B, C, D” indicate gasoline injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2, and in FIG. , Rectangles with “C ′, D ′, A ′, B ′” indicate LPG injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2, respectively, and the difference in length is the injection time. Represents the difference.
Hereinafter, for convenience, “A, B, C, D” are the gasoline injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2, respectively, and the gasoline injection time corresponding to the gasoline injection amount. Both (pulse width (ON time)) shall be expressed. Similarly, “C ′, D ′, A ′, B ′” are LPG injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2, respectively, and the LPG injection time corresponding to the LPG injection amount for convenience. And both.
[0031]
In this embodiment, the LPG ECU 3 performs the current LPG injection in a certain cylinder # 1, # 3, # 4, # 2 in the cylinder # 1, # 3, # 4, # 2 corresponding to a predetermined injection order. Therefore, the gasoline before the two-injection cylinders # 1, # 3, # 4, and # 2 before the two injections of the cylinders # 1, # 3, # 4, and # 2 are output from the gasoline ECU 2 The current gasoline injection signal output from the ECU 2 for gasoline corresponding to the cylinders # 1, # 3, # 4, and # 2 after correcting the injection signal for LPG and calculating the LPG injection time. From the start of output, an LPG injection signal based on the calculated LPG injection time is output to the LPG injectors 6 corresponding to the cylinders # 1, # 3, # 4, and # 2.
[0032]
That is, in order to perform LPG injection for a certain cylinder # 1, # 3, # 4, and # 2, the LPG ECU 3 performs cylinder # 4 before 2 injection timing (in the case of a 4-cylinder engine 1, before 360 ° CA). , # 2, # 1, and # 3, the gasoline injection signals are corrected, and the LPG injection time is calculated. The calculation of the LPG injection time is performed according to the following calculation formula (1).
[LPG injection time] = [gasoline injection time] * [various correction factors] (1)
In other words, the LPG ECU 3 in FIG. 2 shows the gasoline injection signal (corresponding to the fourth cylinder # 4 before the second injection with respect to the LPG injection time C ′ of the first cylinder # 1). Pulse width (ON time)) C is obtained by multiplying "various correction coefficients". Regarding the LPG injection time D ′ of the third cylinder # 3, the “pulse width (ON time)” D of the gasoline injection signal output corresponding to the second cylinder # 2 before two injections is “various” It is obtained by multiplying by “correction coefficient”. Regarding the LPG injection time A ′ of the fourth cylinder # 4, the “pulse width (ON time)” A of the gasoline injection signal output corresponding to the first cylinder # 1 before two injections is “various”. It is obtained by multiplying by “correction coefficient”. Regarding the LPG injection time B ′ of the second cylinder # 2, the “pulse width (ON time)” B of the gasoline injection signal output corresponding to the third cylinder # 3 before two injections is “various” It is obtained by multiplying by “correction coefficient”.
Here, the “various correction coefficients” mean correction coefficients for adaptation from gasoline to LPG determined according to the temperature state and pressure state of the LPG actually detected by the various sensors 36 to 39.
Then, the LPG ECU 3 performs the above calculated LPG injection at the start of output of the current gasoline injection signals A, B, C, D output corresponding to the cylinders # 1, # 3, # 4, and # 2. The LPG injection signal based on the times C ′, D ′, A ′, and B ′ starts to be output to the LPG injector 6 corresponding to the cylinders # 1, # 3, # 4, and # 2.
[0033]
For example, the LPG ECU 3 uses the gasoline ECU 2 to perform the LPG injection of the first cylinder # 1 indicated by “C ′” in FIG. 3B, as indicated by “C” in FIG. The previous gasoline injection signal output corresponding to the fourth cylinder # 4 before one injection is corrected for conformity to the LPG to obtain an LPG injection time (C '). Then, the LPG ECU 3 outputs an LPG injection signal corresponding to the LPG injection time (C ′) to the LPG injector 6 corresponding to the first cylinder # 1 at the start of output of the current gasoline injection signal (A). As a result, LPG injection is started in the first cylinder # 1. The same applies to the LPG injection of the other cylinders # 3, # 4, and # 2.
[0034]
Here, the processing content of the LPG injection executed by the LPG ECU 3 will be described with reference to FIGS. FIG. 4 is a flowchart showing a process performed in synchronization with the start of output (ON timing) of a gasoline injection signal A output from the gasoline ECU 2 corresponding to the first cylinder # 1.
[0035]
First, in step 100, the LPG ECU 3 reads the ON time of the gasoline injection signal A of the first cylinder # 1, that is, the time at the timing a1 shown in FIG. 3, and stores it in the memory.
[0036]
Next, at step 110, the LPG ECU 3 reads the gasoline injection time (ON time) C stored in the memory 360 ° CA before the gasoline injection signal of the fourth cylinder # 4 from the memory.
[0037]
Next, at step 120, the LPG ECU 3 calculates an LPG injection time C ′ according to the following equation (2).
C ′ = C * [various correction coefficients] (2)
[0038]
Next, at step 130, the LPG ECU 3 starts energizing the LPG injector 6 of the first cylinder # 1.
[0039]
In step 140, the LPG ECU 3 sets the end of energization to the LPG injector 6 of the first cylinder # 1 after elapse of the LPG injection time C ′ from the start of energization in step 130.
[0040]
FIG. 5 is a flowchart showing processing performed in synchronization with the end of the output of the gasoline injection signal output from the gasoline ECU 2 corresponding to the first cylinder # 1 (OFF timing).
[0041]
First, at step 150, the LPG ECU 3 reads the OFF time of the gasoline injection signal A of the first cylinder # 1, that is, the time at the timing a2 shown in FIG.
[0042]
Next, in step 160, the LPG ECU 3 calculates the injection time (ON time) A of the gasoline injection signal of the first cylinder # 1 according to the following equation (3), and stores the result in the memory.
A = (# 1 OFF time) − (# 1 ON time) (3)
[0043]
The LPG ECU 3 thus executes the process for LPG injection related to the first cylinder # 1.
[0044]
FIG. 6 is a flowchart showing a process performed in synchronization with the start of output (ON timing) of the gasoline injection signal B output from the gasoline ECU 2 corresponding to the third cylinder # 3.
[0045]
First, at step 200, the LPG ECU 3 reads the ON time of the gasoline injection signal B of the third cylinder # 3, that is, the time of the timing b1 shown in FIG. 3, and stores it in the memory.
[0046]
Next, at step 210, the LPG ECU 3 reads the gasoline injection time (ON time) D stored in the memory before 360 ° CA for the gasoline injection signal of the second cylinder # 2 from the memory.
[0047]
Next, at step 220, the LPG ECU 3 calculates an LPG injection time D ′ according to the following equation (4).
D ′ = D * [various correction coefficients] (4)
[0048]
Next, at step 230, the LPG ECU 3 starts energizing the LPG injector 6 of the third cylinder # 3.
[0049]
In step 240, the LPG ECU 3 sets the end of energization to the LPG injector 6 of the third cylinder # 3 after elapse of the LPG injection time D ′ from the energization start in step 230.
[0050]
FIG. 7 is a flowchart showing processing performed in synchronism with the end of output of the gasoline injection signal output corresponding to the third cylinder # 3 from the gasoline ECU 2 (OFF timing).
[0051]
First, at step 250, the LPG ECU 3 reads the OFF time of the gasoline injection signal B of the third cylinder # 3, that is, the timing b2 shown in FIG.
[0052]
Next, at step 260, the LPG ECU 3 calculates the injection time (ON time) B of the gasoline injection signal of the third cylinder # 3 according to the following equation (5), and stores the result in the memory.
B = (# 3 OFF time) − (# 3 ON time) (5)
[0053]
The LPG ECU 3 thus executes the process for LPG injection related to the third cylinder # 3.
[0054]
FIG. 8 is a flowchart showing a process performed in synchronism with the start of output (ON timing) of the gasoline injection signal C output from the gasoline ECU 2 corresponding to the fourth cylinder # 4. The processing conforms to FIGS. 4 and 6 described above. FIG. 9 is a flowchart showing the processing performed in synchronization with the end of the output of the gasoline injection signal output from the gasoline ECU 2 corresponding to the fourth cylinder # 4 (OFF timing). Corresponds to FIGS. 5 and 7 described above.
FIG. 10 is a flowchart showing a process performed in synchronism with the start of output (ON timing) of the gasoline injection signal D output from the gasoline ECU 2 corresponding to the second cylinder # 2, in steps 400 to 440. The processing conforms to FIGS. 4, 6 and 8 described above. FIG. 11 is a flowchart showing a process performed in synchronism with the end of output of the gasoline injection signal output from the gasoline ECU 2 corresponding to the second cylinder # 2 (OFF timing). Corresponds to FIGS. 5, 7, and 9 described above.
Here, the description regarding FIGS.
[0055]
FIG. 12 shows data allocation in the memory (RAM) of the LPG ECU 3. The RAM stores the gasoline injection signal ON time (output start time) corresponding to each cylinder # 1, # 3, # 4, and # 2. Similarly, in the RAM, ON times (gasoline injection times) A to D of the gasoline injection signal are stored corresponding to the cylinders # 1, # 3, # 4, and # 2.
[0056]
According to the LPG injection control device for an engine of the present embodiment described above, a series of intake strokes, compression strokes, expansion strokes and exhaust strokes are sequentially repeated while being shifted from each other for each cylinder # 1 to # 4. In the gasoline engine 1 to be operated, the operation state is detected by various sensors 31 to 35. Based on the detected operating state, the gasoline ECU 2 calculates the gasoline injection times A to D as the gasoline injection amounts to be supplied to the cylinders # 1 to # 4. Is output as a gasoline injection signal at the beginning of the intake stroke. In the LPG ECU 3, the gasoline injection signal output for each of the cylinders # 1 to # 4 is corrected for conformity to the LPG and is sequentially output to the LPG injector 6 for each of the cylinders # 1 to # 4 as an LPG injection signal. Then, each LPG injector 6 performs LPG injection.
[0057]
Here, in the LPG ECU 3, the cylinders # 4, # 2, # 1, and # 2 before the two injections from the gasoline ECU 2 are performed for the current LPG injection of a certain cylinder # 1, # 3, # 4, and # 2. The gasoline injection signals C, D, A, and B output last time corresponding to 3 are corrected for conformity to the LPG, and LPG injection times C ′, D ′, A ′, and B ′ are calculated. Then, the LPG ECU 3 calculates the above from the start of output (ON timing) of the current gasoline injection signal output from the gasoline ECU 2 corresponding to the cylinders # 1, # 3, # 4, and # 2. The LPG injection signals corresponding to the cylinders # 1, # 3, # 4, and # 2 having the LPG injection signal based on the LPG injection times C ′, D ′, A ′, and B ′ are output. Therefore, the start of LPG injection for a certain cylinder # 1, # 3, # 4, # 2 is synchronized with the start of output of a gasoline injection signal for that cylinder # 1, # 3, # 4, # 2. In all the cylinders # 1, # 3, # 4, and # 2, LPG injection is started before the intake stroke. For this reason, the LPG injection delay can be prevented in all cylinders, and the output reduction of the engine 1 can be suppressed.
[0058]
In this embodiment, in order to adapt the gasoline injection signal to the LPG, the gasoline injection signal is corrected according to the temperature state and pressure state of the LPG actually detected by the various sensors 36 to 39. An accurate LPG injection signal can be obtained, and the accuracy of LPG injection control can be improved.
[0059]
[Second Embodiment]
Next, a second embodiment of the gasoline alternative fuel injection control device for an engine according to the present invention will be described in detail with reference to the drawings. In this embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and different points are mainly described below.
[0060]
This embodiment differs from the first embodiment in which independent injection is performed in that LPG injection is performed by group injection for a four-cylinder engine 1.
FIG. 13 is a block diagram showing an electrical configuration related to LPG injection control of this engine system. Of the output terminals 41a to 41d of the gasoline ECU 2, the output terminals 41a and 41c corresponding to the first cylinder # 1 and the fourth cylinder # 4 are connected in parallel to the input terminals 42a and 42c of the LPG ECU 3, respectively. The In the LPG ECU 3, the output terminals 43a to 43d are connected to the LPG injectors 6 provided for the cylinders # 1, # 3, # 4, and # 2, respectively. The signals at the output terminals 43a and 43b corresponding to the first cylinder # 1 and the third cylinder # 3 are connected inside the ECU 3, and the signals at the output terminals 43c and 43d for the fourth cylinder 4 # and the second cylinder # 2. Are also connected inside the ECU 3. In this embodiment, the first and third cylinders # 1 and # 3 are set as the first cylinder group, and LPG injection is simultaneously performed from the corresponding LPG injectors 6. Similarly, LPG injection is simultaneously performed from the LPG injectors 6 corresponding to the fourth and second cylinders # 4 and # 2 as the second cylinder group.
[0061]
FIGS. 14A and 14B show the relationship between the gasoline injection signal output from the gasoline ECU 2 and the LPG injection signal output from the LPG ECU 3 in a time chart corresponding to each cylinder group. In this time chart, LPG group injection is performed in the order of the first cylinder group including the first and third cylinders # 1 and # 3 and the second cylinder group including the fourth and second cylinders # 4 and # 2. In FIG. 14A, rectangles with “A, B” indicate gasoline injection signals corresponding to the first cylinder # 1 and the fourth cylinder # 4, and in FIG. 14B, “B ′, A”. The rectangles marked with “′” indicate LPG injection signals corresponding to the first cylinder group and the second cylinder group, and the difference in length indicates the difference in injection time.
[0062]
In this embodiment, the LPG ECU 3 adapts the previous gasoline injection signal output from the gasoline ECU 2 corresponding to the cylinder before two injections to the LPG for the current LPG injection of a certain cylinder group. Therefore, the LPG injection time as the LPG injection amount is calculated with correction. The LPG ECU 3 outputs an LPG injection signal based on the calculated LPG injection time from the start of output of the current gasoline injection signal output corresponding to the certain cylinder group from the gasoline ECU 2. It outputs to the two LPG injectors 6 corresponding to the cylinder of a group.
[0063]
That is, in order to perform LPG injection for a certain cylinder group, the LPG ECU 3 corrects the gasoline injection signal of the cylinder before the two injection timing by the normal independent injection (in the case of the 4-cylinder engine 1 before 360 ° CA). To calculate the LPG injection time. The calculation of the LPG injection time is the same as that of the calculation formula (1).
That is, in FIG. 13, the LPG ECU 3 performs the fourth injection before the second injection than the first cylinder # 1 for the LPG injection time B ′ of the first cylinder group including the first and third cylinders # 1 and # 3. This is obtained by multiplying the pulse width (ON time) B of the gasoline injection signal output corresponding to cylinder # 4 by “various correction coefficients”. Regarding the LPG injection time A ′ of the second cylinder group including the fourth and second cylinders # 4 and # 2, the gasoline output corresponding to the first cylinder # 1 before the second injection than the fourth cylinder # 4 It is obtained by multiplying the pulse width (ON time) A of the injection signal by “various correction coefficients”.
Then, the LPG ECU 3 synchronizes with the start of output of the current gasoline injection signals A and B output corresponding to a certain cylinder group, and generates an LPG injection signal based on the calculated LPG injection times B ′ and A ′. Are output to the LPG injectors 6 corresponding to the cylinders # 1 to # 4 of the cylinder group.
[0064]
For example, the LPG ECU 3 has two gasoline ECUs 2 as shown by “B” in FIG. 14A for LPG injection of the first cylinder group indicated by “B ′” in FIG. The previous gasoline injection signal output corresponding to the fourth cylinder # 4 before injection is corrected for conformity to the LPG and is set as an LPG injection time B ′. The LPG ECU 3 simultaneously outputs an LPG injection signal corresponding to the LPG injection time B ′ to the two LPG injectors 6 of the cylinders of the first cylinder group at the start of the output of the current gasoline injection signal (A). Thereby, LPG injection is started in the first cylinder group. The same applies to the LPG injection of the second cylinder group.
[0065]
Here, the processing content of the LPG injection executed by the LPG ECU 3 will be described with reference to FIGS. FIG. 15 is a flowchart showing processing performed in synchronization with the start of output (ON timing) of the gasoline injection signal A output from the gasoline ECU 2 corresponding to the first cylinder # 1.
[0066]
First, at step 500, the LPG ECU 3 reads the ON time of the gasoline injection signal A of the first cylinder # 1, that is, the time at the timing a1 shown in FIG. 14, and stores it in the memory.
[0067]
Next, at step 510, the LPG ECU 3 reads the gasoline injection time (ON time) B stored in the memory before 360 ° CA as the gasoline injection signal of the fourth cylinder # 4 from the memory.
[0068]
Next, at step 520, the LPG ECU 3 calculates an LPG injection time B ′ according to the following equation (6).
B ′ = B * [various correction coefficients] (6)
[0069]
Next, at step 530, the LPG ECU 3 starts energizing the LPG injector 6 of the first cylinder group including the first and third cylinders # 1 and # 3.
[0070]
In step 540, the LPG ECU 3 sets the end of energization to the LPG injectors 6 of the first and third cylinders # 1 and # 3 after the LPG injection time B ′ has elapsed from the start of energization in step 530.
[0071]
FIG. 16 is a flowchart showing processing performed in synchronization with the end of output of the gasoline injection signal output corresponding to the first cylinder # 1 from the gasoline ECU 2 (OFF timing).
[0072]
First, at step 550, the LPG ECU 3 reads the OFF time of the gasoline injection signal A of the first cylinder # 1, that is, the time at the timing a2 shown in FIG.
[0073]
Next, at step 560, the LPG ECU 3 calculates the injection time (ON time) A of the gasoline injection signal of the first cylinder # 1 according to the following equation (7), and stores the result in the memory.
A = (# 1 OFF time) − (# 1 ON time) (7)
[0074]
The LPG ECU 3 thus executes the process for LPG injection related to the first cylinder group.
[0075]
FIG. 17 is a flowchart showing a process performed in synchronism with the start of output (ON timing) of the gasoline injection signal B output from the gasoline ECU 2 corresponding to the fourth cylinder # 4. The processing conforms to FIG. 15 described above. FIG. 18 is a flowchart showing a process performed in synchronization with the end of the output of the gasoline injection signal output from the gasoline ECU 2 corresponding to the fourth cylinder # 4 (OFF timing). Corresponds to FIG. 16 described above. Here, the description regarding FIGS. 17 and 18 is omitted.
[0076]
FIG. 19 shows data allocation in the memory (RAM) of the LPG ECU 3. The RAM stores the gasoline injection signal ON time (output start time) corresponding to the first cylinder # 1 and the fourth cylinder # 4. Similarly, the RAM stores the gasoline injection signal ON times (gasoline injection times) A and B corresponding to the first cylinder # 1 and the fourth cylinder # 4.
[0077]
According to the LPG injection control device for an engine of the present embodiment described above, the LPG ECU 3 outputs from the gasoline ECU 2 corresponding to the cylinders before two injections for the current LPG injection of a certain cylinder group. The previous gasoline injection signal is corrected for conformity to the LPG, and the LPG injection times B ′ and A ′ are calculated. In the LPG ECU 3, the calculated LPG injection time B ′, A ′ from the start of output of the current gasoline injection signal (A, B) output corresponding to a certain cylinder group from the gasoline ECU 2 The based LPG injection signal is output to the two LPG injectors 6 corresponding to the cylinders of a certain cylinder group. Accordingly, the start of LPG injection in two cylinders of a certain cylinder group is synchronized with the start of output of a gasoline injection signal for those cylinders, and LPG injection is started before the intake stroke in all cylinders. . For this reason, it is possible to prevent the LPG injection delay in all the cylinders and suppress the output reduction of the engine 1. Other operations and effects are basically the same as those of the first embodiment.
[0078]
The present invention is not limited to the above-described embodiments, and can be carried out as follows without departing from the spirit of the invention.
[0079]
(1) In the first embodiment, as shown in FIGS. 3A and 3B, for the current LPG injection of a certain cylinder # 1 to # 4, a certain cylinder # 1 is supplied from the gasoline ECU 2. The LPG injection time is calculated by correcting the previous gasoline injection signal output corresponding to the cylinders # 1 to # 4 before the two injections 1 to # 4 for conformity to the LPG. On the other hand, as shown in FIGS. 20A and 20B, for the current LPG injection of a certain cylinder (first cylinder # 1), a certain cylinder (first cylinder # 1) is supplied from the gasoline ECU 2. The LPG injection time A ′ is calculated by correcting the gasoline injection signal A four times before output corresponding to the previous four cylinders (first cylinder # 1) for conformity to the LPG. Also good. Also in this case, since the start of LPG injection can be matched with the beginning of the intake stroke, LPG injection delay can be prevented in all the cylinders, and an effect that the output reduction of the engine 1 can be suppressed.
[0080]
(2) In each of the above embodiments, the gasoline alternative fuel injection control device for an engine of the present invention is embodied in the 4-cylinder engine 1, but it is also embodied in a 2-cylinder engine other than the 4-cylinder engine or a 6-cylinder engine. Can do.
[0081]
(3) In each of the above embodiments, the gasoline alternative fuel injection control device of the engine of the present invention is applied to a monofuel type engine system dedicated to LPG. However, in the bifuel type engine system for switching between gasoline and LPG, Can also be applied.
[0082]
(4) In the above embodiment, the gasoline alternative fuel injection control device of the engine of the present invention is embodied as an LPG injection control device using LPG as gasoline alternative fuel, but LNG injection using LNG as gasoline alternative fuel. It can also be embodied in a control device.
[0083]
【The invention's effect】
According to the configuration of the first aspect of the present invention, the gasoline alternative fuel injection control unit includes the gasoline alternative fuel injection unit. Control the shooting In order to adapt the gasoline injection signal output from the gasoline injection control unit for the cylinder corresponding to the previous injection sequence to the gasoline alternative fuel for the current gasoline alternative fuel injection of a cylinder. Based on the calculated gasoline alternative fuel injection amount from the start of output of the current gasoline injection signal output corresponding to the cylinder from the gasoline injection control unit. A gasoline alternative fuel injection signal is output to an injector corresponding to the certain cylinder. Therefore, gasoline alternative fuel injection in a certain cylinder is matched at the start of output of a gasoline injection signal for that cylinder, and gasoline alternative fuel injection is started before the intake stroke in all cylinders. As a result, independent injection is performed, and it is possible to prevent the delay in injection of alternative fuel for gasoline in all the cylinders and to suppress the decrease in engine output.
[0084]
According to the configuration of the invention described in claim 2, the gasoline alternative fuel injection control unit includes the gasoline alternative fuel injection control unit. Control the shooting For this time, the gasoline injection signal output from the gasoline injection control unit corresponding to the cylinder corresponding to the previous injection sequence for the gasoline alternative fuel injection of a certain cylinder group is applied to the gasoline alternative fuel. Therefore, the calculated gasoline alternative fuel injection amount is calculated from the start of output of the current gasoline injection signal output corresponding to the cylinder group from the gasoline injection control unit. A gasoline alternative fuel injection signal based on the injection amount is output to an injector corresponding to a plurality of cylinders of the certain cylinder group. Therefore, the start of gasoline alternative fuel injection in a plurality of cylinders of a certain cylinder group is aligned with the start of output of the gasoline injection signal for those cylinders, and gasoline alternative fuel injection is started before the intake stroke in all cylinders. Become. As a result, group injection is performed, and it is possible to prevent the delay in injection of alternative fuel for gasoline in all the cylinders and to suppress the decrease in engine output.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram illustrating an engine system according to a first embodiment.
FIG. 2 is a block diagram showing an electrical configuration related to LPG injection control.
FIGS. 3A and 3B are time charts showing the relationship between a gasoline injection signal and an LPG injection signal corresponding to each cylinder.
FIG. 4 is a flowchart showing an LPG injection process related to the first cylinder.
FIG. 5 is a flowchart showing an LPG injection process related to the first cylinder.
FIG. 6 is a flowchart showing an LPG injection process related to the third cylinder.
FIG. 7 is a flowchart showing an LPG injection process related to the third cylinder.
FIG. 8 is a flowchart showing an LPG injection process related to the fourth cylinder.
FIG. 9 is a flowchart showing an LPG injection process related to the fourth cylinder.
FIG. 10 is a flowchart showing an LPG injection process related to the second cylinder.
FIG. 11 is a flowchart showing an LPG injection process related to the second cylinder.
FIG. 12 is an explanatory diagram showing data allocation in a memory.
FIG. 13 is a block diagram showing an electrical configuration related to LPG injection control according to the second embodiment.
14A and 14B are time charts showing the relationship between a gasoline injection signal and an LPG injection signal corresponding to each cylinder.
FIG. 15 is a flowchart showing an LPG injection process related to the first cylinder.
FIG. 16 is a flowchart showing an LPG injection process related to the first cylinder.
FIG. 17 is a flowchart showing an LPG injection process related to the fourth cylinder.
FIG. 18 is a flowchart showing an LPG injection process related to the fourth cylinder.
FIG. 19 is an explanatory diagram showing data allocation in a memory.
FIGS. 20A and 20B are time charts showing a relationship between a gasoline injection signal and an LPG injection signal corresponding to each cylinder according to another embodiment.
FIG. 21 is a schematic configuration diagram showing a conventional engine system.
FIGS. 22A and 22B are time charts showing a relationship between a gasoline injection signal and an LPG injection signal corresponding to each cylinder in the group injection type, according to a conventional example.
FIGS. 23A and 23B are time charts showing a relationship between a gasoline injection signal and an LPG injection signal corresponding to each cylinder of the independent injection type, according to a conventional example.
[Explanation of symbols]
1 Gasoline engine
2 ECU for gasoline (gasoline injection control unit)
3 LPG ECU (Gasoline alternative fuel injection control unit)
6 LPG injector
31 Throttle sensor
32 Intake pressure sensor
33 Water temperature sensor
34 Rotational speed sensor
35 Oxygen sensor (31-35 is equivalent to a driving | running state detection means)
# 1 1st cylinder
# 2 Cylinder 2
# 3 Cylinder 3
# 4 4th cylinder
Q1 Gasoline injection signal for the first cylinder
Q2 No. 2 gasoline injection signal
Q3 3rd cylinder gasoline injection signal
Q4 4th cylinder gasoline injection signal

Claims (2)

An engine that includes a plurality of cylinders and operates to sequentially repeat a series of intake strokes, compression strokes, expansion strokes, and exhaust strokes for each of the cylinders;
A plurality of injectors for injecting and supplying gasoline alternative fuel for each cylinder;
An operating state detecting means for detecting the operating state of the engine;
A gasoline injection amount to be supplied to a cylinder corresponding to a predetermined injection order is calculated based on the detected operating state, and the calculated gasoline injection amount is output as a gasoline injection signal at the beginning of the intake stroke of each cylinder. A gasoline injection control unit for
Gasoline alternative fuel injector for the sequentially output to the injector of each cylinder gasoline injection signal output said each cylinder from said gasoline injection control unit as gasoline alternative fuel injection signal is corrected for adaptation to alternative fuel to gasoline In a gasoline alternative fuel injection control device for an engine comprising a gasoline alternative fuel injection control unit for performing control,
The gasoline alternative fuel injection control unit, when performing the gasoline alternative fuel jetting control, for this gasoline alternative fuel injector of a cylinder, corresponding from the gasoline injection control unit to the previous previous ejection order This time the gasoline injection control unit calculates the gasoline alternative fuel injection amount by correcting the gasoline injection signal output corresponding to the cylinder to match the gasoline alternative fuel, and the gasoline injection control unit outputs it corresponding to the certain cylinder. A gasoline alternative fuel injection control device for an engine which outputs a gasoline alternative fuel injection signal based on the calculated gasoline alternative fuel injection amount to an injector corresponding to the certain cylinder from the start of output of the gasoline injection signal of the engine . An engine that includes a plurality of cylinders and operates to sequentially repeat a series of intake strokes, compression strokes, expansion strokes, and exhaust strokes for each of the cylinders;
A plurality of injectors for injecting and supplying gasoline alternative fuel for each cylinder;
An operating state detecting means for detecting the operating state of the engine;
A gasoline injection amount to be supplied to a cylinder corresponding to a predetermined injection order is calculated based on the detected operating state, and the calculated gasoline injection amount is calculated at the beginning of an intake stroke of some of the cylinders. A gasoline injection control unit for outputting as a gasoline injection signal;
The gasoline injection signal output from the gasoline injection control unit for each of the some cylinders is corrected for conformity to gasoline alternative fuel, and is used as a gasoline alternative fuel injection signal from at least two cylinders including the some cylinders. In a gasoline alternative fuel injection control device for an engine comprising a gasoline alternative fuel injection control unit for performing gasoline alternative fuel injection control for sequentially outputting to an injector for each cylinder group,
The gasoline alternative fuel injection control unit, when performing the gasoline alternative fuel jetting control, for this gasoline alternative fuel injector of a cylinder group, corresponding to the last previous ejection order from the gasoline injection control unit The gasoline injection signal output corresponding to the cylinder to be corrected is corrected for conformity to the gasoline alternative fuel, the gasoline alternative fuel injection amount is calculated, and the gasoline injection control unit corresponds to the cylinder group. A gasoline alternative fuel injection signal based on the calculated gasoline alternative fuel injection amount is output to a plurality of injectors corresponding to the cylinders of the certain cylinder group from the start of output of the current gasoline injection signal to be output. A gasoline alternative fuel injection control device for engines.

Images