JPH0370852A - Starter auxiliary device of alcohol engine - Google Patents

Abstract

PURPOSE:To improve starting property without the increase of the capacity of a battery by providing a starting control device for comparing a necessary calorific value calculated by a necessary calorific value calculating means with a determined standard value, energizing a heating means for a determined time when the necessary calorific value is larger than the standard value, and then driving a starter motor. CONSTITUTION:Whether an engine can be started or not is judged by a start possibility judging means 53 on the basis of alcohol concentration in fuel and engine temperature. When start impossibility is judged, then, a necessary calorific value of heating means 23, 24 for accelerating evaporation of the fuel to enable the start is calculated by a necessary calorific value calculating means 56 on the basis of the alcohol concentration and engine temperature. Then, the necessary calorific value of the heating means 23, 24 is compared with a determined standard value by a starting control means 57, and when this necessary calorific Value is larger than the standard value, the heating means 23, 24 are energized for a determined time, and then a starter motor is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a starting assist device for an alcohol engine that facilitates starting by promoting vaporization of fuel supplied to the engine at the time of starting.

[Problems to be solved by conventional technology and inventions] In recent years, due to worsening fuel conditions and demands for exhaust purification, systems that can simultaneously use alcohol as an alternative fuel in addition to conventional gasoline have been put into practical use. Vehicles such as automatic LR equipped with this system V4 (Flexible
Fuel Vehicles (hereinafter referred to as rFFVJs) can run on not only gasoline, but also a mixture of alcohol and gasoline, or only alcohol. The alcohol content varies between 0% (gasoline only) and 100% (alcohol only) depending on the user's circumstances when refueling.

In general, compared to gasoline fuel, alcohol fuel
It has characteristics such as being difficult to vaporize at low temperatures, having a large latent heat of vaporization, and a high flash point, and when the alcohol concentration changes, the output characteristics will change significantly depending on the temperature conditions.
In particular, if the alcohol concentration is high, the problem arises that low-temperature startability becomes poor.

To deal with this, a technique has been known that uses heating means such as a heater to promote vaporization of fuel and improve startability.
A technique is disclosed in which a 110 heating device that heats the intake passage is controlled based on the output of an alcohol I sensor, and the amount of heat generated by the heating device R is increased when the alcohol concentration is above a set value.

However, the above j111 that allows the engine to be started
The required calorific value of the heating device varies greatly depending on the engine temperature, and if the calorific value of the heating means is determined solely based on the alcohol concentration, as in the preceding example, there is a risk that it will not be possible to cope with starting at low temperatures. .

Furthermore, increasing the amount of heat generated at low temperatures increases power consumption, making it impossible to drive the starter motor together at low temperatures when the battery capacity decreases, and the battery capacity must be significantly increased.

[Object of the Invention] The present invention has been made in view of the above circumstances, and it sets the required calorific value of the heating means based on the alcohol concentration and engine temperature, and takes into account the consumption gravity for this required calorific value. The object of the present invention is to provide a starting assist device for an alcohol engine that can perform optimal control and improve starting performance without increasing battery capacity.

[Means and Effects for Solving the Problems] To achieve the above object, the alcohol engine starting assist device according to the present invention provides a starting aid that determines whether or not the engine can be started based on the alcohol concentration of the fuel and the engine temperature. When it is determined that the start is not possible by the start possibility determining means and the start possibility determining means, the necessary calorific value of the heating means that promotes vaporization of the fuel to enable the start is determined to be zero based on the alcohol concentration and the engine temperature. Comparing the required calorific value calculated by the heat generation tonne calculation means and the required light heat amount calculation means with a predetermined reference value, and when the required calorific value is larger than the reference value, energizing the heating means for a predetermined time; Thereafter, the starter motor includes a starting control means for driving the starter motor.

That is, the startability determining means determines whether or not the engine can be started based on the alcohol concentration of the fuel and the engine temperature, and if it is determined that the engine cannot be started, heating is performed to promote vaporization of the fuel to enable the engine to be started. The necessary calorific value of the means is calculated by the necessary heat generation rfftn output means based on the alcohol content and the engine temperature.

Then, the starting control means compares the necessary calorific value of the heating means with a predetermined reference value, and when the required calorific value is larger than the reference value, the heating means is energized for a predetermined time, and then the starter is turned on. The motor is driven.

[Embodiments of the invention] Hereinafter, the present invention will be described in detail with reference to the drawings.

1 to 5 show a first embodiment of the present invention, FIG. 1 is a functional block diagram of a control device, FIG. 2 is a schematic diagram of an engine control system, and FIG. 3 is an explanation of a startability determination map. 4 is an explanatory diagram of a fuel injection amount map at the time of starting, and FIG. 5 is a flowchart showing the control procedure at the time of starting.

(Configuration of Engine Control System) In FIG. 2, reference numeral 1 is an alcohol engine for FFV, and the figure shows a horizontally opposed four-cylinder engine. An intake manifold 3 is communicated with the intake bow 1-28 formed in the cylinder head 2 of the engine 1, a throttle chamber 5 is communicated with the intake manifold 3 via an air chamber 4, and an intake pipe is connected upstream of the throttle chamber 5. An air cleaner 7 is attached via 6.

In addition, an intake air star sensor (in the figure, a hot wire type air 7
An injector 10 is installed upstream of the throttle valve 5a provided in the throttle chamber 5. This injector 10 connects to the fuel tank via a fuel supply path 11. 12, and this fuel tank 12 contains fuels with different alcohol concentrations (%) depending on the user's refueling circumstances, such as alcohol only, a mixed fuel of alcohol and gasoline, or gasoline only. is stored.

Further, a fuel pump 13 and an alcohol concentration sensor 14 are interposed in the fuel supply path 11 from the fuel tank 12 side, and the injector 10 is connected to the fuel chamber 18a of the pressure regulator 18 via the return path 16. is communicated with.

The pressure regulator 18 includes the fuel chamber 18a.
The downstream side communicates with the fuel tank 12, and the pressure regulating chamber 18b communicates with the immediately upstream side of the throttle valve 5a, and the pressure regulator 18 controls the fuel pressure in the fuel supply path 11 and the The differential pressure with the pressure immediately upstream of the throttle valve 5a is kept constant, and the fuel injection star from the injector 10 is controlled so as not to fluctuate.

Further, a spark plug 17 is attached to each cylinder of the cylinder head 2, the tip of which is exposed to the combustion chamber.
A crank rotor 21 is pivotally attached to the crankshaft 1b of the engine 1, and a crank angle sensor 22 consisting of an electromagnetic pickup or the like for detecting a crank angle is provided on the outer periphery of the crank rotor 21.

In addition, the air chamber 4 of the intake manifold 3
A heating means consisting of a first heater 23 and a second heater 24 is installed at the bottom, and the riser formed in the intake manifold 3 is connected to a cooling water passage (not shown).
A cold fJl water temperature sensor 25 is facing.

Roughly speaking, an 02 sensor 27 faces the exhaust pipe 26 communicating with the exhaust boat 2b of the cylinder head 2. Note that reference numeral 028 is a catalytic converter.

(Circuit configuration of control device) On the other hand, reference numeral 31 is a control device, and the CP of this control device 31 is
U (Central processing I! I! unit) 32. ROM33, R
The AM 34 and the I10 interface 35 are connected to each other via a pass line 36, and are supplied with a predetermined stabilized voltage from a constant voltage circuit 37.

The constant voltage circuit 37 is connected to a relay contact 408 of an ignition relay 40 connected to a battery 39 via an ignition switch 38, and is supplied with power for control. 38 is configured to supply backup power when O"".

The battery 39 also includes a starter switch 41,
The relay contact 42a of the first heater relay 42 and the second
A relay contact 43a of a heater relay 43 is connected, and a starter motor 45 is further connected to the starter switch 41 via a relay contact 44a of a starter motor relay 44.

The input port of the I10 interface 35 also includes the sensors 8, 14, . ．． Sensors such as 22, 25° 27, etc. are connected, as well as the relay contact 40a of the ignition relay 40 and the starter switch 4.
Switches such as 1 are connected.

Further, the spark plug 17 is connected to the output boat of the I10 interface 35 via an igniter 29, and the injector 10 and fuel pump 13 are connected via a drive circuit 46. A relay 42, a second heater relay 43, a starter motor relay 44, and an LED 47 serving as heater heating display means are connected.

The above ROM33 contains a control program, a start possibility determination map MPST, which will be described later, and a starting fuel injection spear map M.
Fixed data such as p FST is stored, and
The RAM 34 stores the output signals of the sensors and switches after data processing and the data processed by the CPU 32.

Also, according to the control program stored in the ROM 33, when starting the engine, the CPtJ32
Start-up control is performed based on the engine condition parameters detected by the above-mentioned sensors and switches, and the alcohol moisture content of the fuel detected by the alcohol moisture sensor 14, and the control is performed to the first heater 23 and the second heater 24. The energization of the injector 10 is controlled to promote vaporization of the fuel injected from the injector 10, thereby making it possible to start the engine easily.

After starting the engine, the control shifts to normal control, calculates fuel injection distance, ignition timing, etc., and outputs a drive pulse width signal to the injector 10, an ignition signal S1 to the spark plug 17, etc.

(Functional configuration of control device) As shown in FIG.
The function related to @ is the starter switch state determination means 51.
, alcohol concentration calculation means 52, startability determination means 53
, startability determination map MPST.

Latent heat of vaporization calculation means 54, fuel flow rate calculation means 55, starting fuel injection amount map MPFST, required calorific value calculation means 56
, and starting control means 57.

Further, the start control means 57 includes a reference value comparison means 57a.
1 timer means 57b, starter motor drive means 57c,
First heater drive means 57d, second heater drive means 57e
It consists of

The starter switch state determining means 51 determines whether the stator switch 41 is on or off, and when the starter switch 41 is turned on, outputs a trigger signal to the start possibility determining means 53. Further, when the starter switch 41 is turned off, the starter modal relay 44 is turned off via the starter motor drive means 57c, and the first heater relay 42 is turned off via the first heater drive means 57d.
is set to 0FFL, and the first heater 23 is de-energized.

The alcohol concentration calculation means 52 reads the output signal of the alcohol temperature sensor 14 and calculates the alcohol concentration of the fuel to be supplied to the injector 10.

In the start possibility determining means 53, when a trigger signal is input from the starter switch state determining means 51, the alcohol concentration calculating means 52 determines whether
A and the engine temperature based on the coolant rJ+coolant temperature T- from the cooling water temperature sensor 25 as parameters to determine whether or not the engine can be started using the startability determination map MPST.

If it is determined that starting is possible, starter motor drive means 57
The starter motor relay 44 is turned on and the starter motor 45 is turned on via c. On the other hand, if it is determined that the engine cannot be started, a calculation start signal is output to the latent heat of vaporization calculation means 54 and the fuel flow rate calculation means 55.

As shown in FIG. 3, the startability determination map MPST is based on the engine temperature represented by the cooling water UTIA, etc., without heating the fuel injected from the injector 10 by the first heater 23 and the second heater 24. The region of alcohol concentration A where the engine can be started immediately and the region where the engine cannot be started are determined in advance through experiments, and are stored in advance as a map in a series of predetermined addresses in the ROM 33.

Note that instead of the cooling water temperature TH from the cooling water temperature sensor 25, oil temperature, fuel temperature, etc. may be used.

In the latent heat of vaporization calculation means 54, the start possibility determination means 53
Based on the calculation start signal from , the latent heat of vaporization (heat of vaporization) QS is calculated based on the alcohol concentration A calculated by the alcohol 11 degree calculation means 52.

Since this latent heat of vaporization QS is determined by the alcohol concentration A, it can be determined by a function f (A) of the alcohol concentration A (QS = f (A)).

In the fuel flow rate calculation means 55, the start possibility determination means 53
Based on the calculation start signal from
The starting fuel injection lTi is retrieved from the i map M P FST, and the fuel flow rate FL per hour injected from the injector 10 is calculated based on this starting fuel injection amount Ti.

The starting fuel injection amount map M P FST, as shown in FIG. However, it is stored in a series of predetermined addresses in the ROM 33, and since it is necessary to lower the air-fuel ratio when the alcohol 111 degrees A is high, a large value of the starting fuel injection aTi is stored.
Since the cooling water temperature is low and a one-window increment M correction is required, a large value of the starting fuel injection ff1Ti is stored.

The required heat generation 1 output means 56 calculates the fuel flow Ql''L, which is calculated as 0 by the fuel flow rate calculation means 55 based on the alcohol concentration A and the cooling water temperature T-, and the latent heat of vaporization calculation means 54 based on the alcohol concentration. From the calculated latent heat of vaporization QS,
The required calorific value W of the heating means composed of the first heater 23 and the second heater 24 is set to 0 (W = QS x FL ).

In the reference value comparison means 57a, the above-mentioned required calorific value calculation means 5
Compare the required heat generation mW calculated in step 6 with the standard value WS, and find that W≦
In the case of WS, the starter motor relay 44 is turned on via the starter motor drive means 57G, and the first heater relay 42.1E is turned on via the first heater drive means 57d.
Turn on D47, start motor 45 and first heater 2
3 is energized, and LED 4.7 displays the heater heating. On the other hand, if W>WS, a trigger signal is output to the timer means 57b.

The timer means 57b uses a trigger signal from the reference value comparison means 57a to determine whether the time period is 3SEC>the first heater driving means 57d and the second heater driving means 57.
The first heater relay 42 and the second heater relay 43 are ONL, the first heater 23, the second heater 24, and the LED 47 which is a heater heating display means are communicated via e.

During this time, the starter motor relay 44 is turned off.
The starter motor 45 is not driven.

That is, based on the reference value WS, whether the required heat generation amount W calculated by the required heat generation 1 output means 56 can be covered by energizing only the first heater 23, or whether the first heater 2
It is determined whether both the heater 3 and the second heater 24 should be energized, and if the required heat generation amount W is less than the reference value WS, only the first heater 23 is energized, and in this case, since the power consumption is low, The first heater 23 is energized and the starter motor 45 is turned on to immediately start the engine.

On the other hand, if the required calorific value W is larger than the reference value WS, the required calorific value W cannot be obtained unless both the first heater 23 and the second heater 24 are energized;
Moreover, since the power consumption is large, the timer means 57b
The first heater relay 42 and the second heater relay 43 are turned on for a predetermined period of time, and during that time the starter motor 45 is turned on.
(Turn it off.)

(Operation) Next, the operation of the embodiment according to the above II four precepts will be explained based on the flowchart of FIG.

The program shown in the flowchart of FIG. 5 is an initial control program that starts when the starter switch 41 is turned on.First, in step 8101'c, an initial V rise is performed, the counter is initialized to 191, and each relay 42, 43, . The initial state of 44 is determined.

That is, each relay 42, 43, 44 is turned OFF, and then the process proceeds to step 5102, where the cooling water IT-T- from the cooling water temperature sensor 25 is read, and the alcohol c
Alcohol 1 degree A is calculated from the output signal of the J degree sensor 14.

Next, in step 3103, using the cooling water temperature T14 obtained in step 5102 and the calculated alcohol concentration as parameters, it is determined from the startability determination map MPST whether or not the engine can be started.

If it is determined in step 5103 that starting is possible, the process proceeds to step 5104, where the starter motor drive means 57C
The starter motor relay 44 is turned on via the starter motor 45, and in step 3105, it is determined whether or not the starter switch 41 is turned off.

If the starter switch 41 is not OFF, return from step 5ios to step 5104 and continue to turn on the starter motor relay 44; if the starter switch 41 is OFF, step 51
Proceeding from step 05 to step 8106, the starter motor relay 44 is set to 0FFI, the starter motor 45 is set to 0FFL,
Exit the program.

On the other hand, if it is determined in step 5103 that starting is not possible, the process proceeds from step 3103 to step 5107, where the alcohol concentration A calculated in step 5102 is
The latent heat of vaporization QS is calculated based on QS=f(A)), and the process proceeds to step 8108.

In step 8108, a starting fuel injection amount map MP is created using the cooling water UT- and the alcohol concentration A as parameters.
Search the starting fuel injection ff1Ti from FST, and calculate the fuel flow rate per hour F from this starting fuel injection 1fiTi.
Calculate the

Next, proceed to step 5109, and proceed to step 5107 described above.
The latent heat of vaporization Qs calculated in step 810 and the
Required heater heat generation amount W from the fuel flow ff1FL calculated in 8.
Calculate (W=Qs xFL).

Then, in step 5110, the required heater heat generation ff1W calculated in step 5109 is determined! : It is compared with the reference value WS, and it is determined whether it is sufficient to energize only the first heater 23 or whether both the first heater 23 and the second heater 24 must be energized.

If WS≧W, step 5110 to step 5 above
111, the starter motor relay 44 and the first heater relay 42 are turned on, the starter motor 45 is driven, and the first heater 23 is turned on to heat the fuel injected from the injector 10.

At Jii1, the LED 47 is lit to indicate that the heater is energized.

Next, in step 5112, the starter switch 4
1 is turned off, and the starter switch 41 is turned off.
If the starter switch 41 is not OFF, return to step 5111 and continue to turn on the starter motor relay 44, first heater relay 42, and LED 47. If the starter switch 41 is OFF, proceed to step 5112 above.
The process then proceeds to step 5113.

In step 5113, the starter motor relay 44
and the first heater relay 42 to 0FF1. Then, the starter motor 45 is set to 0FFI, the LED 47 is turned off, the heating display is stopped, and the program is ended.

On the other hand, if it is determined in step 110 that WS <W, the process proceeds from step 5110 to step 5114, increments the count value C of the counter by 1, and in step 511
5, the first heater relay 42 and the second heater relay 43
At the same time, the LED 47 is turned on to indicate that the heater is being energized.

Next, in step 8116, it is determined whether the count value C of the counter has reached the set value CI'Il. If C<Cm, the process returns to step 5114 and continues counting; if C≧Cl11, , that is, for a predetermined period of time (for example, 3
SEC> has elapsed, the process advances to step 5117.

In step 5117, the count value C is cleared (CmO
) and proceeds to step 8118, where the first heater relay 42
and the second heater relay 43 is turned off, and the LE
Turn off D47 to stop the heater heating display, and proceed to step 5.
Proceed to 119.

In step 5119, the starter switch 41 is turned off.
The starter switch 41 is set to 0F.
If not, the starter motor relay 44 is turned on in step 5120, and the starter motor 45 is driven until it is determined in step 5119 that the starter switch 41 is turned off.

That is, when the starter switch 41 is turned OFF while the heater is energized,
In the case of F, in order to avoid the starter motor being driven when the energization ends, the starter switch 41 is turned off.
Determine the state of the starter motor relay 44 ii! I
n, and in step 5119 above, the starter switch 41 is
If it is determined that the
Turn off the starter motor relay 44 and end the program.

(Second Embodiment) Figure 6 and subsequent figures show a second embodiment of the present invention, in which Figure 6 is a functional block diagram of the control device, Figure 7 is a schematic diagram of the engine control system, and Figure 8 is a diagram at the time of starting. It is a flowchart which shows a control procedure.

In the second embodiment, the same members and means as in the first embodiment are denoted by the same reference numerals, and the explanation thereof will be omitted.

(Engine control system and control!! (!Structure of device) As shown in FIG. 7, heating means consisting of a heater 20 is installed at the bottom of the air chamber 4 of the intake manifold 3.
This heater 20 is connected via the relay contact 48a of the heater power-on relay 48 and the heater heat generation amount adjustment means 50 consisting of the heater heat generation amount: Jl adjustment relay 49 and the resistor R.
It is connected to a battery 39.

The heater power-on relay 48 and the heater heat output adjustment relay 49 are connected to the drive circuit 46 of the control device 31,
A relay contact 48a of the heater power-on relay 48 is connected to the three batteries, and a connection point where the resistor R and the relay contact 49a of the heater heat generation amount adjustment relay 49 are connected in parallel is connected to the heater power supply. Closing relay 48
is connected to the relay contact 48a.

(Functional Configuration of AI Control Device) As shown in FIG. 6, the functions of the control device 31 related to the secondary leg at the time of starting are a starter switch state determination means 61, an alcohol concentration calculation means 52, a start possible determination means 53, a start possible Judgment map MPST, latent heat of vaporization calculation means 54, fuel flow rate calculation means 55, starting fuel injection suspension map MPFS
The starting control means 62 includes a reference value comparison means 62
a1 timer means 62b1 starter motor drive means 57c
, a heater power-on drive means 62c, and a heater heat generation axis adjustment drive means 62d.

When the starter switch 41 is turned on, the starter switch state determination means 61 outputs a trigger signal ";
Then, the starter motor relay 44 is turned off via the starter motor drive means 57c, and the starter motor 4 is turned off.
5 is turned off, and the heater power is turned on driving means 6.
2c, the heater power-on relay 48 is set to 0FFL to de-energize the heater 20.

The reference value comparison means 62a compares the required heater heat generation amount W determined by the required heat generation amount calculation means 56 with the reference value WS,
If WS≧W, the starter motor relay 44 is turned on via the starter motor drive means 57c to drive the starter motor 45, and the heater power on relay 48 is turned on via the heater power on drive means 62c.

At this time, the heater heat generation adjustment relay 49 is OFF, and the resistance R of the heater heat generation ω adjustment means 50 is transmitted from the battery 39 through the relay contact 48a of the heater power-on relay 48.
The heater 20 generates a low amount of heat by energizing the heater 920. At the same time, the LED 47 is lit to indicate that the heater is heating.

On the other hand, if WS <W, a trigger signal is output to the timer means 62b.

In response to the trigger signal from the reference value comparison means 62a, the timer means 62b turns on the heater power-on relay 48 via the heater power-on drive means 62c for a predetermined period of time (e.g., 3 SEC>), and turns on the heater power-on relay 48 via the heater power-on drive means 62c. Turn on the heater heat generation adjustment relay 49 via
L. The heater 20 is directly connected to the battery 39 to increase the amount of heat generated.

During this time, since the power consumption by the heater 20 is large, the starter motor relay 44 is turned off and the starter motor 4
5 is not driven, and after a predetermined period of time has elapsed, the heater power-on relay 48 and the heater calorific value adjustment relay 49 are turned off to de-energize the heater 20, and the starter motor relay 44 is turned off via the starter motor drive means 57C. O
N, and the starter motor 45 is driven.

(Operation) Next, the operation of the second embodiment is compared to the operation of the first embodiment. The following steps will be explained according to the flowchart of FIG.

When proceeding from step 5101 to step 3110 through the same procedure as in the first embodiment, in step 5110, the required heater heat generation MW is compared with the reference value WS, and if WS≧W, the process proceeds from step 5110 to step 5201. ,
The starter motor relay 44 and the power source IQ relay 48 are turned ONL, and the starter motor 45 is driven, and the heater 20 is turned ONL to provide low heat generation, and at the same time,
The LED 47 is lit to indicate that the heater is energized.

Next, in step 5112, the starter switch 4
1 is 0FFL, determine whether or not, and turn the starter switch 4
1 is not 0FFu, return to step 5201 and continue to turn on the starter motor relay 44, heater power-on relay 48, and LED 47. If the starter switch 41 is turned off, return to step 5201 above.
The process advances from step 112 to step 5202.

In step 5202, the starter motor relay 44
and heater power-on relay 48 is turned OFF, starter motor 45 and heater 20 are set to 0FFb, and the above-mentioned LE
D47 is turned off, the heating display is stopped, and the program is ended.

On the other hand, if it is determined in step 110 that WS < W, the process proceeds from step 5i1o to step 5114, increments the count value C of the counter by 1, and then steps 520
3, the heater power-on relay 48 and the heater heat generation amount adjustment relay 49 are turned on, and the heater 20 is set to have a large heat generation amount. Further, the LED 47 is turned on to indicate that the heater is being energized.

Next, in step 5116, it is determined whether the count value C of the counter has reached the set value Cm, and if C<Cm,
Return to step 5114 above, continue counting, and
In the case of 0 m, that is, when a predetermined time (for example, 3 SEC) has elapsed, the process advances to step 5117.

In step 5117, the count value C is cleared (CmO
), proceed to step 5204, turn on the heater power-on relay 48 and heater heat generation adjustment relay 49, turn off the LED 47 and stop the heater heating display, proceed to step 5119, and repeat the same procedure. Then, the starter motor 45 is driven and the program is ended.

Note that the present invention is not limited to the embodiments, and more precise control may be performed using three or more heaters. By providing a heater for each, M
It can be applied to a Pf type engine, and furthermore, it can be applied to an electronically controlled carburetor type engine.

[Effects of the Invention] As explained above, according to the present invention, when the startability determining means determines that the engine cannot be started, the required heat generation Q of the heating means that promotes fuel vaporization to enable starting is Since the necessary calorific value calculation means appropriately calculates the required calorific value based on the engine temperature and the alcohol concentration of the fuel, unnecessary power consumption by the heating means is eliminated and energy wastage can be prevented.

Moreover, the required calorific value is compared with a predetermined reference value by the start control means, and when the required calorific value is larger than the reference value, the heating means is driven for a predetermined time, and then,
Since the starter motor is driven, even if the heating means consumes a large amount of power to generate the necessary amount of heat, it is possible to start without increasing the battery capacity. The effect is produced.

[Brief explanation of drawings]

1 to 5 show a first embodiment of the present invention, FIG. 1 is a functional block diagram of a control device, FIG. 2 is a schematic diagram of an engine control system, and FIG. 3 is a startable II + constant map diagram. 4 is an explanatory diagram of the fuel injection 1m map at startup, FIG. 5 is a flowchart showing the control procedure at startup, and FIG. 6 and the following diagrams show the second embodiment of the present invention. FIG. 7 is a schematic diagram of the engine control system, and FIG. 8 is a flowchart showing the control procedure at startup. 20.23.24...Heating means 53...Startability determining means 56...Required calorific value calculation means 57.62...Starting control means A...Alcohol concentration TW...Cooling water temperature (engine Temperature) W... Necessary calorific value WS... Voluntary writing of standard value procedure correction) 1. Display of the incident 1999 Patent Application No. 208050 Name of the invention Person who corrects starting assist device for alcohol engine Relationship with discord

Claims (1)

[Claims] Startability determining means for determining whether or not the engine can be started based on the alcohol concentration of the fuel and the engine temperature; and when the startability determining means determines that the engine cannot be started, vaporizing the fuel. a necessary calorific value calculation means for calculating the required calorific value of the heating means to facilitate start-up based on alcohol concentration and engine temperature; and a necessary calorific value calculated by the necessary calorific value calculation means and a predetermined reference value. and starting control means for energizing the heating means for a predetermined time and then driving a starter motor when the required calorific value is larger than the reference value. Auxiliary equipment.