WO1991011613A1

WO1991011613A1 - An ignition digital control system with ignition spark security

Info

Publication number: WO1991011613A1
Application number: PCT/IT1990/000094
Authority: WO
Inventors: Astorre Biondi; Massimo Casoni
Original assignee: Ducati Energia S.P.A.
Priority date: 1990-01-24
Filing date: 1990-11-19
Publication date: 1991-08-08
Also published as: AU6757190A; IT9083310A0; IT9083310A1; IT1238976B

Abstract

Ignition digital control system for I.C. motors and respective I.C. motor or vehicle that incorporates it of the type comprising preferably: one or more phase sensors (2) in relation to a determined angular position of the shaft motors (1); eventual other sensors (temperature, pressure, etc.) depending on the functions of the system; ignition group (high tension bobbin, power circuit 5); eventual other servocontrol and pilotage circuits (solenoid valves); at least one elaboration board and/or electronic control comprising a sequential logic device (4); at least a magneto-generator or batteries (1); characterized in that said angular position sensors (2) are structured in order to send to said elaboration board and/or control board, an additional signal (SS) to the normal signal destined to the electronic elaboration (SC), in phase condition, or lightly retarded if compared to the maximum retard point of the anticipation curve of the motor, to generate the command of a second spark discharge in the ignition system bypassing the electronic elaboration circuital system (3, 4).

Description

An ignition digital control system with ignition spark security

The present invention concerns an ignition system with variable anticipation for digital control IC-motors with spark security device. The endowed I.C. motors of such ignition system is also an object of the present invention. The eventual vehicle that incorporate the motor with said device is also an object of the present invention.

The invention is utilized in two stroke motors for motorvehicles with two or three wheels as motorcycles, mopeds and scooters, however the system can be utilized for other motorvehicles.

Actually the digital systems that equip the motor vehicles comprise: 1 ) one or more phase sensors (angular position of the motor shaft); 2) other sensors (e.g. temperature, pressure,etc,) depending of the functions of the system; 3) starting group (H.T. bobbin power circuit); 4) other servocontrols and relative pilotage circuits (soienoidvalves); 5) an electronic board comprising a sequential logic device, (uP, uC) and other electronic parts; 6) magneto-generators, or batteries.

The devices in points 1 , 3, 5 and 6 shall however always be present in an ignition system with variable anticipation.

By the phase sensor (uP) contained in the electronic board we obtain, besides the phase, even "the rotation regime of the motor.

The electronic board and the CPU Elaborates these and eventual other variables and on the grounds of the exigencies of the motor gives the command of starting sparks at the opportune moment.

This system generally contains a component with sequential logic or however contains a certain set of electrically alterable registers from which the system can derive reference data.

In forceful presence troubles (e.g. thunderbolts in the proximity of the vehicle, H.T. generators or sparking products from false contacts of the wiring) that often can be generated by the sparks of the same motors, such electronic components can lose the synchronism, deranging completely the sequence of the operations and electronic commands or even modify solely the contained data in the reference registers.

However both the component in problem do not assure regular fonctionnement and all the system manifest the same problems.

In the majority of the cases such problems consist in the immediate disappearing of spark.

Such phenomenon is always irreversible, consequently to obviate the problems the circuit is equipped of a control stage (said in jargon of "Watchdog") which provides to reset after a certain time, the actuation of the disturbed circuit. During this time however no spark reaches the motor, for which the power collapses brusquely. And if the trouble source is persistent, a continued series of interventions of the "watchdog" can even stop the motor for sparking lack.

It is easily imaginable as happening such conditions the trouble and danger for example during the accomplishment of an overtaking with such a vehicle, or in dynamic equilibrium conditions during the planning of a curve with a high speed motorcycle.

Remedy solutions of disclosed matter provide a double independent ignition system even with double ignition plugs in the combustion chambers, but this solution is expensive and not always feasible.

Scope of the present invention is to obviate to the mentioned drawbacks without substantial increment of the production costs.

This and other scopes are reached with the present invention as claimed, by means of an ignition digital control system for I.C. motors and respective I.C. motor or vehicle that incorporates it of the type comprising preferably: • one or more phase sensors in relation to a determined angular position of the shaft motors; • eventual other sensors (temperature, pressure, etc,) depending of the functions of the system; • Ignition group (high tension bobbin, power circuit); • eventual other servocontrol and pilotage circuits (solenoidvalves); - at least one elaboration board and/or electronic control comprising a sequential logic device ; - at least a magneto-generator or batteries; characterized in that said angular position sensors are structured in order to send to said elaboration board and/or control board, an additional signal to the normal signal destined to the electronic elaboration, in phase condition, or lightly retarded if compared to the* maximum retard point of the anticipation curve of the motor, to generate the command of a second discharge of the spark in the ignition system bypassing the electronic circuital system of elaboration.

In this way even if the sequential logic device loses the synchronism and the electronic system does not discharge the signal that determines the normal correct discharge of the spark in the established point, the additional signal (generally immediately successive) allows the motor to operate regularly even if not in its maximum performance. This until the reset of the regular actuation of the sequential logic digital device, after which an eventual second spark, not proud in relevant mode the actuation of the motor.

Advantageously the circuital system downwards of the sequential logic system can provide a suppressor of the second signal to avoid useless energy absorptions. These second signal suppressor means having the possibility to be of any kind and even electronic cycle count of a first and second considering solely valid the first one and not the second.

The invention can be better understood with the joined description and drawings supplied for example only, in which: Figure 1 represents one of the phase curve in function of the turns number (but can be even other the variable that influence such curve). Figure 2 represents one utilization block-schema according to the present invention. Figure 3 represents the operative diagram and the behavior diagram as per blocks schema of Figure 2. The phase of the additional signal (PMR signal) according to the invention shall coincide with an equal value to a security line as indicated in Figure 1 being for the respective curve in abscissa the respective anticipation value, or under it (this depending of the exigencies of the motor). In correspondence of such signal a discharge command shall always start. That is to say the same signal to provoke the discharge or to intervene on any input (asynchronous) of the device with sequential logic (which entrusts to prime itself the discharge), on the security line or in an established point under it, always allows a "security discharge command".

The practic solutions to realize a system of this type can be different. One simple solution can be the blocks schema represented in figure 1 , where : 1 refers to the rotor of the energy generator operated by the motor-shaft ; 2 refers to the angular position sensor with additional signal (PMR) known as "PICK UP" according to present invention; 3 refers to a square filter, 4 refers to the digital system with elaboration sequential logic and/or control (CPU) and 5 refers to the true ignition group and own with respective electronic circuit, high bobbin voltage and respective ignition plug. In the circuit are furthermore provided for a good actuation two respective control diodes respectively of the "PickUp-ignition" 6, and of the "CPU- ignition" 7.

In Figure 3 are reported the present signals in the different discharged points of the respectively system: In the point "A" exit Tick Up"; In the point "B" between the filter square 3 and the digital system 4; in the point "C" to the input position of the ignition group 5; 1 In the point "D" between the "CPU" 4 and the diode 7. ?

3 In the signals of Figure 3 the values "SC" and "SS" indicate respectively in

4 logic succession

5 ♦ the first which first exit signal from the "PickUp" 2 that goes to the

6 elaboration in the digital system "CPU" to allow operating regularly and

7 optimally the motor and

8 • the second 6 which second exit signal by the PickUp 2 that, besides with be

9 elaborated by the digital system (CPU), goes to generate directly the spark 0 bypass elaboration the (CPU) via the diode 6, becoming so security signal 1 according to present invention, that operate however even if the electronic 2 board (CPU) is damaged by any event. 3 4 We'll note that the first happens during the signal of negative wave (on) and 5 the second during the signal of positive wave (op) but could be even lightly 6 displaced provided that within the limits over expressed. 7 8 The signal for the digital device (B) protracts in the time (starts from the 9 round angle depending from the angular rotation angle β). 0 SI indicates the discharging moment of the spark according to digital system, 1 while PS indicates the instant in which a trouble makes lose synchronism to 2 the (CPU) device. In the successive turn the signal (D) of discharge command 3 is not therefore present, so such command is received in the instant (SS) by 4 the security discharge signal (SS). 5 6 Advantageously at the exit of discharge command of the (CPU) digital system a 7 shunt circuit (e.g. a serial capacity not illustrated) can be present. 8 . This for the scope to obtain a starting ignition sensible not to the level in exit 9 from the (CPU), but to the front of the signal. A contrivance of this type avoids that the memorized logic state in exit of the digital device before that loses the synchronism, can maintain always excited the starting discharge device. This situation could in fact vanish the effect of the line security signal.

Consequently we can appreciate that the invention regards an ignition system with variable anticipation and eventually concerned parameter management the actuation of the motor that provides to give in any operative condition, an additional security spark command. This is made in order to always have a spark command (SS) even in leakage synchronism case of the digital device with logic sequential (CPU 4), caused by electromagnetic troubles or other.

The important is that such spark happens on command more or less direct of an external phase reference to the digital system 4. The phase with which intervenes the spark security command can obviously coincide or can be retarded if compared to the maximum phase provided retard for the regular actuation.

Important is even the fact that the discharge command signal in exit of the digital elaboration device can be derived, to the scope to obtain a sensibility to the front and not to the level of the same signal.

Claims

' CLAIMS 1 An ignition digital control system for I.C. motors and respective I.C. motor or vehicle that incorporates it of the type comprising preferably: • one or more phase sensors (2) in relation to a determined angular position of the shaft motors (1); • eventual other sensors (temperature, pressure, etc,) depending of the functions of the system; • Ignition group (high tension bobbin, power circuit 5); • eventual other servocontrol and pilotage circuits (solenoidvalves); ' at least one elaboration board and/or electronic control comprising a sequential logic device (4); - at least a magneto-generator or batteries (1 ); characterized in that said angular position sensors (2) are structured in order to send to said elaboration board and/or control board, an additional signal (SS) to the normal signal destined to the electronic elaboration (SC), in phase condition, or lightly retarded if compared to the maximum retard point of the anticipation curve of the motor, to generate the command of a second discharge of the spark in the ignition system bypassing the electronic circuital system of dta elaboration (3-4).

2 A motor ignition system, a motor with said system and vehicle with said motor, according to claim 1 , characterized in that in the respective ignition circuital system downwards of the elaboration system control (CPU 4) and upwards of the respective spark discharge plug, has suppressor means for any cycle of the second spark signal. ^• 3 An ignition system, a motor with said system and vehicle with said motor, according to claim 1 , characterized in that: ' the ignition circuital system (5) downwards of the elaboration system control (CPU 4) and upwards of the respective spark discharge plug, ha? suppressor means for any cycle of the second spark signal: • said suppressor means being means that allow the determination circuit o. the spark (5) to operate solely to a sole first signal for any cycle, ignoring the second, in order to, when the first lacks, the second is considered as first .