Ignition coil with integrated coil driver and ionization detection circuitry
First Claim
1. An ignition coil with integrated coil driver and ionization detection circuitry, comprising:
- an ignition coil having a primary winding and a secondary winding;
an ignition plug operably connected between a second end of said second winding and ground;
a coil driver circuit operably connected to said primary winding of said ignition coil and mounted on said ignition coil; and
an ionization detection circuit operably connected to said secondary winding of said ignition coil and mounted on said ignition coil, wherein said ionization detection circuit comprises;
a capacitor having a first end operably connected to a first end of a diode, wherein a second end of said diode is operably connected to a second end of said primary winding; and
a current mirror having a first terminal operably connected to a first end of said secondary winding and a second terminal operably connected to said first end of said capacitor.
12 Assignments
0 Petitions
Accused Products
Abstract
Internal combustion engine (ICE) on-plug ignition coils with transistor drivers located in powertrain control modules (PCM) or other remote locations are prone to high electrical and magnetic interference (EMI) emissions and are subject to interference from other components due to long connecting wires. Ionization detection circuits have even greater sensitivity to EMI because of their very low signal current levels (mioroampere). The present feature of the invention integrates both the coil driver transistor and ionization detection circuits into the on-plug ignition coil. By placing the circuit on top or on the side of the coil, the connection distance from the circuit to the secondary winding is minimized. Thus, the circuit is less susceptible to electrical and electromagnetic noise.
56 Citations
12 Claims
-
1. An ignition coil with integrated coil driver and ionization detection circuitry, comprising:
-
an ignition coil having a primary winding and a secondary winding;
an ignition plug operably connected between a second end of said second winding and ground;
a coil driver circuit operably connected to said primary winding of said ignition coil and mounted on said ignition coil; and
an ionization detection circuit operably connected to said secondary winding of said ignition coil and mounted on said ignition coil, wherein said ionization detection circuit comprises;
a capacitor having a first end operably connected to a first end of a diode, wherein a second end of said diode is operably connected to a second end of said primary winding; and
a current mirror having a first terminal operably connected to a first end of said secondary winding and a second terminal operably connected to said first end of said capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. An ignition coil with integrated coil driver and ionization detection circuitry, comprising;
-
an ignition coil having a primary winding and a secondary winding;
an ignition plug operably connected between a second end of said secondary winding and ground;
a coil driver circuit operably connected to said primary winding of said ignition coil and mounted on said ignition coil; and
an ionization detection circuit operably connected to said secondary winding of said ignition coil and mounted on said ignition coil, wherein said ionization detection circuit comprises;
a charge pump having a first end operably connected to a DC voltage; and
a current mirror having a first terminal operably connected to a second end of said secondary winding and a second terminal operably connected to said charge pump. - View Dependent Claims (11)
-
-
12. An ignition coil with integrated coil driver and ionization detection circuitry, comprising:
-
an ignition coil having a primary winding and a secondary winding;
an ignition plug operably connected between a second end of said secondary winding and ground;
a coil driver circuit operably connected to said primary winding of a said ignition coil and mounted on said ignition coil; and
an ionization detection circuit operably connected to said secondary winding of said ignition coil and mounted on said ignition coil, wherein said coil driver circuit further comprises a switch operably connected between a second end of said primary coil and a first end of a current feedback resistor and wherein a second end of said current feedback resistor is operably connected to ground potential.
-
Specification