Jane/Projects/MC IC-Ignitor Research

This is research on the "IC-Ignitor" for mid-80s' motorcycles. The target platform is a 1985 Honda CB650SC. Which is a 655cc 16-V DOHC I4 with individual carburetors. The ignition system is fully electronic, TCI, with two ignition coils (wasted spark). The CPS(Crank Position Sensor) is a "pulse generator" setup. It utilizes two "pickup" coils. The output signal is Variable Reluctance(VR). There is a single "wiper" attached to the crank. Each sensor will be pulsed once per 360° of rotation. The first sensor is pulsed at #1&3 TDC. The second sensor is pulsed at #2&4 TDC.

See Also

• CB650SC/Specifications#Ignition System

Crank Angle Sensor

Photos

"Pulse Generator" on 1985 CB650SC

VR-Variable Reluctance

Illustrations

Honda I4 TCI early dual sense

Honda Schmitt Trigger Circuit Example

Honda Schmitt Trigger Waveforms

Resources

General

• https://archive.org/details/motorcycleelectr0000tran/
• https://forum.arduino.cc/t/sensing-engine-rpm-via-coil/10284/3
• http://www.bgsoflex.com/v22/msv22.html
• http://www.megamanual.com/ms2/pcb.htm
• https://www.bgsoflex.com/v22/megasquirt_ShemV2.2.pdf
• https://avionicsduino.com/index.php/en/variable-reluctance-sensors-and-signal-conditioning/
• https://mcs.woodward.com/content/motohawk/Documentation/MotoHawk2015bSP0/HTML/MotoHawk_topics/VRInterfacing.html
• https://github.com/rusefi/rusefi/wiki/Trigger-Configuration-Guide

VR Conditioner

• https://wiki.speeduino.com/en/boards/VR_conditioner
• http://jbperf.com/dual_VR/v2_1.html
• https://www.diyautotune.com/support/technical-articles/other/megasquirt-vr/
• https://openlogicefi.com/shop/p/duel-vr-conditioner-detonationems
• https://github.com/speeduino/Hardware/tree/main/VR%20Conditioner/Latest
• https://www.tindie.com/products/techcolab/max9926-dual-vr-conditioner-optional-regulator/
• https://diy-efi.co.uk/product/vr_conditioner
• https://wtmtronics.com/product/dsc-dual-signal-conditioner-vr/

Patents

• https://worldwide.espacenet.com/patent/search/family/015406861/publication/JPS5572654A
• https://patents.google.com/patent/US4499544A/en
• https://worldwide.espacenet.com/patent/search/family/014564227/publication/JPS63277861A
• https://patents.google.com/patent/US3641377A/en
• https://worldwide.espacenet.com/patent/search/family/015411755/publication/JPS5270245A
• https://worldwide.espacenet.com/patent/search/family/011532315/publication/JPS5949426B2
• https://patents.google.com/patent/JPS5285645A/en

Timing

OEM

Advance Table

RPM	Degrees Advance
At idle min-1	10 BTDC
Full advance/min-1	32 BTDC/3000